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Old 09-28-10, 01:44 PM   #1
fender1
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10 speed chain & cassette w/ 7/8 speed chain rings?

Has anybody successfully used modern a modern 10 speed chain and cassette w/ a crankset that has 7/8 speed chain rings? Any issues to speak of?
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Old 09-28-10, 02:00 PM   #2
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I replaced a 10 sp Shimano 105 crankset with a Shimano LX trekking 9 speed crankset. It works fine.
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Old 09-28-10, 02:08 PM   #3
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I've used the 9-speed chainrings with 10-speed components, but I'm quite certain that 8-speed and lower have a different width.
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Old 09-28-10, 02:18 PM   #4
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I've used the 9-speed chainrings with 10-speed components, but I'm quite certain that 8-speed and lower have a different width.
That o was my understanding as well. I can't seem to find inexpensive 110bcd 10 speed chain rings.
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Old 09-28-10, 03:19 PM   #5
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then you grasp why they push towards 8>9>10>11? obsolescence
make reasonably priced parts
obsolete and make you spend 4X as much..
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Old 09-28-10, 03:58 PM   #6
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Fender1,
I have an old Specialized square-taper road triple crankset (24-38-50) from the 80's, (no pins, no ramps) and use it with new KMC brand 10-speed chain and Ultegra 10-speed cassette and it works just fine. Shimano long cage 105 RD, Dura Ace 7803 triple FD; Shimano ST-6603 brifters. All components are shifting/running just fine together...... no issues at all. Go for it!
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Old 09-28-10, 04:46 PM   #7
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Measure the thickness of the teeth. Normal 10 speed teeth are about .078 inch thick. Much thicker might be a problem. I've got an old 7 speed hybrid with steel chain rings that are .078 inch thick, just like modern 10 speed.
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Old 09-28-10, 06:36 PM   #8
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9 and 10-speed cranks are for all practical purposed interchangable. I'm using a 9-speed Ultegra crank with a 10-speed cassette and a 5.9 mm Wippermann 10-speed chain with absolutely no problems.

7 and 8-speed cranks have a slightly larger gap between the big and small (or middle if it's a triple) chainrings so a 10-speed chain may hang up between the rings if the shift is done under duress. Anticipate your shifts and there should be no problems.
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Old 09-28-10, 06:38 PM   #9
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This is what I found on Sheldon Brown's site when I was researching the samething. Hope it helps.
http://sheldonbrown.com/speeds.html

Last edited by simp77; 09-28-10 at 06:42 PM. Reason: only part of the post was visible
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Old 09-28-10, 06:47 PM   #10
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I've used 9-speed cassette and chain with 7-speed triple crankset with absolutely no problems.
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Old 09-28-10, 06:53 PM   #11
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You won't have a problem with a 7/8speed crank. You may have a bit of noise but that's it. I tried a 10speed chain on a 6 speed freewheel and it would slip in some of the gears, but the freewheel is 25 years old so maybe no surprise there.
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Old 09-28-10, 08:02 PM   #12
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Thanks everyone, for the replies.
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