The ETRTO 559x19 rear coaster wheel is mounted with coaster brake hub and an 18-tooth sprocket that offers great versatility for most urban commutes .It is a classical, elegant wheel that is good quality for money. The hub has coaster brake, so if you pull back the pedals the bicycle will be brake.You can mount from 28 up to 35 tyres and will need a 30mm-valve inner tube. And it is crucial you mount a rim strip between the tyre and the inner tube to reduce or prevent punctures.