I have a KALLOY UNO HB-005 580 mm handlebar and a shifter with brake combination, Shimano Alivio ST-M310. I have a Sora derailleur and crank set. I got as a gift a bullhorn Origin8 Bully Bullhorn 6061-T6 Handlebar 400mm wide 31.8mm clamp.
The problem is that the shifter's mounting ring is not enough wide to get on the bullhorn at all, I can't imagine how to put on it and if I manage the first centimeters, than there is a corner. How can I fit the shifter/brake on the new bullhorn or do I have to change the shifter system?
If only the mounting ring can be changed I would be happy. I opened the sifter but the bolt which holds together the brake lever and shifter is blocked mechanically (doable). Is there another brake lever that has a wider ring and can be replaced with the current one, so I can keep the shifter?
I measured the old and new set:
- KALLOY - 22.20[mm]
- Origin8 - 23.88[mm]
- Shimano Alivio - 22.38[mm]
Would it be a structural integrity problem, if I grind 1-2mm of the inner wall of the mounting ring?