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One of my plastic shifters broke and I am looking for a replacement on the internet. How do I know whether a replacement will fit my handlebar. Are all handlebars the same size?

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1 Answer 1

Handlebars are (almost) all 22mm = 7/8 inch where the brake and gear selectors go. Any shifter, brake lever or combination part will be designed for 22mm. Drop bars are fatter but the shifters for those are not plastic, so I very much doubt you have those.

The size where they bolt on to the stem varies, but if you're not replacing the handlebar that doesn't matter (so don't worry when you see "35mm handlebars" advertised, that's the size of the bulge in the middle where they attach to the rest of the bike).

What's more important is the number of rear cogs you have. If your current shifter is 7 speed, you need a 7 speed replacement. Ditto for 8,9,10 or 11 speed. Also, the brand of the shifters matters, you'll need Shimano compatible or SRAM compatible for it to work properly.

As DWGKNZ says in comments, replacing this part yourself is a bit of work and you will probably want at least a new gear cable (the wire inner part). Getting it adjusted properly is tricky but there are lots of tutorials on the net like this written one or this video. Note that they focus on the derailleur end because that's where you do the adjustment.

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It's also very important to match your shifter with the same brand of rear derailleur, if you have SRAM RD you need a SRAM shifter and the same for Shimano. This doesn't matter for the front. Changing a shifter is a difficult job as you need to release the shifter cable at the derailleur and pull it back through the cable outers to remove it from the shifter. Then you have to thread it all back in again and re-align the rear derailleur. It's worth getting a new cable rather than reusing. Better still it's easier to get your LBS to do, it can be a frustrating job. –  DWGKNZ Jun 22 at 23:23
    
This isn't true - road bars grip area at 23.8 mm normally, while flat/riser bars clamp at 22 mm. Also, SRAM makes Shimano compatible shifters under their Attack! line. –  Batman Jun 22 at 23:24
    
@Batman I haven't ever seen plastic drop bar shifters so I assumed the OP didn't have drop bars. –  Mσᶎ Jun 22 at 23:41
    
Shimano ST-A070 are plastic, among others. There are also the ridiculous walmart 22mm drop bars which are cut in half and have gripshifts on them on the walmart road bikes. –  Batman Jun 22 at 23:47
    
Wow, that's just ... cheap. I hope the clamps are metal. –  Mσᶎ Jun 22 at 23:51

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