Hello Everyone,
I need your help, i was reading an article about 6/8 wheelers and i am curious and baffled, why is the
wheelbase measurement taken from the centre line of the front axle to the centreline of the third axle on an 8 wheeler
and presumably to the centreline of the second axle on a six wheeler. Surely it is more logical and sensible to take
the measurement to the centre line of the rearmost axle ?
Thanks & Regards
Gandy
Don’t know but I thought that the wheelbase on 6 & 8 leggers was measured on a line equidistant between the rear pair of axles, at least thats how I have seen it drawn on some sales diagrams 
gandy:
Hello Everyone,
I need your help, i was reading an article about 6/8 wheelers and i am curious and baffled, why is the
wheelbase measurement taken from the centre line of the front axle to the centreline of the third axle on an 8 wheeler
and presumably to the centreline of the second axle on a six wheeler. Surely it is more logical and sensible to take
the measurement to the centre line of the rearmost axle ?Thanks & Regards
Gandy
I think it is the reason that you need the wheelbase measuring is important, if you are trying to establish the imposed weight on a front axle or a turning circle then I agree with the article. But in general the wheelbase would be measured from the front axle centre to the mid point between the two rear axle centres.
That’s what I was thinking Mr Nut, wheelbase is to the midpoint between the two rear axles, front axle to center of the rear axle is known as Outer Axle Spread, which is how they measure 6 wheelers to see how much weight they can carry, can’t remember the exact measurements, but a 3.8m OAS would let you run max weights, but a shorter OAS like on the old Roadtrain 6x2s would only allow 22t or something like that, it was the same with 8 wheelers, as the weights went up from 26t they had to have a greater OAS than before