Bicycle with suspension

A bicycle assembly can include a front or rear suspension system with a shock absorber. A front suspension system can be a suspension fork. A rear suspension system can include a rear shock absorber. The shock can have a shock body (96) and a pressurized main air chamber (64) within the shock body (96) to act as an air spring. The shock can also have a valve (60) configured to receive a pump for adding air to the main air chamber. A secondary air chamber (66) and a control member (68) can be used to reduce the pressure within the main air chamber (64) by venting the secondary air chamber (66) to the atmosphere.