yep , unsprung weight is always an important factor , getting back to tyre pressure , all the replies are very useful info , and all opinions seem to fall into a similar range , it,ll get me into a better idea of what to try , it,s hard when your a bit on your own to get these idea,s like i have just found rimlocks that work , the rubber ones just fold up , am now using the ally with rubber back ones with great results , and they are a lower profile , great result = more than 15 minutes tube life , what,s the dunlop tyre people are using on the frount that hangs on in moist conditions