Road Bike Axle Standards

15 x 100mm 127 length 1 5.

Road bike axle standards.

As of 2018 fatbikes and disk brakes have led to a several new axle length standards. Some bikes like trek s split pivot full suspension bikes use thru axles that are up to 50mm longer than the hub dropout width. 130mm old which means rim brakes can t stress this enough. Good old fashioned quick release.

130mm old rim brake only. Mountain bikes mostly use a 15x100mm front thru axle and you might still find a few road bikes that adopted that standard early on but 12 100 is more future proof for road. Shimano s 11spd road cassettes are just a little bit wider than their mountain bike cassettes. Let s review current axle standards.

For example i have disc cross road and xc bikes. 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. Road bike bottom bracket standards. The problem of disk brakes pulling the hub out of the front dropouts see james annan s article has been addressed with through axles which insert into a fork with a hole rather than a slot at the end of each blade.

How does this affect you the bike consumer. Not a single axle among them conforms to that envisioned future standards set. There are three common types of freehubs drivers. You ll still find inboard bearings on many budget bikes often with a solid square taper axle.

Boyd is probably right on his where are standards headed estimate. But this does build in constraints at both extremes of the. Everything you wanted to know but were afraid to ask. Most every modern disc brake road cyclocross and gravel bike uses a 12 100 front hub standard and a 12x142mm rear hub standard.

Some wheels and forks have swappable end caps or dropout inserts allowing for the use of either 12 or 15mm front thru axles. It is yet another axle standard to worry about. How to measure a bicycle thru axle most thru axles are described by four measurements and you might see them described something like this. But 142mm and 157mm soon superseded these standards with the extra 7mm allowing a stiffer interface with the frame.

Backward compatibility will continue to be necessary as frames and forks with other standards will linger for a long time. You can see more details about these measurements below. Hg stands for hyperglide. Driver vs free hub hg mtb vs hg 11spd road vs xd.