I converted several older steel bikes to 10 speed cassette with the appropriate 10 speed chain. I have since found that the jewel like 10 speed chains wear rather quickly. I bought a RAD City with a 7 speed rear freewheel. The chain is beefy as heck and I'm finding that it is wearing much better than the 10 speed chain. I recently found out about the heavier duty chains being put on e-bikes and I suspect that is what is on my RAD. May be going back to 7 speed setups on my old steel bikes with e-bike chains.