Road bike handlebar 400-24.6 vintage bike eroica R265

Two numbers define this drop bar: 400 mm across the drops and a 24.6 mm clamping area. Reference R265 keeps one unit distinct from the next in a wall of bars that can look similar at a glance. Sourcing an exact fit is often the first problem; the clamp bore is the pass/fail measurement before any aesthetic judgment.

What the 24.6 mm diameter means to a build

The clamp spec is unusually specific. This is a dimension that belongs to a particular generation of French and European production. If your stem clamps at 24.6 mm, the search ends here. If not, you would be filing or shimming to make it work, which is a different project entirely.

• Width: 400 mm
• Clamp diameter: 24.6 mm
• Inventory reference: R265

The photos form part of the description. The surface will carry the usual small marks from storage and prior use — light scuffs, faint cable rubs. No major defect is declared for this bar, so you should not expect a bent or cracked tube. A quick visual check of the images gives the rest of the story before you commit to a build.

For a larger array of drop bars with different clamp tolerances, the 400-24.6 mm vintage bike Eroica R219 lives in a parallel bin with the same key measurement. If you need a slightly broader platform, the 410-24.8 mm vintage bike Eroica R356 moves up in width while changing the clamp by two-tenths of a millimetre.