Join Date: Aug 2010
Motorcycle: 2009 GSXR750, 2012 Yamaha R6, 2011 Ninja 250
Re: front tire size question
I dont know why they didnt do it. Could be they didnt want an issue with fender clearance. Some bikes when we put the 70 on the front make some nasty noises until the sticky goo from the labels is wore off because the clearance between the fender and tire wont clear gravel thats picked up. My guess is thats their main reasoning but it's just a guess.
Going off Dunlop Q2 specs the 120/70 is 4.83 wide while the 120/60 is 4.63 wide. The height difference is 22.8 vs 23.8 for the 70 series.
From the tires I have worked with you will have slightly more "chicken strip" with the 70 series. That means you have a little more breathing room before you run out of tire. The profile will be slightly different as well. I dont know if sidewall angles are different between the 2 but it could make a difference in profile.
Sorry but I'm not one of those really techy guys when it comes to building or fixing bikes. I look at tires, I feel suspension. I ride the bikes and work on making them feel right. Math is great but math doesnt always feel right. Some Techs work by the numbers and on paper they say things will be right. I'm just not that guy. I'm the guy at the track who starts with what I know works then makes little changes one way or another to make it better regardless of what the numbers tell me to do.
I cant give you a scientific explanation other than it works better.
I did run a 125/80 front the other day.... wow. Amazing.
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