What size of axle is in a mountain bike?
Table of common mountain bike axle standards
| Name | Front axle (length × diameter) | Rear axle (length × diameter) |
|---|---|---|
| Quick-release | 100mm × 9mm | 135mm × 10mm |
| Non-Boost thru-axle | 100mm × 15/20mm | 142mm × 12mm |
| Boost thru-axle | 110mm × 15/20mm | 148 × 12mm |
| Superboost thru-axle | 110mm × 15/20mm | 157mm × 12mm |
What is the standard bike axle size?
Thankfully the bike industry is settling on a standard, with most manufacturers following Shimano’s lead — 12x100mm front thru-axles are becoming the norm and most rear ends now use 12x142mm axles.
What is axle diameter?
There is also often a sticker or a tag on your trailer axle that tells you the weight capacity of your axle which can also help determine size. Some common axle sizes are: Round, 1-3/4 inch diameter = 2,000-lb axle. Round, 2-3/8 inch diameter = 3,500-lb or 4,400-lb axle. Round, 3 inch diameter = 5,200-lb to 7,000-lb …
How do I know what size axle I need?
For a front thru-axle, this is measured from the inside to inside of your fork. For a rear thru-axle, this is measured from the inside to inside of your frame at the drop-outs. The O.L.D. measurement is listed for many thru-axles, but isn’t necessary if you know the overall length.
How do I know what size axle I need for my bike?
Measure the straight length of your axle shaft. Do not include the axle head or tapered spacer, if there is one. Axle length is not the same as hub length. A bike with a 12×142 hub standard will have a significantly longer axle since it will have to go through the frame on both sides of the 142mm wide hub.
How do I know my bikes axle size?
Can I convert skewer to thru axle?
You can use through bolts (which can be quick release) in QR dropouts. These require specific hubs that allow for a 9mm front through bolt and a 10mm rear through bolt. On most Shimano hubs (and some similar Formula type hubs) you can replace QR axles with solid axles and use axle nuts on each end.
How do you measure a mountain bike hub?
Here’s how to measure these distances:
- Figure out the distance between the lock nuts (where the hub sits in the dropouts) – 100 or 110 mm is typical for the front.
- Take that number and divide by 2.
- Then measure from the flange to the lock nut.
What is through axle mountain bike?
What is a thru-axle on a mountain bike? A thru-axle (TA) is a wheel attachment system that secures a wheel on a hub between a pair of dropouts on a bicycle frame or fork. The thru-axle threads directly through the fork/frame holes and into the wheel hub, which makes the wheel secure from detaching.