SkiRideDrive
New Member
I have read through some of the posts and have some looming questions for the tire gurus. Full disclosure, I have not yet joined you guys on the track yet but am looking forward to doing so.
1. I spent some time racing/engineering on four wheels and find it hard to believe that the pressures only grow two pounds from cold to hot on a bike. (see Dunlop pressure recommendations - link) The recommendations only show a 2 psi difference for hot and cold recommended pressures. Unless the growth is only two psi from heating the tire on track the only explanation I can come up with is that the cold pressure is actually a warm pressure set after warmed by the tire warmers. Anyone care to comment? Anyone have any experience measuring the difference in pressures between cold (ambient) tires and right after pitting?
2. Especially in reference to my question above, I am very interested in the reasoning behind the vast difference in recommended pressures for the track vs. the street. At least in reference to Q2's it seems the consensus for on track cold temps is around 30f/30r. Yet the recommendation for the street seems to be 36f/42r. Are these vast differences to account for pressure growth of 6 to 12 psi due to heat (completely disagreeing with the recommended pressures discussed above), or do they just recommend a higher than optimal pressure setting for tire wear and puncture resistance? I was also curious about the front to rear discrepancy as well, but I'm guessing this is due to the potential of carrying a passenger and the higher pressure in the rear is to account for the higher load capacity.
3. Just curious about one other figure while I'm thinking about all of this. Anyone have any data on how hot tires get out on the track, either surface or core temperature would be useful.
Sorry for the length, I'm just really curious about this stuff and it helps me understand how it effects my bike.
Thank you!
1. I spent some time racing/engineering on four wheels and find it hard to believe that the pressures only grow two pounds from cold to hot on a bike. (see Dunlop pressure recommendations - link) The recommendations only show a 2 psi difference for hot and cold recommended pressures. Unless the growth is only two psi from heating the tire on track the only explanation I can come up with is that the cold pressure is actually a warm pressure set after warmed by the tire warmers. Anyone care to comment? Anyone have any experience measuring the difference in pressures between cold (ambient) tires and right after pitting?
2. Especially in reference to my question above, I am very interested in the reasoning behind the vast difference in recommended pressures for the track vs. the street. At least in reference to Q2's it seems the consensus for on track cold temps is around 30f/30r. Yet the recommendation for the street seems to be 36f/42r. Are these vast differences to account for pressure growth of 6 to 12 psi due to heat (completely disagreeing with the recommended pressures discussed above), or do they just recommend a higher than optimal pressure setting for tire wear and puncture resistance? I was also curious about the front to rear discrepancy as well, but I'm guessing this is due to the potential of carrying a passenger and the higher pressure in the rear is to account for the higher load capacity.
3. Just curious about one other figure while I'm thinking about all of this. Anyone have any data on how hot tires get out on the track, either surface or core temperature would be useful.
Sorry for the length, I'm just really curious about this stuff and it helps me understand how it effects my bike.
Thank you!