shimano 10 speed vs 9 speed, dura ace - spot the difference

[BullGod]

this is gonna sound really dumb, but....

I have 2 bikes....a trek madone frame (new) with older dura ace groupset. also have a cinelli unica, new this year.

i've been chopping and changing wheels and cassettes over the season, and now i need to replace chains. problem is that one cassette is 10 speed, the other 9....and i don't know which bike is which as far as putting the right chain on is concerned. at the moment the 9 speed is on the cinelli, which i'm fairly certain was the original case, but i can't be sure as most newer bikes should be 10....

does anyone know how you can tell the difference? is there somewhere on the groupset where you can see the specs?

 

[padawan]

does anyone know how you can tell the difference? is there somewhere on the groupset where you can see the specs?

The casette lock-ring on Shimano is usually labeled with the model number. Also, shimano 10 speed spacer rings for the cassette sometimes say 10 S right on them.

You can also run through the # of clicks on the right hand shifter - 8 for 9 speed, 9 for 10.

 

[capwater]

You're kidding, right? Look at the shifters, they are very different shapes. As far as cassettes go just start with 1 and count until you're done.

Am I missing something in your original questions?