On 04/15/2014 03:15 PM, Tom Harrop wrote:
Hi Zack,

I was having problems which chain skipping and ghost shifting, which were solved when I switched from 9 to 8 speed. However, I think the spacing on a 7 speed cassette is the same as on an 8 speed (someone correct me if I'm confused). If that's true I don't know if changing between the two will help with shifting at all...?

The spacing between 7 and 8 is NOT identical.


        Center-to-center
Spacing         Sprocket Thickness      Spacer Thickness        

Shimano HG
7-speed         5.0 mm  1.85 mm         3.15 mm         

Shimano
8-speed         4.8 mm  1.8 mm  3.0 mm  


http://sheldonbrown.com/gloss_sp-ss.html#spacingk7

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