by macx » Mon Jul 26, 2010 9:53 pm
To add to the problems of small wheels / tires, think of the wheel bearings.
The smaller the tire, the faster it goes around at any given speed so the faster
the wheel bearing spins - not to mention small wheels have smaller bearings to
start with.
So, "real" highway speeds for any distance are taking a chance.
I converted an old boat trailer (shortened the tongue), put a dropped straight
axle from the back of a mid size front drive car under it (widened the axle),
added some overload springs, and now I've got 15" tires on car hubs and bearings.
I've built a cargo box for it and have hauled pretty heavy loads long distances
at near 80 mph quite a number of times. No problems.