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Old 09-19-2007, 05:10 PM   #1
Blue91
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03 R6 - Changing from 120/60 to 120/70 front tire. Effects?

Motorcycles Unlimited set up my suspension with the stock 120/60 front tire. I soon will need new tires and have found a great deal on a pair (front back). However, the front is a 120/70. I thought it's not good to swap tire sizes from the original size and from what was on the bike when the suspension was dialed in.

Anyone have input on this? Is it a problem? Is it no problem as long as I have the suspension "re-set up"?

Is there a positive/negative to doing this? Any forseeable issues in doing this on the 03 R6? FWIW, I'm about 185-190lb usually if it matters.

Thanks in advance.
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Old 09-19-2007, 05:14 PM   #2
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A little changes in the bike's Geometry but won't affect the street rider's performance. Won't notice it at all. Plus, it is softer on your hands from vibration.
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Old 09-19-2007, 06:50 PM   #3
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i have a 120/70 on my 03 R6 and its fine
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Old 09-19-2007, 10:04 PM   #4
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Quote:
Originally Posted by cameron1507 View Post
i have a 120/70 on my 03 R6 and its fine
Did you change the geometry at all? i.e. raise the forks in the trees or raise the rear end?
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Old 09-19-2007, 10:08 PM   #5
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I changed for a 120/60 to a 120/70 and no chages to the bike it rides the same, it does turn it alittle slower in the twisties but nothing to be worried about
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Old 09-19-2007, 10:47 PM   #6
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I think it depends on the bike. Putting a taller front will increase the trail. I tried changing to a 70 front without raising the forks. It threw the geometry way off. While riding, I had to force the bike to stay leaned over in the turns. Raising the forks 10mm helped a little but still never felt right. I ended up putting the 60 back on the front.
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Old 09-19-2007, 11:05 PM   #7
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We race (as do many, most, all?) with the 120/70, and changed from the 120/60 that we used to race with. No real changes, and that was comparing Michelin to Micheline at the time (back when they made a good endurance tire...).

If you're just commuting, with the occasional back road trip, you'll likely never notice the difference.

Sometimes, changing the brand of tire can change the geometry alone. Some brands are a little more "triangular", some taller, some a bit wider... etc.

The easy answer is that changing to the 70 may or may not make any difference. Deal with any changes as they may come, because you may have to make the changes by simply changing brands. If you're that concerned about your suspension settings, buy the same tires you have now because any changes you make may affect the suspension.

I wouldn't worry about it personally.
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