80mm diameter roller drum provides moderate resistance without the need for an exterior resistance unit. Sliding frame with quick release mechanism allows length adjustment in the range of 950mm-1180mm. Suitable for bicycles with long wheelbases such as 29` MTB and full suspension frames. Equipped with an easy to read gauge that allows you to go from storage to use length without guesswork. Included non-slip rubber step for ease of use and safety when boarding and disembarking. Constructed of rust-resistant and lightweight aluminum