• So...

    This week I cold-set my touring frame from 126mm to 135mm, as my wheels were knackered and I fancied upgrading from 8 speed to 10 speed.
    As far as I can tell the operation was a success (from measuring the new spacing / tracking with Sheldon's basic ruler and string method)

    I have a new 10 speed rear hub with a 10 speed cassette (all shimano Deore LX)... but am still using the old 8 speed Deore rear mech and old friction shifters.

    I can't get the rear mech to reach the biggest sprockets on the cassette... it goes to about the 8th or 9th but then stops. I have tried the limiter screws but it didn't make any difference.

    My question is:
    Will getting a 10 speed rear derailleur fix this?

    ie: does a 10 speed rear mech simply move a few mm more than the 8 speed ones? Or should this combo work anyway, and therefore it's the tracking or something else that's wrong?

    Any ideas appreciated...
    Cheers!

  • The overall width of an 8 and a 10 speed cassette are very very similar. I would look elsewhere other than the derailleur itself.
    10 speed is 37.2 mm and 8 speed 35.4 so only 1.8mm difference. (the width of an 8 speed sprocket).

  • Cheers - the extra distance I need is more like 10mm so I maybe it's just the frame.
    So (theoretically at least) the old mech should pretty much cover the distance of the new cassette?

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