View Single Post
Old 10-01-2009, 01:05 PM
Kevlarr's Avatar
Kevlarr Kevlarr is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: Mi
Posts: 1,628
Default No more broken studs or bolts for me!

Well I broke another stud yesterday, lucky for me it left quite a bit sticking out so I could remove it with vice grips.

Ran to the hardware store to buy some 6mm allen bolts since they don't have any studs long enough and in the tray right next to the bolts were bronze sleeves, a light bulb went off in my head! When you torque the bolts on the front strap it bends around the downtube causing the holes in the strap to get closer together and putting stress on the side of the stud, if only there was something we could put between the block and the strap.... 1/4" bronze sleeve bushings!

They're a little expensive ($2.25 each) and they smoke like a son of a b on the grinder but they worked perfectly! Bought two but I only ended up needing one, just cut it in half.

Best way I found was bolt everything up just not fully torqued, only tight enough to put some pressure on the strap, measure from the block to the strap and subtract about 1/8" cut and install.

I had to grind the right hand bushing on the side a bit to clear the frame but now everything is tight, there is no stress at all on sides of my bolts and if I would have thought of this before I don't think my studs would have ever broken in the 1st place.
Reply With Quote