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I have reached out to BFG and Kumho for comments on running tires at say 20-25psi for extended periods in 30degC temps at low speed - will see what they come back with. Coopers publish a 6psi reduction reduces load rating by 20%. This is due to increased temps from wall flex. I am sure there is adequate tolerance in the 121's but just need to see if anyone has any facts around this they have found.