jimc wrote:
Heh.
Road camber has eff-all to do with tyre wear on motorcycles - or cars - or MP3s! Tyre wear occurs only on acceleration. That means positive or negative acceleration, from foot to the floor, braking or cornering.
Duff camber or toe-in is the usual culprit on cars (and MP3s), (occasionally caster is the culprit) - on a 2-wheeled motorcycle it's about vehicle (not road) camber only - how the wheel is centered vertically wrt the frame and main body mass.
Someone who normally rides with their bum slightly to one side could cause uneven side-to-side tyre wear on a motorcycle.
Road camber (which is normally minute, and anyway m/c riders tend to ride nearer the centre of the road) is a total red herring. Far more wear occurs on the sides of the tyre each time you take any sort of curve in the road.
With greatest respect we will have to agree to disagree on this. There are far too many variables at play to be dogmatic.
Tyre construction - MP3 uses scooter tyres which are not design for MP3 front wheels.
Riding style (lean angles, cornering speed, braking technique etc.).
Road condition and type for riders typical journeys.
Laden weight.
Tyre pressure.
Design compromises and manufacturing variations in all of the geometric factors you list.
I don't think uneven tyre wear is something to get too concerned about unless it means changing front tyres at a ridiculously low mileage. Especially when a hard ridden MP3 will go through rear tyres in 3 to 4 thousand miles.