Originally Posted by
john m flores
It is a freewheel, not a cassette. There are some but not many 7 speed freewheels still out there. The biggest I've seen is 34 teeth. So the options to change the gearing is limited unless you're willing to replace the rear wheel with a new rear cassette, new rear derailleur, and new brifter.
maybe Sunrace 13-34 freewheel (or similar) would work ?
https://www.thebikesmiths.com/produc...31611553382464
.