Adding an 11T to cassette

Perrin21

Devout Dirtbag
I have just purchased an XTR950 cassette and it's 12-32t ideally I'd like an 11t as the smallest cog. Can this be swapped in place of the 12T? What else do I need? Is there a proper XTR950 option?
 
As Osella says, you can if you change the lockring. The problem is that you get a horrible 11-14t jump at the top end, and your options to change other ratios to suit are limited by the use of a spider for the bigger sprockets.

All 8-speed options are listed here, but some are getting hard to find:

http://www.sheldonbrown.com/k8.shtml
 
It's not something I'd be keen on.

If you don't need the 32t, there are a few 11-up 8-speed cassette options (11-28, 11-30) but obviously the spider of your XTR cassette stops you just ditching the 32t and adding an 11.

9-speed cassettes come in 11-32 (11,12,14,16...) - you'd need a new cassette, chain, and rear shifter. A bigger chainring might be another option.
 
how often do you use the smallest cog on a cassette?

For me, the largest and smallest sprockets get the least use. With knobbly tyres and relatively unaerodynamic position on an mtb, I don't think I ever use the smallest sprocket, even when down hill.

Just pedal faster ... unless you have a small big chainring (you know what I mean)
 
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