Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It only takes a minute to sign up.
Sign up to join this community
I'm based in the UK and have bought some new handlebars that are 31.8mm for a hybrid 8 gear bike.
My old handlebars were smaller in diameter so my old gear shifter won't fit. No gear shifters online actually say the diameter of the handlebars they're made for. Is there a standard diameter for mountain bikes and road bikes? Can someone link me to an example 8 gear shifter that will fit 31.8mm handlebar?
Any help really appreciated.
22.2 mm (7⁄8 in) is the standard diameter for the brake, shifter and grip area of MTB handlebars.
I think you bought a bar that was designed for bar-end shifters only. Easiest way out of this is to swap the bar for one that allows shifters and brakes to be mounted on the area between the stem and forward turn.
Your handle bar is only 31.8mm thick at the clamping point. The parts of the handlebar where you mount the shifters/brakes/grips are 22,2mm ( I think ). Therefore they are always the same and you can mount your old or just buy one that is compatible with your deraileur.
