Haven't found anything about this bike here so I'm sharing what I have found...
Project built by a french prototype builder and racing company in 6months, ROADSON (http://www.roadson.fr/).
Conception: Jean-François Robert
Design: Yann Bakony
The target? Make it compact, light, very light... and fast!
The starting point? The engine, a 550 Aprilia V-twin, 33.6kg, around 21kg lighter than a Suzuki SV650 engine, that's superlight!
Around 4kg off various stuff such as a wiring loom, battery, dashboard, a catch tank.
Suspensions? Racing Paioli fork (from a GP125), 5.3kg (without the clamps) and a fully adjustable Paioli rear shock, 2.28kg.
The frame? Self-designed, built by Technitube and Meca-teck, around 3.5kg, add a pair of clamps, around 500grams.
A complete set of hand-built clip-ons and rearsets, around 1.5kg.
A full set of Beringer goodies (disc, calipers, master cylinder, brakes and clutch levers), around 4kg (without fluids, rear disc and cables).
Now let's see what we have so far...
PVM light forged wheels on racing Slick Bridestone tires (GP250 spec), new swing-arm is done (2.5kg), total weight so far including the (empty) 12liter fuel tank and a (temporary) Two Brothers exhaust is 78.5kg!
Next step, fairings are now done, with all the fairings and oil/water/various fluids, with no fuel total weight is now 96-97kg! For comparison reference, a GP250 without fuel weights 96kg...
Some more specs, bike runs on "green" E85 fuel, wheelbase is 1300mm and weight distribution is 50/50.
Time to take it on the track!
Bike is currently being tested on the track and in various races, testing various setups and geometry settings, suffering from minor problems but running great so far!!!
- Aprilia 550 V-twin
- STM slipper clutch
- Devil custom exhaust
- 4.1kg tubular steel frame, adjustable steering angle
- 2.5kg tubular swing arm
- GP125-spec 37mm Paioli fork and rear shock
- Radial Beringer brakes setup and commands
- PVM 2,5 X 17 front and 3,5 X 17 rear forged wheels
- GP250-spec BRIDGESTONE slicks, 90X17 front and 120 X 17 rear
- 1300mm wheelbase
- 12 liters fuel tank
- total weight is 97kg with water/oil/various fluids but without fuel