Changed over my tyres last night and nipped one of the tubes. The local shop only had some maxxis ultralight tubes (60g) in so thought i would give them a go. No idea whether I had a guage misreading or not, but I got to 120psi and the thing exploded. Don't think I'll use these Maxxis tubes again.
I've settled on the heavy-duty Michelin inner tubes, the ones that come in those yellow & blue cartons. The Michelin latex tubes are also fantastic on longer rides but tend to deflate rather quickly. Panaracer r-air tubes are way too delicate and the Maxxis ones are suicidal (so are their featherlight hillclimb tyres) . Stay away from Maxxis !!