Search found 3 matches

by deo
17 Sep 2020, 11:19pm
Forum: Bikes & Bits – Technical section
Topic: Shimano Dura Ace ST-7900 shifter/lever rebuild
Replies: 10
Views: 518

Re: Shimano Dura Ace ST-7900 shifter/lever rebuild

I was able to tap the bolt loose and as I suspected the other end of the Broken spring was still present. The old piece was removed and after examining the bushing it looks like it has a fracture. This may be the reason for the broken spring as it rides next to the bushing. Thanks for your help and ...
by deo
17 Sep 2020, 7:19pm
Forum: Bikes & Bits – Technical section
Topic: Shimano Dura Ace ST-7900 shifter/lever rebuild
Replies: 10
Views: 518

Re: Shimano Dura Ace ST-7900 shifter/lever rebuild

I was able to remove the spring without backing out the bolt that holds the gears. Because it was located at the very front of the gear package I was lucky enough to easily unwind the broken spring over the front of the housing. I’m not sure if I have removed the spring completely so my next step is...
by deo
16 Sep 2020, 11:27pm
Forum: Bikes & Bits – Technical section
Topic: Shimano Dura Ace ST-7900 shifter/lever rebuild
Replies: 10
Views: 518

Re: Shimano Dura Ace ST-7900 shifter/lever rebuild

Hi, This is my very first post so here I go. Last Saturday I lost the function of my Right Shimano ST-7900 shifter (down shift) but I was able to up shift normally. After examining the shifter and calling a couple of local bike shops I’ve come to the conclusion that a spring has broken within the ma...