Short guide to choosing Bicycle accessories for the Extrawheel trailer. Extrawheel trailers fit almost all bikes. The standard bicycle trailer set consists of a frame with a mudguard with or without an optional wheel, a fork/drawbar, a flag, and a standard quick-release system with a frame spacing of 135-155mm. Because different bicycles have different types of wheel hubs – for example, wide quick-release hubs, wheel hubs for full axles, rigid axles, or Thru Axles – or for when you can’t mount an adapter directly to your axle, you’ll also need an appropriate, additional adapter. All components are manufactured in Poland and are of the highest quality. 5 year warranty