eeerrrr , i`ll try , the stock tyre used to let go far to often and far to easy , even after 100 mile blast , warm road temps , she spin up when nailing it from junctions etc , and when ya got to roundabout it would just let go , no warning at all , not even on the edge , it was killing my confidence . also with the standard tyres , she`d wollow alot on long bends that weren`t silky smooth . the rosso 2 tyres , don`t do any of the above , even tho they new , you can be cranked over and have the throttle pin`d and she grips so well , its improved the stock suspension for sure , sorry for the crap right up , so here goes . the stock BT021 are total rubbish if ya like going every where flat out n cranked over as mine let go all the time , the rosso 2 , is pure perfection on that style of riding and stick like glue , plus i use the bike every day for work , so we`ll see how they are in the rain