valentin_84

I have a 2013 Specialized Allez Comp that I'm converting to a 1x8 with bullhorn handlebars and reverse brake levers. I am also wanting to mount a mountain bike 8 speed shifter on the base of the bars, next to the stem.

The problem that I've run into is that the shifters come with a 22.2mm internal clamp diameter and the reverse brake levers come with a minimum of 19mm diameter...

I've found handlebars with a 25.4mm clamp diameter, 23.8mm grip diameter where the shifter would mount, and a 19mm inner diameter where the reverse brake levers insert. The brake levers would fit right in to the ends correctly, but I would have to modify the shifter and maybe bore the clamp out 1.6mm in order for it to be able to slide on.

The other option is a 22.2mm grip diameter and an 18mm internal diameter. This is a thinner bar that will allow the shifter to just slide right on, but I would have to bore out the ends a millimeter to allow the brake levers to fit.

Which would you guys choose? Anyone run into this issue?

fietsbob

got reverse levers for the ends , front of the bar already??

23.8 and a thumbie shifter would work ..

Issue encounters.. MTB ones may not slide around the bends, need a hinged mount then .. or 1 that comes apart.

dsbrantjr

I'd be concerned that the shifter clamp would not have enough meat to hold its shape well with that much taken off. Then there is the matter of getting it bored out and keeping it reasonably round in the process.

Thumbies or similar might be a better approach.

gregjones

My bars are 23.8 and one wrap of a .004 feeler gauge, cut to length, makes my 26mm thumbies fit without troubles. It may not be close enough to get a rocket to the moon but it's close enough to make shifters work on a bike.