Box Four 8 Speed Wide Rear Derailleur

Excellent

This is my second set. I bought it again because it works great. Easy to setup. Only issue it comes with a very strong clutch so it takes a pretty strong thumb to use it

Biggest upgrade ever to a kids bike

Installed on a Trek Roscoe 24in, no more chain slap. The tourney derailleurs that come on kids bikes are basically junk. The box derailleur with a clutch was a game changer for shifting on climbs and doing drops without the chain beating the heck out of the frame. Shifts are crisp. The kid won his first race right after I installed it. Sparkle watts are real.

Shifts like a dream

Running this on a 11-28t cassette and it works perfectly. Shifts great under load too.