Hi There. In Australia there is a statute that basically says that "thou shalt not put a motorcycle tire on a car" ...... there is
no converse statute.
@HansO was darkside when he wrote off his rocket. Perhaps
@Ishrub can elaborate.
No-one has ever questioned me at rego check time and even the pimply young man in a cockroach that gave me a hard time over a modified exhaust system and how society would disintegrate and the world would end because of it, didn't give my rear tire more than a glance.
Some people (other riders) that have never done it look puzzled but no probs otherwise. 100,000 km and just on to my third tire. Some of those K's were at ultra high speed for extended periods (using a full tank of fuel in 200 km in an hour stuff and the bike sat well and comfortable.
My wife says that the pillion ride is more comfortable and I feel that the bike rides out of corners with more confidence under noise. It takes a little while to get used to the bike wanting to be a bit directional and all but if your a bit skilled its no major hassle picking the camber of the road.
Just do it!