Chluu907 wrote:
>>No. Buy 105 (although there is no 105 12-27 - which is unfortunate, as=
I
>>would like to build a 13-27, but Shimano don't make it easy).
> That's exactly what I'm trying to do. I have a 13-25 cassette and a 12=
-27
> cassette. All we need to do is free the 17-16 cluster on the 13-25 cas=
sette
> and we're in business. I checked several other cassettes 11-21, 12-23,=
but all
> have the 17-16 cogs on a carrier. Really stinks because some of us don=
't
> bother with the 12 at all unless we're on a descent.
My recollection is that the 16-17 pairs are not on a carrier, but that=20 they're just plain
sprockets rivetted together around a spacer for=20 easier installation. You can just drill or grind
the rivets to separate =
them, though I don't see any point in separating them, since you will=20 find it very difficult to
find a 16.5 tooth sprocket to put in between=20 them...
See:
http://sheldonbrown.org/carapace-2.html#fractional for an expos=E9 o= f=20 the Fractional Cog
Conspiracy.
Sheldon "Custom K7" Brown +----------------------------------------+
| The race is not always to the swift, | nor the battle to the strong | -but that's the way to bet.
| | --Damon Runyon |
+----------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone
617-244-9772 FAX 617-244-1041
http://harriscyclery.com Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com