i pick up my refurbished 16" anthracite Speedlines tonight the place in Loughborough where I got my Toyo Proxes from (£64.50 take away) is doing tyre inflation with Nitrogen £2 a tyre. Anyone tried this, it sound good...
I've read up on it now, apparently its used in F1 and all aircraft tyres. Your tyres loose pressure at much lower rate (oxygen escapes through the rubber) the pressures stay more constant regardless of the temperature.
£25 each +£5 each for fitting tyres back on they've done a v.good job they shine more than they ever did, the colour is slightly lighter (i think, but they look bigger now wink !) Belmont Metal Finishings 01664888482 near Old Dalby between Nottingham and Melton Mowbray. They're the guys who painted my cam cover.
As an aircraft technician, I concur, nitrogen in the tyres keeps them at a constant pressure, regardless of the tyre temp. (saves the aircraft having blowouts as the wheels go from 0mph, to 150mph!)This again is something to do with the leakage rate, and the way that nitrogen, as an inert gas, reacts to heat.
Hope this helps clear things up!