Shimano gears from different years!

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fossyant

Ride It Like You Stole It!
Location
South Manchester
Be careful taking it to bits, it will most likely end in tears !

8 speed shifters will indeed pull a 9 speed mech over 7 speeds. 7 speed is 3.1mm spacing, 8 is 3.0mm spacing. Will work fine.

Dura Ace 8 speed mechs/and shifter pull a different ratio so won't work unless you bodge the cable routing - they had a different pull.
 
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