The purpose of this study is to test the effectiveness of newly designed ergonomic manual wheelchair handrims called the Natural-Fit and PalmRim when compared to a new standard handrim. It is our hope that the new design of the handrims will help reduce upper extremity pain and injury, which is very common among manual wheelchair users. The Natural-Fit handrim was designed to directly address the shortcomings of standard handrims and to improve the standard-round tube handrims which were designed over 50 years ago. The PalmRim was designed for individuals who have limited hand function, making it difficult to grasp standard handrims.