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Chainring: is there a difference b/w 39t campy 9s & 10s ?(4 posts)

Chainring: is there a difference b/w 39t campy 9s & 10s ?PeterRider
Nov 26, 2003 2:47 PM
9s chainring comes off a Record crankset (inner ring on double)
10s chainring is on a Centaur 10s crankset (inner ring on triple)

Besides maybe quality of materials, can I use the 9s ring on the 10s crankset ?

Thanks !

Pierre
re: Chainring: is there a difference b/w 39t campy 9s & 10s ?StmbtDave
Nov 26, 2003 3:40 PM
I'm not sure if the spacing difference between the 9s and 10s is an issue for the 39 chainring but there is a difference between the inner on a double and the middle on a triple. The middle ring on a triple will have pickup pins on the inside to help move the chain up from the inner chainring. The inner chainring on a double has no pickup pins. Only the outer chainring on a double has the pins. If you move the 39 double to the triple setup you will notice a loss in the shifting smoothness. You will be able to make the shift but you will have to play with the shift lever a lot more than you would if the ring had the proper pickup pins.

Dave
Not exactly: this is a double inner moved to a triple inner...PeterRider
Nov 26, 2003 8:26 PM
... not a double inner moved to a triple middle (and yes, this is a 39t used as the inner of a triple, the bike has small 20inch wheels so the 2 other rings are 48 and 60). And the spacing is not an issue as the triple I am using is designed for 10spd.

My question was more about the width of the ring itself, or its shape, the pattern...

Pierre
re: Chainring: is there a difference b/w 39t campy 9s & 10s ?Rusty Coggs
Nov 27, 2003 7:18 AM
The '10 speed difference' is in the outer ring, which is 4mm closer to the inner ring. The double ring will not be pinned and ramped, as is the typical middle ring on a triple.