(Posted this originally inside a thread by mistake!) Help! - Got delivery of me new bike (Giant SCR 2008) t'other day and am having a problem with air pressure. The rear was already half inflated and assembled - the rear wheel I put on and pumped up - problem is (using a normal pump AND a cycleair pump) they dont seem to want to inflate above half/ 2/3rds pressure i.e. put a bit a weight on 'em and they are flat! - Is it dodgy valves?, (on both!) - any ideas?