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Old 05-11-08, 05:32 AM   #1
bnelson
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road cranks

can fsa road cranks be used on mnt bike frame if one is for 68 and the other is 73 mm
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Old 05-11-08, 11:28 AM   #2
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Old 05-11-08, 11:51 AM   #3
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Quote:
Originally Posted by bnelson View Post
can fsa road cranks be used on mnt bike frame if one is for 68 and the other is 73 mm
68 and 73 sound like bottom bracket widths. Assuming you're using the correct bottom bracket, seems like it should work.
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Old 05-11-08, 12:11 PM   #4
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Originally Posted by bnelson View Post
can fsa road cranks be used on mnt bike frame if one is for 68 and the other is 73 mm
Not really sure I understand your question. I'll try to answer, but I'm not a pro.

Whatever the width of your frame's bottom bracket shell, 68mm or 73mm, you must use the corresponding BB width.

Now, the cranks themselves don't care how wide the BB shell is, so you can use the cranks on either.

Lastly, your crankset will need the correct BB spindle length to give the best chainline.
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Old 05-12-08, 10:09 AM   #5
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Which makes sense only if you're using a BB that has a spindle.

Seriously, there's not nearly enough information in the question to provide an answer.
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Old 05-12-08, 10:33 AM   #6
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Not to mention the various spindle types that have come out in the last 20 years.
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Old 05-12-08, 10:36 AM   #7
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There are a number of potential problems to solve.

1. There may not be clearance between the larger chainwheels on the road crank and the chain stay on the MTB frame. (the stay usually flairs out more quickly to clear larger tires than on a road frame)

2. You will have to determine what length bb axle to use (assuming as pointed out that the bb is not external) and the proper length may be longer than what was recomended for that crankset on a road frame.

3. You may need to use a road derailleur to accomodate the larger chain rings. If the MTB frame is set up for top pull derailleurs you may be mounting a turn around pully on the seatpost ala some cyclocross frames.

All of this has to be determined before a positive answer can be given.
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