Ok I have made my plans clear in another post that I was going to mod a CBR125. A key mod was to over size tyres which seem to light up the netrider community. "it will effect the handling", "you will adversely effect the bike", "they make the tyres that thin for a reason" Blah.. obviousley none of these people have tried an over size tyre on their bike. I did.. I first took it out unknowingly with only 10pounds of pressure. It was sloppy to lean into turns but stuck to the road and made for very smooth riding, you just had to man handle it a little more then usual. Then not knowing how much to put in I pumped it up to 35pounds so that it was standing tall. It now handles sharp but you can feel every bump in the road. The bike wiggles under hard accelleration and doesnt feel as stuck to the road as it did before. I should have my camera back next week and I will film just the tyre under both conditions for consideration. The tyre (i think) is 140/60/17 and should be a 120/70/17 My conclusion is over size = over pressurized, but as for these major impacts on handling... I dont think so. I will test 0-100kmph times short uphill twisty run times stop distances Your 2cents please? any suggested tests when I have camera mounted?