Without any aftermarket modifications, a stock Honda TRX450R is able to achieve a top speed of 75 mph. This performance has been remarkably consistent over the years the Honda TRX450R has been in production, despite numerous overhauls and redesigns.
The Honda TRX450R was first introduced in 2004 and was built around a single-cylinder, 449 cc engine. In later model years, the engine was redesigned for more power and less torque, which was the opposite of its original design priorities. The redesign raised the engine's displacement by 1cc, but the maximum speed held steady at 75 mph throughout the product's run.