converting frames to take disc brakes
- Thread starter nic
- Start date
B3
Senior Retro Guru
I've just done this to my son's GT, it's a cro-mo frame, the bracket fits on the end of the tube (where it's thickest) and the dropout. I'm using a 140 disc to keep the braking forces lower, but figure they can't be any worse than the loads fed into the middle of the seatstay from canti's.
I made the tab myself and TIG'd it on, all it's cost me is fresh powdercoat, some new decals and a bit of time, but them i'm lucky to have all the equipment.
I made the tab myself and TIG'd it on, all it's cost me is fresh powdercoat, some new decals and a bit of time, but them i'm lucky to have all the equipment.
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kanerdog1x1
Senior Retro Guru
well done, thats a clean job. what tig you got?
kanerdog1x1
Senior Retro Guru
ac/dc, most jobs covered then.
Absolute braking force remains the same but the nearer the force is applied to the hub the greater that force is relatively speaking - the spokes act as a lever multiplying the force.
In English - the load on a disk mount is potentially a lot more than the load on cantilever bosses.
In English - the load on a disk mount is potentially a lot more than the load on cantilever bosses.
if you imagine the disc rotating and the caliper clamping , the rotation will put the seatstay - dropout joint under more stress . thats why most put a tube from that point to the chainstay . or a disc mount that has a continuous weld along the stay from eye to eye to act as a gusset
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