ok how much air pressure do I need in my rear wheel for the trek down to dartmoor? the book say's 35 but iv'e left the pump run for an hour now and can only get it up to 7 ??? ................................HO SHYTE, Iv'e just noticed it reads bar whatever that means? still it looks nice and hard now, ops just spilt me jack daniels,ha well just have to open another bottle then.