I'm fixing up an old bike which had a 6 speed rear setup with grip shifts. I spread the frame and swapped in a new wheel with a 8 speed cassette, and I then changed out the 6 speed gripshift with an 8 speed version.
Problem is, the cable travel on the new gripshift seems to be too much for the cassette cog spacing. In other words, one click on the grip shift appears to move the derrailer about about 1.5 cassette steps. So it only takes about five clicks to traverse the entire 8 speed cassette.
I have been under the impression that Shimano and SRAM index "click intervals" are all the same. Is that not true?
Any ideas? Thanks.