basically not much at all...
imo hp is all good and dandy, but torque is more of an impact to how the rubber hits the road. the 900 may be wheezy on hp but it's quite respectable in the torque department.
you're trading a larger contact patch for a heavier wheel and tire combo. is the additional weight noticable? doubt it. is the larger contact patch noticable? doubt it... tire compound does more for traction than dimension. does the 180 look cooler than the 160? hell yeah. i don't sweat the dimensions i just buy the cheapest tire that fits my rim... which is usually the 180/55 because it's more common; not to mention my other ride uses the same size stock, so i buy in "bulk".
that said, all the above work out just fine whether 160, 170, or 180 series... the only tire size that matters imo is the front. my advice is to stick to 120/70's on the front if the bike is anywhere near speed bumps or pot holes; because the 120/60's will give you a dinged rim. 120/60's fine for the track but not nice on the street.
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Originally Posted by LQQKR
I am curious what the benefit is of a 180 or 190 tire on the rear compared to a 160.
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