At what psi can I travel 65-75mph?
This Maxxis pdf has the same table. Using the table(s) above, my ST175/80R13 with 1060lbs load could run at a minimum 35psi with ~4% reserve capacity. Is there a +10lbs rule? I run with +1...
Forum Discussion
Me Again wrote:
Take one of the two LT tire sizes above and tag them with 65 mph speed restrictions and what load rating could they place on them?
Chris
I think Tireman9 answered that question in an earlier post in this thread:
Tireman9 wrote:
Now, as we all know, an ST type tire has a higher load capacity rating than a similar sized LT type tire.
ST235/75R15 LR-C is rated 2340# @ 50 psi (min) and 65 mph (max).
LT235/75R15 101/104Q LR-C is rated 1985# @ 50 psi (min) and 75 mph (max).
Since load capacity is normally a function of tire size (air volume) and its inflation. If however we also decrease the tread depth and the lower the maximum operating speed we can increase load capacity slightly.
Since some accommodation would probably have to be made to offset the increased tread depth on the LT, I s'pose it couldn't/shouldn't be allotted a capacity as high as the equivalent ST.
