I would be interested to know if this three-wheeler is drivable at the sort of speeds it can do. A wide rear tyre with a 40-series aspect ratio sounds to me like as soon as there is any body roll, the rear tyre will rise up onto one shoulder and sudden oversteer will result.
Of course, lots of guys think 'real men love oversteer' but it suddenly appearing whenever cornering fast isn't clever. I remember seeing a 2F1R three-wheeler with a similar big bike engine, intended as a cheap racing car, which had a reversed Watts linkage at the front (centre pivot on car, two ends on suspension linkages) so that it behaved as a no-roll bar - the two sides of the front suspension could only move together in bounce and no roll was possible.
