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I have 2 12-25 105 Cassettes 9sp..the plan is to upgrade to 105 10sp which I have not yet fitted. Was thinking can one convert the 9sp cassettes to 10sp because they still in pretty good shape ??? even if it's to train on...I got the 11-23 cassettes for racing..  Question


I received the new groupset today & was looking at it...However is the above possible ??Question


If not I have the option of either selling the old groupset or build another bike for the hell of it..


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Isn't the spacing is slightly different between 9 and 10 speed?  Why would you want to be swapping cassettes over? 


("Because you can" is not a good answer in this context!)

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think the 10spd chain is thinner than the 9spd,  so the 9spd sprockets would be too thick to work with the 10spd chain.


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