Readers ask: How Do I Know What Size Axle I Need For My Bike?

What size axle does my bike have?

Most thru-axles are described by four measurements, and you might see them described something like this: 15 x 100mm, 127 length, 1.5. 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.

How do I know what size axle I need?

For a front thru-axle, this is measured from the inside to the inside of your fork. For a rear thru-axle, this is measured from the inside to the inside of your frame at the drop-outs. The O.L.D. measurement is often listed for many thru-axles but isn’t necessary if you know the overall length.

What is 12mm thru-axle?

From this specification we know 142mm is the hub width (or frame spacing) and 12mm is the diameter of the axle. Total Thru Axle length from the seat to the end of the threads.

Can I convert quick release 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.

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How do I know what size quick release skewer?

Diameter: the skewer must fit inside the hollow hub axle. You may measure either the inside diameter of the axle, or the diameter of the present skewer. Most axles use a 5mm thick skewer. Skewers for wheels made for suspension forks may be 9mm (front) and 10mm (rear) in diameter.

Are thru axles better?

Thru axles takes the industry by storm So instead of u-shaped dropouts, they designed dropouts with holes and beefed up the axle. The thru axle threads directly through the fork holes and the wheel hub. This makes it nearly impossible for the wheel to detach. Thru axles are safer and improve bike performance.

Are thru axles necessary?

Thru Axles are no more ‘necessary’ than disc brakes, 11 speed gearing, or tubeless tires.

Do frames come with thru axles?

Thru axles are frame specific, not hub specific. You have to choose your wheels based on your frame and fork’s compatibility. To make things even more complicated, there is no industry standard when it comes to frame, hub or wheel designs – it really is dependent on the bike that you end up purchasing.

How do I know if my bike has a thru axle?

Thru Axles Your bike has a thru axle if the “drop out” is a hole, rather than a U-shaped dropout. This provides added security because even if the lever on the end of the thru axle flips open, it is still threaded into the frame, holding your wheel on.

How do you measure the width of a hub on a bike?

If you are unsure of your frame spacing or have an older bicycle, measure the hub width to ensure a proper fit. To do this, remove the rear wheel and use a pair of calipers or a ruler to measure the distance between the inner surfaces of the dropouts.

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What is 15mm thru axle?

15mm thru axle uses a different connection on the fork where the axle of the wheel allows a 15mm bolt to go through it. Same concept for a 20mm thru axle. Some wheel manufacturers have adapters that allow you to use the same wheel with the different fork hub standards by swapping out the axle ends.

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