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Yamaha R1 Custom "Fatty" by Speedconcepts

"Fatty," a Yamaha R1 powered custom from Speedconcepts of Milwaukee, Wisconsin. Tyson and Fatty's owner Todd Treffert, were in a Milwaukee bar late one night, talking bikes. You know how that goes, another beer or two and one of them says, "Hey, I have an idea ..." Ten months later, Fatty rolls out of the shop.

First, they picked up a used Yamaha R1, soon to be the donor for the engine and front suspension. Tyson made a frame jig and started experimenting with various designs eventually settling on the sweeping arcs of the hardtail frame. He designed a hidden suspension under the seat to make up for it.

A Ron Davis racing radiator is covered by a fiberglass shroud which makes a strong visual statement along with the tank to give Fatty a style all its own.

The pipes are routed under and around the engine but it looks like they might be, ... um, loud. Tyson used the R1 brakes and rotors up front along with the stock Yamaha wiring harness and gauge cluster, no need to change what works.

This is a street bike, it has a plate, but I wouldn't plan any long trips. Definitely a different look, but after all, no rule says an R1 engine has to power a sport bike and Tyson, as you can see, has his own rules for what a custom should look like. I think it's neat.