Bicycle Mechanics - 7400 dura ace 112mm BB & 7410 double crankset, compatibility or not tight enough
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06-10-06, 08:50 PM
I have a 7400 dura ace english BB, 112mm long. When I installed it with a 7410 double crankset,
the drive side seems to be sticking out a bit that the front derailluer isn't able to get to be big crank, even
after tightening the crank bolt. The non-drive side (left) is fine.
Is it a compatibility problem or the crank bolt isn't tight enough? I put some grease on the threads
already. The allen wrench doesn't have too much leverage. Don't know if that's the reason.
Please give me some tips.
06-10-06, 09:12 PM
The 7410 crankset uses a 102mm bottom bracket, so the 112 you're using would definitely be too long. Unfortunately, the only Shimano taper bottom bracket I can think of that comes in a 102 is the Dura Ace, so you're pretty much committed to spending some money.
06-10-06, 09:20 PM
yes, thanks. I just browsed through sheldonbrown.com. 7410 is a special breed, 103mm length. The
only compatible BB is 7410. 7400 crankset is 112-113mm, compatible with my 7400 BB.
So either get a 7410 BB or get a 7400 crankset. yikes!!
06-10-06, 09:44 PM
Yeah, the older 7400 crankset wasn't nearly as low-profile as the sleeker 7410. I didn't know it used a bottom bracket that was 10mm longer though. That's a lot.
You're right that the 7410 needs 103mm and not 102mm. I think Campy Record uses a 102mm bottom bracket, which is the shortest one I can think of.
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