Originally Posted by
dirtbag214
2 gears in the front 10 in the back,looks like an awful lot of chain twist to me.
Not really. A 10-speed cassette is almost the exact the same overall width as 8 or 9-speed cassettes so the overall chain travel is the came.
Note to the OP: where did you get an 11x27 Shimano cassette with those cogs? Did you customize a 12x27 or is it really a 12x27? Also, Shimano's cassettes ending with 27T are all 21,24,27. Is this an aftermarket cassette?