Ackerman Spring Wheels
The Ackerman spring wheel is one of those motorcycle ideas that looks like it came out of a sketchbook after a rough ride home. The basic problem was real enough: early motorcycles had very little suspension, roads outside the cities could be brutal, and flat tires were a constant nuisance. Builders had been chasing in-wheel suspension for decades, but the Ackerman Wheel Company made the idea especially interesting for motorcycles in the World War I period.
The short version is simple. Instead of a normal spoke wheel, Ackerman used bowed strips of spring steel between the hub and rim. The strips were longer than the straight-line distance between hub and rim, so each one was already arched under the rim. When the wheel hit a bump, those bowed strips flexed and let the hub move slightly without relying on a pneumatic tire alone. That is the part that makes this more than a novelty photo in the vintage motorcycle history pile.
How the Ackerman Wheel Worked
Ackerman’s strips of spring steel replaced conventional spokes. They were fastened at the hub and attached at the rim through pintle-style pivots, giving each spring strip a little room to move as the wheel loaded and unloaded. It was not a long-travel suspension system. It was a resilient wheel: the shock was taken up by the wheel structure itself.
That matters because the pitch was not just comfort. A rider could use a solid rubber tire and still keep some of the cushion normally provided by a pneumatic tire. In 1917, when sharp stones, ruts and rough dirt roads were still part of daily motorcycling, the promise of never stopping for a flat had real appeal.
Light Wheels, Heavy Wheels and the Motorcycle Problem
Period discussion of the Ackerman design points to light and heavy versions. The lighter wheel was suited to solo machines and aircraft-style use, while the heavier version made more sense where the load was greater, such as sidecar work. The surviving motorcycle photographs most often show Indians, which makes sense for the period, but they should not be read as proof that Ackerman wheels became a normal accessory on the road.
The limitation is visible in the design. There is only so much motion available before the rim, tire and fender clearances become a problem. Make the spring strips too soft and the wheel would move too much. Make them too stiff and the comfort advantage begins to disappear. That is probably why the idea remained more fascinating than common.
Ackerman Beyond Motorcycles
The company name should be spelled Ackerman Wheel Company. The firm was not only talking to motorcycle riders. Wartime records and period advertising place Ackerman in the broader market for resilient wheels for airplanes, automobiles and motorcycles. That aviation push is important because aircraft landing gear had the same shock problem in exaggerated form: a hard landing had to be absorbed before the impact traveled into the axle and structure.
That bigger market also explains why the motorcycle evidence is so thin. Ackerman could promote one idea across several vehicle types, but promotion is not the same as widespread motorcycle production. The best evidence shows the wheel existed, was advertised and was tested or promoted seriously. The evidence for large-scale motorcycle use is much weaker.
Why It Still Matters
The Ackerman spring wheel sits in the same experimental world as other early attempts to make motorcycles work on bad roads, snow and rough country. Some builders added skis or tracks. Ackerman put the spring action inside the wheel itself. It was clever, mechanical and just practical enough to be tempting.
For anyone digging deeper, the old Hemmings spring-wheel background is still useful for the wider history of resilient wheels. The Ackerman motorcycle version, though, belongs in that narrow 1917-era window where the idea was being pushed hard, photographed well and apparently adopted only sparingly.