Cluster 04 · Axles & frame

Axles & frame

The full axles & frame cluster, linked. Start with the pillar to identify your axle, then drop to the exact standard: quick release, thru-axle, Boost, Super Boost, hub spacing, diameter and thread pitch, plus the comparisons and how to measure it.

What axle does my bike use?Start here. Identify yours in four facts: type, width, diameter and thread pitch. Quick release (QR)A 5 mm skewer with a lever in open dropouts. Fast but less rigid. Thru-axleA 12/15 mm axle that threads into the frame. Stiffer and safer; mind length and thread. Boost 148 (rear)148 mm rear hub (+6 over 142). Stiffer, 52 mm chainline. Not 142 + a spacer. Boost 110 (front)110 mm front hub (+10 over 100), 15 mm axle. The partner of Boost 148. Super Boost (157)The widest rear (157 mm) for 29-inch enduro and downhill. ≈55 mm chainline. Hub spacing (OLD)The measurement that decides if the wheel fits: 100/110 front, 135/142/148/157 rear. Axle thread pitchM12×1.0 / 1.5 / 1.75 by brand. Getting it wrong destroys the frame thread. Axle diameter (12/15)12 mm rear/road, 15 mm front MTB. Can't reduce without changing endcaps. Quick release vs thru-axleWhich your bike has and why they don't interchange without a frame change. Boost vs non-BoostThe line dividing modern MTB. What matches and what can be adapted. Convert my hub to Boost?When it's possible with endcaps and spacers, and why you must re-dish the wheel. How to measure my axleThe 4 dimensions so you don't miss: diameter, total length, thread length and pitch.