Wuz up everybody..... i'm replacing my tires pretty soon, and you all should know that the front comes w/ a 120/60 series. Well i'm just wondering if any of you have changed to a 120/70 series, if so how does the bike feel and if you guys recomend the tire upgrade or not. Ive heard it gives more stability but slows monovering down a bit and is not as secure as the original tires. Thanx for the feedback...

120/70 gives you better front end feel but the tyre will be taller, may foul the front mudgaurd and radiator as it grows at speed. the forks will need dropping through the yoke to give the same steering geometry to. a good idea but not as simple as it looks.

You always want to measure your tires before and after you change them. Even though they will be listed as the same size, 120/70 the profile of different brands gives you different size tires. Always measure the circumference of new tires and old tires and adjust the forks in relation to the trees. Generally you'll only have to change by like 5mm.
Don't worry about you fender. I have yet to see a street tire grow enough to rub on the fender. Not even on track tires, and the rad, that's only going to be affected by the tire if plow into something and bend the forks back. You have like 3-4 inches of clearence between the wheel and the rad.
I wouldn't switch to the 70s though. Stick with stock sizes unless you plan on racing/track riding and are looking for an advantage. The average rider can't tell the difference between tires, stability, feel, you name it.

You always want to measure your tires before and after you change them. Even though they will be listed as the same size, 120/70 the profile of different brands gives you different size tires. Always measure the circumference of new tires and old tires and adjust the forks in relation to the trees. Generally you'll only have to change by like 5mm.
Don't worry about you fender. I have yet to see a street tire grow enough to rub on the fender. Not even on track tires, and the rad, that's only going to be affected by the tire if plow into something and bend the forks back. You have like 3-4 inches of clearence between the wheel and the rad.
I wouldn't switch to the 70s though. Stick with stock sizes unless you plan on racing/track riding and are looking for an advantage. The average rider can't tell the difference between tires, stability, feel, you name it.
This is an old thread, but do you still sugest sticking with the stock sizes? Same question as CarlitosR6, I can get Michilen PP's 120/70 fronts for cheap and I was wondering if I should go with the larger front profile?

i changed to pilot powers from the standard Dunlop D208's and kept the 60 profile on the front, I am perfectly happy with the way the bike handles.

I might try a 70 profile one day, but to be honest, 'if it aint broke then dont try to fix it' is my motto. :twisted:
Good Luck!

After talking to the guy he said he can get me a 120/60 so I'm gonna stick with the stock size. Like you said, If it aint broke then dont fix it!

Basically switching to a 70 series profile makes the tire taller and more triangular as you look at the center of the tread to the edges. This quickens steering because the tire wants to fall over to either side naturally now. But the steering quickness comes at the expense of straightline and slow speed stability. This is the category that gets used most during street riding.

So as I said before, the average street rider won't know the difference. But with that being said, why change to a different size and profile tire that has different performance characteristics when you don't need them.