My Musashi has a SRAM Rival 10-sp group to include a 1070, 11-32 cassette installed on it. Smoothest shifting cycle I own with this cassette. I prefer a close-ratio cassette, so I installed a SRAM 1070, 12-27. Result - worst shifting bike I own. The chain will not ramp up on the 27T cog, even if I adjust the derailleur limit screw out far enough for the cage to contact the spokes. Thought the problem might be the new  
Velocity rear wheel I recently installed. Installed the 11-32 cassette on the Velocity wheel, and the result was smooth shifting. Since both cassettes are 1070 Series, their designs should be the same. The only conclusion I can come to is the 12-27 cassette is defective. Anybody ever experienced a similar problem?  
 
I've experienced some shifting problems with cheap cassettes, but this was not a cheap cassette.
I'm going to have to use it as a paperweight, because I shredded the Performance Cycle receipt.  

Did you buy it in the store?  Last time I was in there they told me if you give your personal info you don't need a receipt for returns.

They may well have you "in their system" to be able to bring up the purchase on the computer/register....   Worth a shot...

Quote from FlyingLaZBoy on Jun 23^rd, 2011, 7:44am:

 
I'm in their computer. I'll clean the cassette up, take it back and see what happens.