Bicycle Mechanics - trek 1000 double crank

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staplemachine
08-20-07, 09:14 AM
I just bought a bontrager(truvativ) 53/39 to put on my triple trek1000.I did not think about botom bracket width.Is this an issue? The Sheldon brown chart shows only one size square spindle for truvativ.
Thanks in advance.

Re-Cycle
08-20-07, 09:32 AM
You need a longer BB.
capwater
08-20-07, 09:37 AM
You need a longer BB.

Triple to double? BB will be shorter to move in the chainline.

staplemachine
08-20-07, 09:38 AM
For some reason I assumed I would need a shorter one as I am dropping one chainring
Im a little confused?
capwater
08-20-07, 10:08 AM
Triples need the longer BB axle, double need a shorter one. Now that's assuming you don't have outboard bearing cranks. What type of new crank DO you have? That will help in the discussion greatly.
staplemachine
08-20-07, 10:18 AM
The bike has a bontrager sport triple(trutaviv) And I bought the exact make in a double.
capwater
08-20-07, 10:26 AM
Shimano UN-53, 68x107.
Re-Cycle
08-20-07, 10:27 AM
Ops 1K pardons, you guys are correct. Now awake, dog ate my homework...