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Old 12-04-11, 12:21 AM   #1
lhorn
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8 speed Shimano 600 with new crank

I have an old bike with full Shimano 600 8 speed components. I swapped on a newish FSA Gossamer crank in order to get compact gearing.

If the FSA crank came off a 10 speed bike, should I expect any compatibility problems? In otherwords, should I have need to change chainrings or any other components to avoid having the chain rub the FD or rub on the chainrings?

Thanks
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Old 12-04-11, 07:31 AM   #2
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Quote:
Originally Posted by lhorn View Post
I have an old bike with full Shimano 600 8 speed components. I swapped on a newish FSA Gossamer crank in order to get compact gearing.

If the FSA crank came off a 10 speed bike, should I expect any compatibility problems? In otherwords, should I have need to change chainrings or any other components to avoid having the chain rub the FD or rub on the chainrings?

Thanks
If the crankset and BB are compatible I would expect adjustments to the H and L travel limiting screws along with lowering the FD. There maybe a need to respace the chainrings for use with the 8S chain.

Brad
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Old 12-04-11, 07:39 AM   #3
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the FD needs a height, Hi-Lo limit and cable tension readjustment.
check park tools on how to do it.
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Old 12-04-11, 08:36 AM   #4
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An 8-speed chain might rub badly on the big chainring while in the little chainring. You could use a 10-speed chain which will work with an 8-speed cassette.
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Old 12-04-11, 07:39 PM   #5
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Thanks for the replies. As you guys surmised, it's the little chainring that is giving me problems. I adjusted for a while last night and got to the point where I get 7 of the 8 rear gears while on the big chainring without rubbing on the FD. When I shift to the small chainring I can only use about the lowest 4-5 rear gears before I get rubbing. I got a chance to go for a ride today and was pretty happy. I use the big chainring 95% of the time and that works well. When I hit a big hill I can still get my lowest gears OK. I just don't have the luxury of crosschaining with the small ring gear on the front and small gears on the back. No big deal since I don't do this much anyway.

Thanks for the recommendation about getting a 10 speed chain. I think I'll use up my current 8 speed chain but when I have to get a new one will try a 10 speed chain.


I'd consider upgrading to 10 speed but it's really the cost of new brifters that is turning me off. Would I get any benefit from using my current 600 brifter, but getting a newish FD meant for 10 speed? I've heard that the cage might be a little wider allowing me a little more chain clearance. Since FD are pretty cheap I'd be willing to do this if it might help.

Thanks for everything.
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Old 12-04-11, 08:23 PM   #6
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10 speed FDs should actually be narrower so I don't think that would be a good idea. As Sheldon points out, I believe it isn't the crankset that is "10 speed" but rather the chainrings. An older little ring may solve your problems.
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