just to let you into a secret, pretty much all decnt tyres will hold air for months with them rims and a bit of sealant, iv got the stans rims on my orange, i did start off with ust tyres but then tried out a normal runber queen on the front and it held air fine, at the moment and for the last year plus iv had a conti vertical pro traction normal folding tyre on the rear. nice and fast and only about 600 grams
they roll alot better than normal tyres with tyres even if they are the same weight