Shimano compatibility question?

[victoryfactory]

I want to replace my DA-10 speed 7800 rear derailleur pulleys.
I happen to have a new set of the 7700 DA pulleys.
I guess they are 9 speed.

Are they the same?

VF

[Grant McLean]

Nope, they are different.

The 10 speed has 11 teeth, that's bigger than the 9sp which has only 10 teeth.

-g

[victoryfactory]

Thanks for the info, but that's where I got confused.
My DA 9 speed also has 11 teeth.
I was wondering if the DA 10spd pulley is narrower, like the chain.

VF