Old 06-08-10, 01:59 AM
  #10  
cs1
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Originally Posted by bjtesch
I've been riding with 7-speed freewheels for a long time, and 8-speed Shimano shifters. I'm sure I had checked it out back at the time but I checked Sheldon's information recently and found that the cog spacing for 7-speed and 8-speed is not identical but very close. OTOH 9-speed spacing is different so to actually go 9-speed you would need different shift levers.
5.0 mm on the 7 sp VS 4.8 mm on the 8 sp. You can get perfect shifting on 8 sp shifters with a 7 sp cassette by using the 8 sp spacers on the cassette instead of the 7 sp. That means using 4.8 mm spacers on a 7 sp
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