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Difference of opinion?

Old 03-18-08, 06:41 PM
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kpmupnorth
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Difference of opinion?

I have posted a query on the Vintage forum and thought I would see if there is general agreement or not from the Mechanics section.
Bike in question is 20 yo Italian CroMo frameset. Now has an Ultegra FC6600 10 sp hollow tech crank set and chainrings. Rear drive will have to fit old style threaded hub (i.e. freewheel style). Currently 6 sp fw, but considering 7 sp. Don't want to (can't presently afford to!) stretch the stays and put in new wheels.
Shifters are downtube friction , but possibly a change to index at least on the rear?

What size chain? Will 7-8 sp work or will it be too wide/fat for the 10 sp front chainring space. I can probably afford a 10 speed chain, but will it be too narrow/skinny and jam between the rear cogs? Thanks for the input.
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Old 03-21-08, 10:49 AM
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8 speed chain will work fine. The inner dimensions of the 10-spd chains are the same, and that's all the chainring teeth see.
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Old 03-23-08, 05:58 PM
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Thanks DMF. Would have gotten back to you sooner,but was out of town.
My concern with the different chain sizes wasn't with the inner dimension as much as the outer width. The two chain rings on the Shimano Ultegra hollowtech crank seem much closer together than the older 600 series that I removed. I think the 8 speed chain may be wider than the 10 speed, but not sure if it will matter much.
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Old 03-24-08, 12:33 PM
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I don't have the two here to measure, but I don't believe the ring spacing is different between the two. Otherwise indexed shifters and FDs would be n-speed specific (re: throw) and they're not.

Where you might see a difference is how the pins and ramps move the chain on front upshifts. But I'd be more concerned about how the rear shifts. And 8-speed chains are cheaper, so if it isn't acceptable you won't have wasted as much $ trying the other flavor.
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Old 03-24-08, 12:50 PM
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The outer side of the plate is wider, and you may have issues with shifting the front if you go with a 6-8 speed chain. A 10 speed chain would work, but I think they tend to be a little more expensive.

I have no experience, but I would try it, and if you do experience any problems I would look at increasing the spacing with a chainring spacer, something like:

http://www.loosescrews.com/index.cgi...d=629956914475

There are different thicknesses available.

I think in the long run it would be cheaper than using a 10 speed chain for a 6 or 7 speed setup... since you would always be able to use the cheaper 6-8 speed chain when you need to replace it.

Now, as to whether the ramps and pins on a 10 speed chainring is specific to the different outer plates, I have no clue...
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Old 03-24-08, 03:52 PM
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I don't know but I was about to suggest using a 9-speed chain.
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Old 03-26-08, 08:34 PM
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Thanks for the links. I think the info will be very helpful.
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