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9 sp Chain on a 7 sp Crank

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9 sp Chain on a 7 sp Crank

Old 10-03-12, 02:11 PM
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cs1
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9 sp Chain on a 7 sp Crank

I'm planning on an upgrade to an old MTB. Can you use a 9 sp chain on 1992 Deore DX crank?
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Old 10-03-12, 02:15 PM
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Bill Kapaun
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Probably.

For a shot time, I was using one on an old cottered crank from an early 70's 10 speed.
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Old 10-03-12, 09:50 PM
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I have a 9 speed chain on an old Sugino double crank and the only problem I have had is depending on the chain angle (angled out to the smaller rear cogs), the chain will once in a while ride on top of the smaller ring when downshifting from the big to small chainring.
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Old 10-04-12, 02:28 AM
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Originally Posted by ParaWK4 View Post
I have a 9 speed chain on an old Sugino double crank and the only problem I have had is depending on the chain angle (angled out to the smaller rear cogs), the chain will once in a while ride on top of the smaller ring when downshifting from the big to small chainring.
Thanks, this more of a project than a necessity. I'm trying to update, not upgrade, a vintage MTB. The original cranks just look right compared to to current models.
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Old 10-04-12, 03:47 AM
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I use a 10 speed chain on a 1980s "5 speed" crank on my road bike without problems.
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Old 10-04-12, 05:26 AM
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A 9 speed chain will probably work, but 7 speed chains are cheaper than 9, so why do you want to spend money on a product with won't have 100% compatibility?

You have said it's an update, not an upgrade, but its not really either as you are bringing in possible in-comparabilities for no reason. Updating would just involve fitting a new 7 sped chain.
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Old 10-04-12, 08:28 PM
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I set up a friend's bike with 7-speed triple crank, 7-speed derailleurs, and 9-speed shifters, cassette, and chain. It worked perfectly with minimal adjustment needed. I was surprised how well it shifted.
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Old 10-05-12, 04:45 AM
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Originally Posted by jimc101 View Post
A 9 speed chain will probably work, but 7 speed chains are cheaper than 9, so why do you want to spend money on a product with won't have 100% compatibility?

You have said it's an update, not an upgrade, but its not really either as you are bringing in possible in-comparabilities for no reason. Updating would just involve fitting a new 7 sped chain.
Not quite, I was planning on doing the Sheldon Brown 8 of 9 on 7. Which means the 7/8 sp chain is a little too big for a 9 sp cassette.
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Old 10-05-12, 05:38 AM
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Originally Posted by cs1 View Post
Not quite, I was planning on doing the Sheldon Brown 8 of 9 on 7. Which means the 7/8 sp chain is a little too big for a 9 sp cassette.
If you already have the parts, there's no loss in trying it out. If you have to buy parts, maybe you should just buy a 7 sp cassette and chain. Am I missing something?
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Old 10-05-12, 11:01 AM
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Originally Posted by cs1 View Post
Not quite, I was planning on doing the Sheldon Brown 8 of 9 on 7. Which means the 7/8 sp chain is a little too big for a 9 sp cassette.
I am friction shifting an 8 of 9 setup and am therefore using the 9 speed chain.
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Old 10-05-12, 12:08 PM
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I tried a 9-speed chain on an 8-speed crank and I was always throwing it off the little ring on downshifts. No amount of futzing with the derailleur stops would fix it. Put an 8-speed chain on again and all was fine. I suspect it's mostly a function of the specific chainrings... this was an Athena crank.
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