
Man, I need a shower !
Reputation:
cassette, Rd and chain length ??
I currently have a 1329 cassette (that I use primarily for long mtn climbs) with what I assume is a long cage Campy RD. I'm getting another wheel set for use with the same bike, but want to go to different cog ratios for more typical training rides. Since there is concern for chain length, etc., what's the smallest large cog that would be compatible with this set up  would either a 1225 or 1326 work?
Thanks

Roadbikereview member
Reputation:
Originally Posted by fasteddie
I currently have a 1329 cassette (that I use primarily for long mtn climbs) with what I assume is a long cage Campy RD. I'm getting another wheel set for use with the same bike, but want to go to different cog ratios for more typical training rides. Since there is concern for chain length, etc., what's the smallest large cog that would be compatible with this set up  would either a 1225 or 1326 work?
Thanks
Any of the two cassette should be fine, with your present setup, the long RD will take up the chains extra slack.
Rick

think about it...
Originally Posted by fasteddie
I currently have a 1329 cassette (that I use primarily for long mtn climbs) with what I assume is a long cage Campy RD. I'm getting another wheel set for use with the same bike, but want to go to different cog ratios for more typical training rides. Since there is concern for chain length, etc., what's the smallest large cog that would be compatible with this set up  would either a 1225 or 1326 work?
Thanks
The worst case condition is the little chainring and the 12T cog (which you should not use anyway). If the chain length is correct it will have some tension in this combination. This 1tooth change is only equivalent to 1/4 inch of chain. The minimum increment that can be removed from the chain is 1inch.
Using a cassette with a smaller maximum cog changes nothing. You have the same cogs on the 1329.

Originally Posted by fasteddie
I currently have a 1329 cassette (that I use primarily for long mtn climbs) with what I assume is a long cage Campy RD. I'm getting another wheel set for use with the same bike, but want to go to different cog ratios for more typical training rides. Since there is concern for chain length, etc., what's the smallest large cog that would be compatible with this set up  would either a 1225 or 1326 work?
Thanks
You only need to be concerned that you have enough chain to span the big/big combo  if that combo is selected by mistake (as it's not normally a usable combo due to severe chain angle). Damage will result if you don't have enough. With smaller large cogs you will then have a little extra chain  no big deal.

Reputation:
Originally Posted by Mike T.
You only need to be concerned that you have enough chain to span the big/big combo  if that combo is selected by mistake (as it's not normally a usable combo due to severe chain angle). Damage will result if you don't have enough. With smaller large cogs you will then have a little extra chain  no big deal.
If you use the bigbig measuring method you'll have to extend your chain if you switch from let's say a 1121 to a 1225. With the smallsmall method you won't.

Originally Posted by divve
With the smallsmall method you won't.
And by that method you'll only have enough chain by chance, not by choice. That's not a method SRAM endorses and they make chains.

Reputation:
Smallsmall isn't by chance. It's always correct provided you stay within the derailleur wrap capacity. Campagnolo describes this method in their manual and they make 10 speed chains which SRAM hasn't even heard of
Posting Permissions
 You may not post new threads
 You may not post replies
 You may not post attachments
 You may not edit your posts

Forum Rules

