Originally Posted by
well biked
Hey, do you know if the ten speed Dyna Sys cassettes have different cog spacing than other Shimano and SRAM ten speed cassettes? I was just looking at some specs on the QBP site and the Dyna Sys cassettes are listed as having "Shimano mountain 10" spacing, whereas other Shimano ten speed and SRAM ten speed cassettes are listed as "Shimano 10 RD/SRAM 10" in regard to cog spacing.
If the cog spacing is different with Dyna Sys, then toolong will need to use a SRAM 10 speed cassette in 11 x 36 to work with the Dura Ace ten speed bar end shifters and non-Dyna Sys Shimano Shadow RD.
I've compared an XT 10sp to an Ultegra 10sp. They're precisely the same width from the big cog to the smallest one. I didn't go to the extent of measuring the individual gaps, but it's safe to say they're compatible.
As another "common denominator," look around and you'll see the exact same SRAM 10sp cassettes being mixed and matched with both road and mountain Shimano drivetrains on factory-equipped bikes... there aren't two "flavors" of 10-speed PG-1050s and so forth, the same one is compatible with both road and mountain. If Shimano's 10sp mountain cassettes were, in fact, laid out differently, then SRAM would have to have two types of their 10sp cassettes in order to be Shimano-compatible.
In regards to "oh noes, not ANOTHER new cable-throw pattern," I think DynaSys's increased cable travel is beneficial to the intended use, just like SRAM's 1:1 setup:
1. Full-suspension bikes flex the piece of cable housing that links the frame to the rear swingarm, and that can be enough to cause ghost-shifting. Increasing the cable travel makes that proportionately less critical.
2. Mountain bikes tend to get contamination in the housings, and increasing the cable travel can reduce the impact of the cable not wanting to move that last 1/4 of a millimeter into its intended position due to contamination.