Quote:
Originally Posted by joe tabler

We stiil build trucks that get 12-15 miles to the gallon? Why are we making tires for bikes that only last 5-7 thousand miles? Break pads only last 5-7 thousand. It seems like poor manufacturing or inproper design for road bikes. I understand race bikes go through parts this fast. Why hasn't anyone designed longer last parts for the regular riders that ride on the street and don't have a factory sponsor?
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Well, look at the motorcycle tire shape, hence the size and shape of contact patch. Car tire is flat, so contact patch goes all the way across tire. Bike tire is rounded to allow lean and turn, so contact patch is reduced to narrow spot in the center, moving to sides when you lean. So you have about 4..5:1 increased pressure and wear. Add to this much higher power delivery to this spot (you ride 110 hp bike, and all this goes to this one spot on single rear tire), and fact that bike tires are stickier than car's (you lean to turn, it better hold and not slide). High performance car tires last 10-25k miles (depends on driver)... So you still wonder why?
My first set of PPs lasted 6k, I pushed it and at 6.5k had threads showing in the center (it happened when I went for Dragon, and I had to ride like that all the way back home). I have changed to PP2CT front/PR2CT rear. At 12.5k (6k on new set) it looks like I still have a lot of tire left, and I don't feel like I have sacrificed grip.
One other factor for longevity - it depends on the surfaces you ride on. I don't ride many concrete roads, and tarmac here is smooth, not very abrasive like in some places.