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  1. Shimano
    I have a TREK project one that has DURA-ACE 7900 group set and i have purchased a new 7900 10 speed cassette and have a DURA- ACE 7801 10 SPEED new chain and wondering if that will be compatible?? or do i require a DURA-ACE 7900 chain which are hard to find....Thanks for your help in advance...
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