The bolts on this sight use the standard thread pitch per size. It screws directly into the frame or fork, so the thru axle … Cycling component manufacturers sometimes use an “aerobic,” or “dry” threadlocker for their products, such as on brake caliper bolts. Both factional and metric sizes are in use. This assumes that enough undamaged thread is remaining to allow proper tightness. Use care when applying these compounds and follow the safety directions of the manufacturers. There are specific front axles and rear axles that come in different lengths and even have different thread pitches. But things like dropout design, thread pitch and the overall length of the axle differ between makes, even with the same axle spacing, so thru-axles … Thread Length: The length of the axle’s threaded portion. In another example, the tap drill size for a 9/16-inch x 20 tpi thread would be: 0.5625 - 0.05 = 0.5125 inch. Size of the axle is 142 x 12 mm. Cutter Selection Guide for Reaming, Tapping & Facing View Article, Torque Specifications and Concepts View Article, Bottom Bracket Tapping, Threading, Chasing, and Facing View Article, © 2015–2021 Park Tool Co. — Privacy Policy | Terms of Use | Do Not Sell My Info | Patents and Trademarks | Park Tool Trimmer | Park Tool Motorcycle. Updated: 09/09/2020. However, with thru-axles the drop-outs are closed loop. Even liquid threadlockers provide some lubrication during tightening. Rick's Bike Shop 368 Ridge Road Queensbury, NY, 12804 (518) 793-8986 You can use a caliper to measure this. Thru Axle thread pitch must match exactly. There are also options that include an open dropout on one end, so you don’t need to completely remove the thru-axle to release the wheel from the frame. Most every modern disc brake road, cyclocross and gravel bike uses a 12×100 front hub standard, and a 12x142mm rear hub standard. Another critical aspect of thread fit and interchangeability is call pitch diameter. 168mm length with 12 mm thread length; Used by Santa Cruz and Scott. Below is a table of some of the threads and their uses. The bottom bracket shell inside diameter should be 35mm to correctly cut threads of 36mm. However, threadlockers should not be used to replace proper torque and pre-load when clamping load is important. Approximately 7 threads is P1.5mm, and just under 6 is P1.75. Pitch diameter is difficult to measure directly without special instruments such as the optical comparator. You can unsubscribe at any time. 5.0 out of 5 stars 1. You can find a spattering of Super Boost wheels from many brands, but there’s a limited number of Super Boost bikes out there. But you can still find lower-priced MTBs running on quick release hubs or non-Boost thru-axles. Thread pitch is the distance from the tip of one thread to the tip of the next thread in milimeters. (Double check – did you print the guide to actual size?) A thread is a continuous helical ridge formed on the inside (nut) or outside (screw) of a cylinder. Because the right pedal has normal threads and the left pedal, reverse threads, turn the pedal axle in the direction of pedaling to install. For mid-range and higher spec XC, trail and enduro bikes, thru-axles with Boost spacing are now the norm. For threads to interchange and match, both the diameter and pitch must match. Front wheels will typically use a 100mm or 110mm length, while rear wheels will use a 135, 142, or 148mm length. M5=0.8 thread pitch Front wheels will typically use a 100mm or 110mm length, while rear wheels will use a 135, 142, or 148mm length. Common thru axle thread pitches include 1 mm, 1.5 mm and 1.75 mm. This play is normal and disappears when the fastener is tightened. There are specific front axles and rear axles that come in different lengths and even have different thread pitches. Threadlockers come in different grades of strength. Choosing the right thru-axle adapter for your bike is based on hub spacing and the thread pitch on your existing bike. Thread sizes are given in nominal sizes, not in the actual measurement. RockShox Maxle Lite Front MTB, 15x110, Length 158mm, Thread Length 9mm, Thread Pitch M15x1.50 Boost Compatible - SID, Reba. The thread forms a “V” shape between crests. Like many things bike, axle standards seem to be subject to constant change, with new ones emerging, gaining traction, then sometimes falling by the wayside as tech trends moves on. Thread pitch is the distance from the tip of one thread to the tip of the next thread in milimeters. If only minor damage has occurred, it may be possible to re-tap the thread. Notice the relatively coarser threads are deeper as compared to the fine threads. The inserted coil has the outside diameter of the tap, but the coil inside diameter matches the original thread. This hardening and expansion is what gives these materials their special feature. This compound acts primarily as thread filler. Additionally, use care when applying compounds in suspension shocks. As 2011 bikes start to show up there's been some noise made about the new 12 x 142 mm rear axle spacing that many seem to be sporting, even the short travel XC bikes! See related article: Torque Specifications and Concepts. Generally, a fine pitch is easier to tighten in that tension is achieved at lower torques. And how do you find the right pitch for your bicycle frame? Understanding basic concepts regarding fasteners and threads will improve the skill and knowledge of any mechanic. The SAE (Society of Automotive Engineers) system rates bolts from grade 1 through grade 8. This ridge is called the crest. Some thru-axles have a lever built into them to tighten or undo them, others you need to tighten with an Allen key. Axle length, diameter, thread length, thread pitch, the interface between the axle and the dropouts and whether the securing thread is part of the frame or a separate nut that comes with the axle make this a ridiculously complicated component to replace or upgrade. Place your axle threads on top of the Fitment Guide to find the matching thread pitch. Larger tap sizes are generally made as “skip toothed” taps, with every other thread missing. 157mm spacing is also the standard for the rear wheel on downhill bikes. With QR axles you mount the axle on U-shaped drop-outs and then tighten them to keep them in place. This kit consists of an axle, washers, and end caps with bolts for use with CycleOps Classic or Pro Series trainers. Notice that the coarser the thread, greater the difference between tap drill size and tap size. Stock thru axles are not able to accommodate any sort of axle mounted hitch system. Trainer thru axle adapter for CycleOps Trainers. Cannondale tackles the drive for increased wheel rigidity and greater tyre clearance differently with its Asymmetric Integration, or Ai, geometry, found on bikes like the Scalpel. A “split lockwasher” applies a mild push to nut and bolt as it is compressed, which in theory helps hold the fastener. This can take for form of liquid lubrication, grease, or an anti-seize compound. Traditionally, frames and forks had slotted dropouts, which are open at the ends. Determine if it is a 1.0, 1.5, or 1.75 thread pitch. But the hub geometry is slightly different to Super Boost, with different brake rotor placement, so they’re not the same thing. An axle has to be longer than the hub to fit in the frame. Thru Axles provide the key benefits of; increased clamping force, and improved stiffness of frame/fork structures by acting as partial stress members.While most frame and fork manufactures have … The thru axles are for 12mm x 142 , 148 , 197 hub spacing. There are situations, however, where a manufacturer may recommend no lubrication on the fastener. The thread forms a “V” shape between crests. ISO standard defines dimensions of thread – by diameter and pitch. Axles come in BOTH thread pitches … At present, there’s no drive to go wider. They are usually not intended for use with plastic, and may both harden and weaken the plastic. I haven't see a bike with 1.75 but Kurt Kinetic sells that pitch for their traxle so someone must use it. Use the table below to find the axle you need. CyclingDeal Compatible with Shimano Trainer Thru Axle - Bike Bicycle 12mm Rear Wheel Skewer for Indoor - Length 166mm to 178mm -Thread Pitch: M12 x P1.5-2.5mm/6mm/tapered 7.5mm Spacers 5.0 out of 5 stars 1 That means that there’s greater tension on the spokes on the cassette side of the wheel, which lowers rigidity, and is more likely to lead to failure. With the rear brake engaged or the wheel resting on the ground, the chain prevents the cranks from turning. Even when threads are properly sized, there will be play or slop between external and internal threads when engaged. But things like dropout design, thread pitch and the overall length of the axle differ between makes, even with the same axle spacing, so thru-axles are not always cross-compatible between brands. Trek does not sell, trade, or rent your personal data to third parties. Ai requires a specially dished rear wheel. The tool-free Maxle Lite Front brings exceptional stiffness and durability to your ride in a light, easiest-to-use expanding wedge thru axle system. Washers are often used with threaded fastener. Note: The wrench size for the head of the bolt or nut is not used to determine the size of the thread. Axle length, diameter, thread length, thread pitch, the interface between the axle and the dropouts and whether the securing thread is part of the frame or a separate nut that comes with the axle make this a ridiculously complicated component to replace or upgrade. The aim is again to increase rear wheel bracing angles and rigidity and Super Boost can also allow a frame to be designed with increased tyre clearance. Super Boost goes one step wider at the rear, increasing the axle width to 157mm. Santa Cruz models come OEM with a DT However, a replacement bottom bracket of a different brand may fit the same bike tightly. For example, liquid compound applied to the bolt for a cantilever brake boss may end up in the brake arm pivot. These are available in both SAE (“English”) and metric thread pitches. RockShox Maxle Ultimate Rear MTB, 12x197, Length 229mm, Thread Length 20mm, Thread Pitch M12x1.50 - Fat Bike Custom The tool-free Maxle Ultimate Rear brings exceptional stiffness and durability to your ride in a high clamping force, easiest-to-use internal cam thru … read more 12 mm 229 mm 1.5 197 mm RockShox 00.4318.005.015 Ships Free Threadlockers are special adhesives used in many industries and in many applications. The washer distributes the pressure on the aluminum arm, and allows the bolt to tighten fully. $16.99. Cannondale also uses Ai on its SuperX cyclocross bike for its improved tyre clearance. You push the bike axle through round holes then thread it into one side of the drop-outs. Taps and dies are cut to match the desired thread, and also have a helix angle. There are a number of variables you’ll need to determine: thread pitch, length of axle and thread length. In this example, 15mm is the diameter, 100mm is the O.L.D., 127mm is the overall length and 1.5mm is the thread pitch. The axle is held in place by a 5mm diameter quick-release skewer that slides through the hole in the axle. This tool acts as a “straight die,” and will trim metal from flattened threads. Common thru axle thread pitches include 1 mm, 1.5 mm and 1.75 mm. An all-around bike mechanic should be up to speed on these bikes.. It is likely the two bottom brackets vary in pitch diameter. The various grades and types of compounds will vary with their ability to perform at high temperatures, heavy loads, chemical exposure, and stress. Washers, Locking washers, and Safety Wire, Dropout adjustment screws, some derailleur hardware, accessory hardware, Some derailleur limit screws (DIN standard), Common derailleur limit screw (JIS standard), Many uses on bicycles, including derailleur wire pinch bolts/nuts, disc rotor mounting bolts, fender and racks mounts, water bottle cage bolts, and others, Many uses on bicycles, including brake caliper mounting bolts, brake pad bolts/nuts, some fender racks, some brake adjusting barrels, Front hubs, solid axle, less expensive bikes, Square-type crank bolts, front solid axle hubs, suspension system hardware, Stem hardware, stud type crank nuts, suspension hardware, Front hubs, quick-release, Asian manufacturer, Some solid axle bike, including coaster brake, Most quick-release rear axles, derailleur mounting bolts, brake lever adjusting barrels, Bottom brackets, ISO/English/BSC, and threaded freewheel hubs, Bottom brackets, older “Raleigh” three speeds. Measure the thread pitch of your axle. He was into gravel before it was even invented, riding a cyclocross bike across the South Downs and along muddy paths through the Chilterns. However, lockwashers add nothing in terms of “holding power” to a joint that is fully tightened. If it does not strip, the thread is adequate, and should survive the use. The rear wheel is 10mm in diameter and 135mm wide. If is useful to lubricate the threads and under the head of the bolt, especially when the bolt head is turned during tightening. 99. Bicycle Fabrication Supply offerings of rear thru axles for our rear dropouts. Left-hand threads on bicycles are seen on the drive side of bottom bracket and the left pedal. A fine thread will have less depth as compared to a coarse thread, and consequently are easier to strip. In a fractional size, this is nominally 33/64-inch. Trying to get an axle for my trainer but it asks for thread pitch: 1.00, 1.75, or 1.5. This axle has a 1.5 mm thread pitch. If the hole is too large, the tap will cut with little problem, but the internal thread will not be the correct size for the bolt/screw, and failure during tightening or use is very likely. Tools most commonly used for (un)screwing the bolts and nuts of the given standards will also be noted (also by ISO standard), for both allen (hex) and … This is more difficult to see because the threads are not continuous around the tap or die. The use of chemical threadlockers will also be discussed. However, the stress and loads experienced on the bicycle are less than the automotive uses these compounds are designed for. The chainline needs to be engineered to run efficiently too, which means moving the chainset and cassette ever-further outboard as axle width increases. The commonly available threadlockers are called “anaerobic.” These liquids cure independent of air, and will harden and expand. Our guide is here to help…. Each threadlocker manufacturer publishes recommendations for their particular thread-locking product. Thread pitch: Thread standard used on the axle, expressed as distance between threads in millimeters. This article will discuss the basics of threaded fasteners and fastener tightening. Between each crest is a space, called the root. Tapping a derailleur hanger using a TAP-10 and TH-2. There is also a 1.75 pitch out there. There are compounds that are stronger and extra procedures are often necessary when disassembling, such as heating with a heat air-gun. Because of this, it is common to prepare the threads with lubrication. In the image below, two bolts of the same diameter are magnified using an optical comparator. If the thread is very poorly tightened, a lockwasher may help in further loosening. 3/8 is the diameter of the axle and the "-16" or -24" is the number of threads per inch... this is called thread pitch. Already have an account with us? The original thread inside diameter is approximately 34mm. With Ai, the driveside chainstay spreads out from the bottom bracket more than the non-driveside by 6mm. A wider axle means that the flanges on each side of the hub can be set further apart, increasing their bracing angle and, hence, the wheel’s strength. Other parts may be inadvertently contaminated. Manuals on machining contain tables and charts to determine the correct tap drill size. For external threads (bolts), a right-hand thread slopes up to the right, but the internal right-hand thread slopes up to the left. Most screw threads used on a bicycle use a 60-degree thread angle. It is also common to use “M” before the bolt size, such as M6 for a 6mm bolt. Are you baffled by the different axle options available for mountain bikes? Most screw threads used on a bicycle use a 60-degree thread angle. Some older front axles were 9mm or even 8mm, and they bend easily. 3/8 is the diameter of the axle and the "-16" or -24" is the number of threads per inch... this is called thread pitch. Just under 6 threads is P1.75. Get it as soon as Mon, Feb 22. It is also very hard on the taps. But those are fairly obvious. To find the pitch, you need to count the number of threads over a 10mm section. Metric bolts come with a “property class,” a two number system separated by a decimal point. Threads are designated or named by the external thread major diameter and a pitch measurement. Total Length: The length of the axle, not including the head. This may be a little late to help you bods (I've just joined) but I'm trying to rebuild an old bicycle, about 1905, and it has a front axle with a 9.5mm x 1mm pitch thread. A bike with 100% anti-dive at the front and 100% anti-rise at the rear would still pitch forwards under braking, because application of the brake at one end of the bike would increase or reduce the normal tyre load at the other end of the bike. Taps and dies can cut threads. When a thread becomes damaged, there are sometimes options for repair. Thread may also be cut using a lathe, or they may be rolled, such as threads on a spoke end, or on hub axles. This means the hub flanges can be set wider apart to increase the lateral stiffness of the wheel, but it makes Boost incompatible with all the older standards. The axle is threaded on both sides to fit Syntace and Maxle/ABP style thru axle systems. The pre-load of a fully tightened bolt far exceeds the stress added by a lockwasher. CyclingDeal Compatible with Shimano Trainer Thru Axle - Bike Bicycle 12mm Rear Wheel Skewer for Indoor - Length 160mm to 172mm - Thread Pitch: M12 x P1.5-2.5mm/6mm/tapered 7.5mm Spacers. Some resistance comes from friction and rubbing between the internal and external thread surfaces. Most thru-axles are described by four measurements, and you might see them described something like this: 15 x 100mm, 127 length, 1.5. Burley’s official adapter for bikes with a 12mm thru axle. A coarse thread has a relatively larger pitch measurement, and the threads will be further apart. Quick-release axles are hollow tubes that slot into the drop outs. Screw Pitch Gauges; Cycle Tools; Show All Types; Lubrication & Adhesives. An example of an SAE thread is 9/16″ x 20 TPI (pedal threads). Now here's the tricky part. The retaining compounds tend to have a higher viscosity than the thread-locking compounds. Recoil® and Helicoil® Companies supply a tap, coil inserts, and coil driver. Finer threads would have less of a difference between the tap and hole size. The tensile strength increases with the number. There is resistance to turning the bolt, as the fastener gets tighter. The correct size hole in this example would be0.25 -.05 = 0.20-inch, or a 13/64-inch drill bit. As the parts are threaded together, the excess compounds backs up toward the head of the thread where it spreads about. In fact, I have a bike with this pitch. A thru-axle leads to a much more secure connection between the wheel and the bike than a quick release; there’s no chance of it slipping out under load and it’s more rigid. There is a rating system that is used to mark and identify most industrial bolts. In a die, the cutting area is referred to as the “lands.” The lands are separated by “flutes,” the gap between the lands. As a practical test, after tapping the thread, slightly over-torque from the recommended specification. Thread Pitch. Some threads are also used almost exclusively in the bicycle industry. The Switch Thru axle is available in most common lengths. Super Boost is the latest thing and downhill bikes use wider spacing too. This is a useful technique to prevent damage from a bolt backing out and striking other machinery. Boost hubs use 15 x 110mm front and 12 x 148mm rear spacing. Rather than an open-ended dropout, bikes with thru-axles have a hole on each fork blade and at the seatstay-chainstay junctions. Some Italian manufacturers use threads with a metric diameter and SAE thread pitches. Trying to fit the bike on, it suddenly hit me that the bike has a thru-axle and the trainer has quick-release. The exact measurement is slightly below the named or nominal size. The Burley Thru Axle is a requirement for any axle mounted hitch system with a bike that has a 12mm thru axle. For example, the “Italian” bottom bracket thread standard is 36mm x 24 tpi, and some Italian made rear axles are 10mm x 26 tpi. The standard size for thru-axle forks on mountain bikes used to be 15mm x 100mm, with 20mm x 110mm used mainly on downhill and freeride bikes. But there are only a few thread pitches commonly used on bicycles, and so you can use bicycle parts themselves to check each other. However, the bicycle industry typically uses proprietary bolts without any markings. Axles do come in different lengths and diameters. They tend to be from smaller brands still, with Pivot being the first mainstream one to offer the standard. Most thread-locking compounds are designed for metals. Thx If it still spins freely it is the right thread pitch. Our guide below explains the common types of mountain bike thru-axles, as well as traditional quick-release axles. The bolts on this sight use the standard thread pitch per size. However, the spoke threading is larger (2.2mm) than the 2.0mm shaft. The tread pitch (M12X1.0) and hub spacing (142mm or 148mm) should be printed on your axle. Each thru axle is made to length and thread pitch for various dropouts we stock. Metric threading uses the direct pitch measurement in millimeters from thread crest to the adjacent thread crest measured along the thread axis. Nevertheless, there are a great number of them still on the road, because they were built to last, and they still come in for repair. The pitch diameter is the diameter of the thread at a point where the width across the thread and the width across the groove between threads, are equal. Anyone know how to find this out? and thread pitch/length. To allow space for the cassette, the wheel has to be dished asymmetrically, with the rim not centred over the hub. Fits: An list of known compatible forks or … So-called “English,” “Standard,” “Imperial,” or SAE threads are designated by the frequency of how many threads are counted along one inch. Fits: An list of known compatible forks or frames, by no means comprehensive. The right-hand screw tightens clockwise (to the right). Beyond that you need a cone wrench for the cone size and some kind of wrench that goes on the locknuts, and that's it for required tools. DT Swiss sells their RWS thru axles in 1.5 and 1.0 pitch. Both 148x12 Thru Axle Adapters are compatible for both 142 and 148mm bikes. It’s important that you get the right thread pitch so you don’t strip your axle or dropout. This allows the rear wheel to be built symmetrically, offering more rigidity – up to 60 per cent according to Cannondale’s claims. For example, a 6mm bolt may measure 5.8mm or 5.9mm, but it is called 6mm bolt. This is because the crest was displaced upwards when the threads were rolled. If you are unclear as to what type of thru axle your bike uses, please reach out to your local bike shop or the bicycle manufacturer directly. Wire is passed through the hole and routed so tension is maintained. But things like dropout design, thread pitch and the overall length of the axle differ between makes, even with the same axle spacing, so thru-axles are not always cross-compatible between brands. Meanwhile Cannondale has its Ai system, which addresses the same problem in a different way. Bolts and screws are made in different grades of strengths. Pitch is best measured using a thread pitch gauge. Alternatively, take the axle to a proper bike shop that can use their caliper and thread pitch gauge to let you know what axle thread it is in 10 seconds. This post provides a list of standards most commonly used on bicycles, with explanation of most common use. Fine thread. Subscribe today and get the next 3 issues of your favourite cycling magazine for just £5! Axles do come in different lengths and diameters. Threads are sometimes identified as “fine” or “coarse.” A fine thread will have a relatively small pitch measurement, and the threads will be closer together. You can see more details about these measurements below. A quarter of a turn on a derailleur screw advances the screw end only 0.19mm. So I am trying to figure out which axle to get from TACX to convert it. This is called “Threads per Inch”, and is abbreviated as “TPI”. (Double check – did you print the guide to actual size?) By entering your details, you are agreeing to BikeRadar terms and conditions and privacy policy. Determining the thread pitch can be difficult without a thread checker tool. Many retaining compounds require special technique for removal, such as excess force and or mild heat. So called “lockwashers” typically do not have a flat surface, but use a deformed or star shaped surface. There is a simple conversion for thread per inch into pitch. For trail, XC and enduro bikes that’s largely changed to the newer Boost thru-axle standard, which increases the front axle length to 110mm. New larger threads are installed with a specifically sized tap. 3/8" = 9.525 mm and 25.4 tpi is not far from 26 tpi. Measure the thread pitch of your axle. Another option for some external thread repair is a thread file. For example, a common spoke diameter is 2mm diameter. It’s important that you get the right thread pitch so you don’t strip your axle or dropout. A guide to mountain bike axle standards | Quick-release, thru-axles, Boost and more explained, Gravel bike setup: how to choose the right gearing, wheel size, tyres and more, SRAM acquires Time road and mountain bike pedal business, The complete guide to bottom bracket standards, A complete guide to rear derailleurs: everything you need to know, The ultimate guide to bike geometry and handling, What size mountain bike do I need? Place your axle threads on top of the Fitment Guide to find the matching thread pitch. To effectively service fasteners, it is important to have a working knowledge of screw threads. Thread pitch is the distance from the crest of one thread to another crest measured along the length of the thread. Plus the chainstays need to be splayed out more to fit a wider axle, which increases the risk of heel strike as you turn the pedals. Determining the thread pitch can be difficult without a thread checker tool. Greases; Hydraulic Oils; Agricultural Oils; Aerosols; Adhesives; O-Ring & Seal Lubricants; Grease Fittings; Grease Guns; Cleaning Products; Show All Types; Garden Parts & Accessories. The thread pitch is mostly based on the fork or frame. Derailleur adjusting screws are commonly a 0.75mm pitch. Sign in to manage your newsletter preferences. The angle of this “V” is called the thread angle, and is determined by fastener engineers. The major diameter is the outer diameter at the top of the thread crests. By submitting this form, you consent to sending the above information to Trek Bicycle, which will be stored in the United States. This is typically not an issue, but in some cases this is not appropriate. Thru axles vary in length, width, seat type (is the end cone-shaped or flat?) The washer distributes the stress around the bolted joint. Dies cut an external thread, such as a steering column. However, some thread standards will mix tpi with a metric diameter. The axle shaft and axle ends are precision CNC machined from 7075 aluminum, and hard anodized for … I too thought 'never heard of it', must be 3/8 x 26 cycle thread. Typically, if a thread has a pitch designated as TPI, it is a SAE thread and the diameter is given in fractional inch sizes.