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Will an old 6 speed Deore rear derailleur and crankset work with a 9 speed cassette.

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Will an old 6 speed Deore rear derailleur and crankset work with a 9 speed cassette.

Old 05-16-16, 01:01 PM
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bluenote157
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Will an old 6 speed Deore rear derailleur and crankset work with a 9 speed cassette.

I'm in the process of converting my 80s Rockhopper's components and throwing an xtracycle on it. I have a set of 9 speed wheelset/cassette/chain that I intend on using. I will continue to shift with a friction barcon shifter. Will my old 6 speed derailleur and crankset work or will I have problems with the chain dropping in between the chainwheels and a potential for some sort of rear derailleur pulley disaster? My understanding is the cage is wider to accommodate a 6 speed chain and going with a thinner 9 speed chain will give a lot of travel and potential for some sort of lock up?? thoughts?
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Old 05-16-16, 01:35 PM
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Once upon a time while researching 165mm cranks, I put one on my "upgraded" 9 speed, 86 Rockhopper.
"One" being a crank from a 2X5 early 70's Takara road bike.
YMMV. Try it, using a bit of initial caution.
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Old 05-16-16, 01:45 PM
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Ive used an old Shimano 600, 6-speed RD with an 8-speed cassette earlier.
Upshifts were a bit sluggish, but indexing was fine.
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Old 05-16-16, 01:55 PM
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9 speed is just about as wide as 8 are , and 7 is made to go in a 6 speed hub, 8 is just 1 cog wider with the same spacing as 7.

so will the stroke across the rear cluster, be that much wider swing ? , it is Measurable.
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Old 05-16-16, 02:10 PM
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Friction shifting is your friend. If you have any trouble it will be on the front. Frankly, I seriously doubt that will happen either. If it was my bike, I'd go for it.
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Old 05-16-16, 02:23 PM
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I bet it would be fine however, friction shifting a 9 speed won't be fun. My limit for friction shifting is 7 speeds, but only when necessary. Friction shifting becomes difficult because the cogs are so close together.
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Old 05-16-16, 04:34 PM
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Originally Posted by corrado33 View Post
I bet it would be fine however, friction shifting a 9 speed won't be fun. My limit for friction shifting is 7 speeds, but only when necessary. Friction shifting becomes difficult because the cogs are so close together.
Using barcons seems to make it a smidge easier, in my experience. I've run eight and nine speed on a bike with Suntour Cyclone derailleurs, and Suntour bar end shifters. Eight works just fine, but nine can be a bit fidgety. Nothing jams or anything, it's just harder to nail the shifts.
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Old 05-16-16, 06:33 PM
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Friction shifting 9 or 10 speed is not difficult. The cogs are close so you can't miss or get caught between cogs.
Just make sure the chain and cassette are in good condition.
I would do it and see how you get on.
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Old 05-16-16, 06:42 PM
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I would be cautious about the chain jamming between the chainrings.
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Old 05-16-16, 10:45 PM
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Originally Posted by Raiden View Post
I would be cautious about the chain jamming between the chainrings.
Yeah..that is definitely a concern. Thanks for all the replies guys.
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Old 05-16-16, 11:36 PM
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Originally Posted by corrado33 View Post
I bet it would be fine however, friction shifting a 9 speed won't be fun. My limit for friction shifting is 7 speeds, but only when necessary. Friction shifting becomes difficult because the cogs are so close together.
I friction shift 9-speed with Shimano bar end shifters. I need to be pretty precise, but it works. With practice/regular use you'll probably get pretty good at it.
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