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It's a matter of the valve area - no real seal there with a tube, so the air only has to get through the thin rubber of the inner tube. Tubeless tyres seal everywhere, and there's a lot more rubber to diffuse through. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ----- Original Message ----- From: "Keith Park" <topnotch@nycap.rr.com> To: <type3@vwtype3.org> Sent: Tuesday, November 11, 2003 12:29 AM Subject: Re: [T3] 5 lug T3 wheels...... > Why would a tire, with a tube in it, leak more air than one without? Seems > the tube would add extra layer for the air to get through... > > My tubed trailer tires lose only 10 lbs of air per YEAR! > > Keith > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org