I have a slightly older bike with, I believe, a 7-speed Shimano RX100 groupset. I would like to use this with a direct drive smart-trainer. Can I install an 8-speed cassette easily? :
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Shimano RX100 short cage rear Derailleur – Cycloan Education And Restorative Approaches
Shimano RX100 RD-A550 7 Speed Short Cage Rear Derailleur Vintage NOS BMX | eBay
Rear derailleur Shimano RX100 RD A550 in second hand condition