Rotobox doesn’t make bikes.

At least, not usually.

Rotoxbox carbon fiber wheel at EICMA — photo courtesy of Rotobox

The Slovenian company is in the business of creating extremely lightweight wheels that it wants teams to take racing (which they do, in regional series.)

Their specialty is a custom composite of steel, epoxy and carbon fiber, a blend of strength and minimum mass. They had a sizable presence while hawking their new designs at this year’s EICMA.

Rotobox EICMA stand — photo courtesy of Rotobox

But wait.

What’s that on the left side of the photograph above? A bike?

It is indeed. A very expensive bike. And true to Rotobox’s ambitions, nominally, at least, it’s for racing.

The Rotobox Splice — photo courtesy of Rotobox

It’s called the Splice. It’s a combo Yamaha engine and swingarm and a whole lot of the carbon fiber manufacturing that they specialize in.

Rotobox (with the help of Yamaha Austria Racing Team) has taken a Yammy motocross bike, taken it down to just its engine and frame, then added a swingarm from a R6. The frame is made to accommodate either a 250 or a 450 engine.

Yamaha engine (the Splice can fit a 250 or a 450) — photo courtesy of Rotobox

Then Rotobox went to work. They added Öhlins  suspension and Brembo brakes. It goes without saying that the wheels are Rotobox, their Boost carbon-fiber with custom paint.

Rotobox Splice — photo courtesy of Rotobox

And there’s more carbon fiber to come. The instrument panel and bodywork are custom made. Rotobox also made the sprockets, triple clamps and the seat.

Custom cluster and clamps on the Rotobox Splice — photo courtesy of Rotobox

The exhaust? Same, and it gets a black ceramic coat.

Rotobox Splice — photo courtesy of Rotobox

The mudguards are 3-D printed.

In all, a wet Splice weighs in at just 263 pounds (119 kgs.) Stick a 450 cc, 60 hp motor in it and hang on.

Rotobox says the Splice is designed for supercross and motocross.

Rotobox Splice — photo courtesy of Rotobox

Which brings us back to that expensive thing we mentioned.

A Splice will set you back $40k, or £32,000.

A race team wouldn’t blink twice at spending that much on a machine and dropping it.

Everyone else? Maybe not so much.

Rotobox Splice — photo courtesy of Rotobox

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