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using 9 speed crank on 6 speed drive train(5 posts)

using 9 speed crank on 6 speed drive trainjradford
Feb 26, 2003 4:56 PM
Can this be done?

If not why and what crank set would work on a 6 speed system. I am looking fo a 6 speed crank with a 53 39.
The rear is what makes it...Lone Gunman
Feb 26, 2003 5:25 PM
various "speeds". Just need to use the correct BB. I ran into a problem last year when rebuilding an old bike, wanted to use a cartridge type bb as opposed to the cup and bearing type. The cartridge type would not fit into the bb shell as one of the tubes got in the way inside the bb shell. Also if the crank accepts the tapered square bb axle, no problem, again just get the right size bb cartridge. Any shop can do that for you.
I don't think you mean "crank"jtolleson
Feb 26, 2003 6:51 PM
I think you mean cassette (you are referring to your rear gearing). Whether you can make the leap from 6 to 9 will depend on the spacing between your rear dropouts and will also require a new rear hub (assuming that you've got a cassette and not a freewheel back there).

Am I missing something?
I don't think you mean "crank"jradford
Feb 27, 2003 6:22 AM
know i do meen the front crank and if the width of the chain rings are different on 9 or 10 speeds compared to a 6 speed.
crank is fine, chainrings might be an issuedotkaye
Feb 27, 2003 12:55 PM
the spacing between the inner and outer chainrings on 9spd is slightly less than on 8spd and earlier. 8spd, 7spd, and 6spd are all identical AFAIK. The 9spd Shimano cranksets also are splined, not square taper, so getting one of these will also require a new bottom bracket.

I used a 6spd crankset and chainrings in an 8spd drivetrain with no issues, so going the other way should be fine. You should be able to find an 8spd crankset with 53 39 by roaming the web. For example a Sora crankset,
Otherwise get a square taper 9spd crankset and try it, replace the inner chainring if needed.