Q? re Shimano CRANKS. Can I run 10 spd rings/chain on 9spd cranks?

[Bigbananabike]

Hi.
Is this a cheap/cheats way to have a 10 speed set up? Or will it not work? Will the spacing between the chainrings drop/derail the chain etc?
Advice & ideas welcomed
Cheers, Paul

 

[capwater]

Hi.
Is this a cheap/cheats way to have a 10 speed set up? Or will it not work? Will the spacing between the chainrings drop/derail the chain etc?
Advice & ideas welcomed
Cheers, Paul

Why bother? You can run a 10 speed drivetrain with 9 speed cranks and rings. I've done it on a couple of bikes no problem.

 

[gclark8]

The only bits that "must be 10 speed" are, the RH shifter, the rear cassette, and the chain. For the rest, 9 speed is fine.

 

[Albert 50]

http://cycle.shimano-eu.com/publish/content/cycle/seh/nl/en/technical_service/faq_s/compatibilty_charts.-MainContent-0005-DownloadFile.tmp/Front%20drive%20road%20compatibility.pdf.pdf

I suppose it is of no suprise that shimanos combatibility chart suggests this Q is a no go. Liability & commercial interests to name a couple reasons. Sometimes the real proof is in the pudding.

 

[capwater]

I suppose it is of no suprise that shimanos combatibility chart suggests this Q is a no go. Liability & commercial interests to name a couple reasons. Sometimes the real proof is in the pudding.[/QUOTE]

Course they nix the idea. They want to sell you those fancy (and expensive) outboard bearing cranks! Gosh forbid someone keeps using their perfectly good Ultegra 6500s.

 

[jamesdemien]

Should work as suggested above...but the 10 speed chain may have trouble making the jump on the 9 speed spacing since its narrower...the chain grabs the little ramps on the chain rings allowing it to shift up and down.

It wont be a perfect set up but should work... why do you want 10 speeds anyway...you could just swap your big or little cog for the next size and have the same effect. I have 10 speed ultegra and only use 3 or 4 of them...