Miss thumb shifters? Converting a drop bar bike to flat bars? These easily transform bar end (aka barcon or TT) shifters into thumb shifters. The shifters are not included, but are readily available in 8 through 11-speed versions, and many have an option for friction-shifting.

These ones clamp onto a 26mm handlebar, which isn’t that common. You might want to find a 22.2 or 31.8 set instead? #bitgooby