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  1. #1
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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

  2. #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

  3. #3
    AEO
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    the FD needs a height, Hi-Lo limit and cable tension readjustment.
    check park tools on how to do it.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  4. #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.

  5. #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.

  6. #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.
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

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