Compatible Bike TypeMountain Bike, Tricycle, Track Bike, BMX Bike - Old School, Electric Bike, Unicycle, Tandem Bike, Cruiser, Dirt Jumper, Recumbent Bike, Folding Bike, Universal, Road Bike, BMX Bike, Cyclocross Bike
I was expecting a sealed bearing set, but the bearings were visible and, although the top is protected by its location, the bottom bearing appears to be susceptible to road grime and rain as there is no bottom seal to protect it. As I avoid riding in the rain, it may be a long time before any issue develops. At the price, it was a good replacement for my worn headset.