Interesting Facts About Thru Axles

Important information on how to correctly determine the installation length [mm] of your thru-axle

We frequently receive inquiries asking why our thru-axle lengths aren’t selectable in our configurator until 155 mm, and why Syntace X-12 thru-axles aren’t selectable until 150 mm.

However, many customers often mistakenly rely on the " 12 x 142 " or " 12 x 148 " markings on the thru-axle.

However, this marking only indicates the hub width (142 mm or 148 mm); the number 12 refers to the outer diameter of the thru-axle (ø12 mm).

Hub width refers to the inside dimension of the rear wheel rim or the outside dimension of the rear wheel.

However, the key factor is the “INSTALLATION LENGTH” [mm], which is calculated as the sum of the hub width and twice the length of the frame stays.

Standard thru-axles always have a flat stop at the end.

Syntace X-12 thru-axles, on the other hand, always have a tapered ring.

You can use our measurement template here.