Mountain bike
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Will the frame of a Trek 3900 mountain bike take a rear disc/caliper assembley?



Some technical advise would be much appreciated!

If there's a couple of threaded screw holes on the left hand seat-stay [just above the rear hub] running parallel to the axel then yes...
But you'll also need your hubs to be disc specific, on the left hand side of the hubs should be six holes running around the outside of hub, just where spokes meet, if not you need some new wheels so you can run them....
If you were considering cable discs then i wouldn't bother as there no more powerful than v-brakes.so stick with hydraulic units....
If your frame is not disc specific, then a German company called Magura do hydraulic rim brakes....
The site I got my hydraulic discs from do wheel and disc packages ready to fit, and it'll be harder to find cheaper@ merlincycles.co.uk... Also try:
chainreactioncycles.com
evanscycles.com
Good luck, and hope you under stand, as its hard to explain in an answer..... Source(s): Experence
I don't think so.

The frame doesn't have the mounting points to attach the disc kit.
The lowest grade trek model that does include them is the 4300 I think. Best to go to a dealer to be sure.
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