MTB crankset + 130mm hub = bad chainline?
I'm looking into doing a build of a light touring road bike and I want to have lower gearing but I also want close ratios and higher end components. My initial thought has been to get a road cassette for the close ratios and an MTB crankset for effectively lower gears, namely 48/36/26 rings.
So I viewed a recent QBP catalog and in it was listed Ultegra 9-speed shifters, and Ultegra 9-speed cassette and an Ultegra 9/10-speed rear derailleur. For a crankset, I was thinking about getting a Shimano XT 48/36/26 crankset. All 9-speed Shimano stuff so I shouldn't have any chain compatibility issues.
Now the problem, as cited from BTI-USA:
Includes 4-bolt 22/32/44t (M770) or 26/36/48t (M771) chainrings and BB set for 50mm chainline (135mm rear spacing)
Uh oh. I was going to use 130mm hubs with a 130mm rear-spaced road frame.
Can I just use a different bottom bracket that will give me a chainline more compatible with my road hub?
Last edited by thirdin77; 08-19-08 at 12:17 AM.
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Edit: the M771 uses a 2-piece crankset in which the spindle is permanently attached to the drive-side crank. You cannot swap spindles. Go with an older version or with another crankset that uses an Octalink, ISIS, or square-taper bottom bracket.
Originally Posted by thirdin77
Last edited by JiveTurkey; 08-19-08 at 01:17 AM.
Originally Posted by slopvehicle