![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? : 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? :](https://preview.redd.it/i-have-a-slightly-older-bike-with-i-believe-a-7-speed-v0-bvnypzlyv6nb1.jpg?auto=webp&s=1ba4ae592484097a08d53b4d6a105c71a4f5b79b)
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? :
![Pre-owned: Shimano RX100 (RD-A550) 7-speed short cage rear derailleur – Cycloan Education And Restorative Approaches Pre-owned: Shimano RX100 (RD-A550) 7-speed short cage rear derailleur – Cycloan Education And Restorative Approaches](https://www.ceracycloan.co.uk/wp-content/uploads/2021/01/P1010922.jpg)
Pre-owned: Shimano RX100 (RD-A550) 7-speed short cage rear derailleur – Cycloan Education And Restorative Approaches
Vintage Shimano - RX100 rear derailleur on the vintage Shimano service bench. These are basically identical to 105 1055 apart from the polished finish. | Facebook
![Classic Shimano RX100 rear Road derailleur -new, Sports Equipment, Bicycles & Parts, Bicycles on Carousell Classic Shimano RX100 rear Road derailleur -new, Sports Equipment, Bicycles & Parts, Bicycles on Carousell](https://media.karousell.com/media/photos/products/2020/6/4/classic_shimano_rx100_rear_roa_1591241096_71a90170_progressive.jpg)