FB: Bonneville Motorcycle Speed Trials
A little history, thanks to I Love Engines
This 1935 Plymouth-powered land speed motorcycle—often called the “Plymouth Monster” or Fred Luther’s Salt Flats bike—was a bold and unconventional attempt to push the limits of speed at Bonneville. Built and ridden by Fred Luther, a Chrysler employee, this machine took the radical step of mounting a full-size Plymouth inline-six automobile engine into a custom motorcycle frame.
The engine, far larger and heavier than anything typically used in motorcycles of the time, delivered substantial torque and power, turning the bike into a true mechanical oddity. Its long, stretched layout and exposed components reflected a purely functional approach—built not for style, but for one purpose: going as fast as possible across the salt flats.
Controlling such a machine was no small challenge. With immense power, limited traction, and minimal rider protection, it demanded both skill and nerve. Like many early land speed efforts, it represented a time when innovation often meant experimenting far beyond conventional boundaries.
Today, Fred Luther’s Plymouth-powered motorcycle stands as a fascinating piece of speed record history—a symbol of early American ingenuity, where creativity and courage combined to chase new limits on the open salt.
Robert Miller added…. It's in the national motorcycle museum, and it went 180 mph before it threw a rod. He was after the 200 record for a payout of $30,000
Franklin Ratliff added that the Skids under the rider's feet…. were the brakes....
If you know more… let us know.