Reference
Handlebar clamp diameters: 22.2, 25.4, 31.8 and 35 mm
Pick a handlebar diameter to see how to measure it, where on the bar it applies, and the mounts and lights whose makers list that fit.
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- 22.2 mm
- 25.4 mm
- 31.8 mm
- 35 mm
- Flat stems, aero and non-round bars
Choose your handlebar size to see the key facts and what fits. Each fact links to its source on the full page.
Fits the most handlebar sizes
All handlebar sizes
- 22.2 mm 22.2 mm sits inside the CatEye H-34N, Knog Blinder and SP Connect ranges but below Quad Lock's 25-40 mm, where Quad Lock points to its zip ties.2 products that fit
- 25.4 mm 25.4 mm sits inside the Quad Lock, SP Connect, CatEye and Knog ranges, but not Wahoo's out-front mount for BOLT 3 and ROAM 3, which is for 31.8 mm bars.2 products that fit
- 31.8 mm 31.8 mm is the diameter Wahoo makes its BOLT 3 and ROAM 3 out-front mount for, and it sits inside the Quad Lock, SP Connect, CatEye and Knog ranges.2 products that fit
- 35 mm 35 mm is the top of CatEye's H-34N and Knog's Blinder 1400 ranges, inside Quad Lock's and SP Connect's, and not a size for Wahoo's 31.8 mm out-front mount.2 products that fit
- Flat stems, aero and non-round bars Quad Lock's separate Flat Bar Adaptor, SP Connect's included flat adapter, Wahoo's round-bar out-front mount, and why 'most tubes' is not a fit promise.