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There's no mystery here. Liter bikes, when ridden hard, eat sport tires. But ultimately, it comes down to proper tire pressure - especially in accordance to the rider's weight.
For almost 3 years, I was wondering why the hell I was only getting 1000-1400 miles on a rear summer tire, where 80% of those miles consisted of spirited twisty road raci- er, riding (wearing out the sides before the center, in other words). Then I figured out that it was unnecessarily low tire pressures combined with my 230 lb. frame that was the culprit. See, I thought I was so fast and skilled that I needed to run 30-32 psi on the street... "need that mega contact patch cuz i'm killin it in the turns yo!". I was wrong. No matter how hard we ride on the fun roads, we simply do not attain track-like heat and load on the tires. Someone far wiser and more experienced than me suggested I raise my pressures up near Honda's recommended 42/36. I always assumed those #s took into consideration max load, i.e. with a passenger etc. Skeptical (and fearful) to go that high, I compromised at 38 rear/36 front. What a friggin difference. Took me a couple times to grab my balls and test it, but it's official: I've given up zero traction leaned over, and I've more than doubled the life of my tires. Not to mention, it has enhanced the handling and overall stability of the bike, under all conditions.
FWIW, I run Metzeler M7rr.
I run 35-35 or 34-38 depending on conditions.
I will say that the rear spins up if you aren't careful if you go above 35
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