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Get the 70 series. It is a bit taller and may make the bike turn slightly slower, but you can make adjustments for that. The 60 series are stiffer and more prone to chatter in corners, and you can not get good race rubber in that size.
 

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Stick to the 120/70 and drop your front forks by 4mm if you want to stay conservative. If you want it to be the same as it is now, then take the radius of the old tire and the new. The difference between them is the amount you will want to drop the front forks.
 

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Discussion Starter · #5 ·
Thanks guys for the info. Oh ya I just picked up a 03 636. need front tire should I go with the 70 or 65 [?]
 

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You should try em both to get the feel. For 20K miles I rode with the 70 profile, then just recently, I switched to 60s. My front chicken strips has been obliterated. I like them better because I feel I have more control on them.

60-more contact patch in the middle
70-more contact patch on the sides.
 

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Originally posted by Ernie
Get the 70 series. It is a bit taller and may make the bike turn slightly slower, but you can make adjustments for that. The 60 series are stiffer and more prone to chatter in corners, and you can not get good race rubber in that size.
I always felt that the 70s turned faster. Yea the 60s chatter like a mofo at full lean.
 

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The 70s have a taller profile and will have the same effect as dropping the forks through the triples. This effect will increase the rake angle and slow down steering and increase stability. The 60s cause a chatter because the steering has been quickened up from stock and causes a increase in front end instability. Both 70s and 60s are fine depending on whether or not you like their profiles. The 70 on a 3.5 rim will give a rounder profile compared to the 60 on the same rim. Either way, the forks should be moved from stock unless you plan on using a 65.
 

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i just picked up a 65 series pilot power cause i didnt wanna mess with my forks. plus im used to riding on a 65 so i didnt wanna change it.
 
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