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edscoble-
It's wheel load ed, 80 kg - > 150 psi is for one wheel.
A 80kg rider with 55/45 distribution of wheel load would need to look up 44kg and 36kg on the chart. -
from the description bellow the chart a 80kg rider with 45%/55% front and rear load balance would need more or less 68psi at the front and 85psi at the rear
fussballclub
daveaa
8bits
yes, frank berto tyre pressure chart gives you an excellent starting point, I've used this quite a lot, clearer it's just a guide but in my opinion it's a very good one to work from and takes the guesswork out of getting it right for yourself with respect to comfort/rolling resistance.
http://problemsolversbike.com/files/blog/BQ_berto_inflationgraph_2.jpeg