I hope I'm not stating the obvious, but many cheaper rims can't cope with pressures much over 100psi.
@Platini started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I hope I'm not stating the obvious, but many cheaper rims can't cope with pressures much over 100psi.