There’s almost no pressure you can put into your tires that won’t blow the tires before it does anything to the rims. In other words, tire pressure depends on tire width and rider weight, and not whether the rims can take it. HED Belgium’s are stout rims that’ll take anything you dish up - they simply don’t factor into pressure calculation. For comparison, I’m 180lb and I run my 25mm tires at 100 psi. IMO 90 psi is too low for a 205lb rider on standard (23-25mm) tires