Handlebar racing 400-24.6 mm vintage bike R219

Not every 400 mm handlebar fits a vintage stem. The 24.6 mm clamp diameter is the precise measurement that matters when you're rebuilding a classic road machine, and this unit carries exactly that. It's a used racing handlebar, part of our stock of period-correct components for old bicycles.

The listing is from our handlebar inventory, a category where dimensions and clamp sizing separate a workable rebuild from a part that sits in a drawer. Width and diameter come from the part label: 400 mm across, 24.6 mm at the clamping area. Both numbers are the first check for compatibility.

Why a 24.6 mm Clamp Matters

• Width: 400 mm — a traditional road-racing width.
• Clamp diameter: 24.6 mm — an older standard that requires the correct stem.
• Condition: used, with photos forming part of the item description.

With this kind of component, the fit is not negotiable. You check the stem, then you check the bar. If your stem opens to 24.6 mm, this is the profile that slides in without forcing metal. A mismatch of even a fraction of a millimetre is a no-go on a bike you intend to ride.

Other bars in the same width exist, but the clamp figure is where most confusion sits. If you are after a wider option, there is also the PHILLIPE 410-25 vintage handlebar. Both show how fine the gradations were among classic parts.

This bar sits within our full derailleurs and drivetrain catalog, though the discipline is the same: measure twice, buy the exact number.