no problems running them at 90 or even much less ..lets say 60 .. they do become sluggish though.( when going 60 or below )
No reason that they should loose air .... both of them ? check the valve maybe you have a small sand korn in it. than take the tubes out and hold them under water ...
The racers are very expensive ... but in my opion worth the money ( of course he says that as he sells them , somebody will chime in ) but they are almost as fast as the stelvios with loads more puncture resistance and a smooth ride to boot ...
thor
__________________
www.thorusa.com
Dahon : Freedom Unfolds
Tern : all about the ride