Handlebar size
25.4 mm handlebars: which light and phone mounts list it
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.
Also listed as 25.4mm, 1 in
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Short answer
A 25.4 mm bar is inside the ranges Quad Lock (25-40 mm), SP Connect (about 20-44 mm), CatEye's H-34N (22-35 mm) and Knog's Blinder 1400 (22.2-35 mm) list. It is not a size for Wahoo's BOLT 3 / ROAM 3 out-front mount, which Wahoo makes for 31.8 mm round bars. Measure your bar where the clamp will sit.
Key facts
- How to check yours
- Measure where the clamp will sit, in millimeters, because makers state their ranges that way (Quad Lock: 25-40 mm). Use a caliper, or wrap a paper strip around the bar, mark the overlap and divide that length by pi (3.14).[1]
- Mounts whose maker range includes it
- Quad Lock Handlebar/Stem Mount (25-40 mm, near the bottom of its range); SP Connect Universal Bike Mount (about 20-44 mm); CatEye H-34N headlight bracket (22-35 mm); Knog Blinder 1400 bar mount (22.2-35 mm).[1][2][3][4]
- Mounts that do not list it
- Wahoo's BOLT 3 / ROAM 3 out-front mount is for 31.8 mm round bars.[5]
- Shims, straps and adapters
- Quad Lock supplies 2 small and 2 large rubber O-rings and nylon zip ties with the Handlebar/Stem Mount. SP Connect includes one flat and one round diameter adapter.[1][2]
- Devices and lights
- Quad Lock says the Handlebar/Stem Mount works with all Quad Lock cases and Universal Adaptors. CatEye lists the H-34N for its AMPP, GVOLT, Sync Core, GE100 and HL-EL160/135 lights.[1][3]
- Not confirmed
- No source we read says where on a bar, or on which bikes, 25.4 mm is found. Peak Design's bar range for the Out Front Bike Mount V2 is not stated on its page.[6]
Watch out for
- Wahoo's BOLT 3 / ROAM 3 out-front mount is made for 31.8 mm round bars, not 25.4 mm.
- 25.4 mm is just inside Quad Lock's 25-40 mm range, so measure where the clamp actually sits.
- Quad Lock says its Handlebar/Stem Mount is not compatible with its Vibration Dampener.
What fits
Product details below are the seller's own description unless a source is shown. Pick the variant named for each item.
Phone mount
SP Connect Universal Bike Mount (phone, 20‑44 mm bars and stems)Choose the Universal Bike Mount (SKU 53342).
SP Connect lists bars or stems of about 20-44 mm, with one flat and one round adapter included.
Phone holder
ROCKBROS aluminium bike phone holder, handlebar clamp (4.7‑7.1 in phones)Choose the handlebar clamp version, not the headset-cap or stem versions.
ROCKBROS lists 22.2, 25.4 and 31.8 mm handlebars.
Front light
Knog Blinder 1400 front light (2nd gen, USB-C)Choose the Blinder 1400 (2nd gen, USB-C); it is the only version listed.
Knog lists a 22.2-35 mm bar mount.
Light bracket
CatEye H‑34N FlexTight headlight bracket (22‑35 mm)Choose the H-34N bracket; it fits CatEye lights only.
CatEye lists 22-35 mm, attaching without tools.
Next: how to measure your handlebar, bike phone mounts and their fit and Garmin vs Wahoo computer mounts.
Questions
Will a Wahoo out-front mount fit a 25.4 mm bar?
Wahoo makes its BOLT 3 / ROAM 3 out-front mount for 31.8 mm round bars, so 25.4 mm is not a size it lists.[5]
Will a Quad Lock mount fit a 25.4 mm bar?
Quad Lock designs its Handlebar/Stem Mount for 25-40 mm, so 25.4 mm is inside that range, near the bottom.[1]