What Is an SR1?
An SR1 is a R1 powered UTV spec class. The SR1 UTV Class was developed and created by Weller Racing in 2009 as a result of a growing need for an exciting drivers class in the UTV division of off road and short course racing.
Realizing a growing need for a fun and much faster class of racing, Weller Racing developed an economical way to transplant a Yamaha R1 street bike motor into most pre-existing Pro/Mod race Rhino chassis, without the need for extensive modification.
Another recent addition due to high demand has been the development of the production Weller Racing SR1 base center frame, which has solved the issue of long waits for backordered frames and increased costs from the factories.
With its high HP motor, six-speed manual transmission, two-wheel drive handling characteristics and strict specifications, the SR1 is not only a fun, powerful and challenging class for drivers, but it is also exciting to watch.
Our goal is to keep each SR1 very similar (much like a spec class) in power and handling in an effort to keep the racing action close and to prevent the class from becoming a money and horsepower contest.
Start with the specs and rules. If you’re building or buying a car, lock in compliance first—then chase setup and seat time.