:agree: with that! ButterS has laid it out very succinctly for you! :thumbup:
Anything over 20 psi is very likely too high, unless maybe you & your load weigh in over something like 600 lbs!! :shocked: . But instead of repeating what's been put out there
many many times already, I'd suggest that you simply type '
tire pressure' into the search field up the top right, tick the drop down box that says '
Search Titles Only' & hit the magnifying lens button, then settle in for some quality reading time!

. Here's one I prepared earlier, that may or may not work for you...
https://www.spyderlovers.com/forums/search.php?searchid=3294433
Sure, the results you'll get back from that search may not
ALL be about the Altimax RT43
Specifically, but it's mostly about car tires of the same size, same construction, and same sort of load range, so the pressures required are
very similar, generally within +/- 2 psi, unless you & your load weighs
A LOT, or
a tiny amount, but give or take 300+ lbs or so, the recommended pressures of about 16-18 psi for an auto tire under the rear of a Spyder is within the '
of no further benifit & largely just time wasting for most to try to adjust more exactly' range.
Over to you jbs. :cheers: