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Date: Sun, 29 Apr 2007 10:25:12 GMT
From: Paul Halliday <pjghnospamyonder.co.uk>
Subject: Re: Classic 900 - aluminum or steel/best tires for sport driving


in article 4633871F.2BA6F692nospamnospam-efitter.com, johannes at johsnospamnospam-efitter.com wrote on 28/04/2007 18:40: > However, about the science, I still think it is mostly marketing speak. > The 3 spoke wheel was obviously a convenient symbol of the turbo. There > was marketing talk that they helped cooling the disc brakes. But wait a > minute here: > > Suppose that a 'turbo' wheel on the right side is blowing into the disc > when the car is moving forward. Then imagine taking off the wheel, while > still spinning and blowing air towards the back side of the wheel. Then > take the same wheel to the left side of the car (wheel still spinning). > Mount the wheel on the left side (wheel still spinning). Which direction > will it now roll on the car? To perform the disc cooling function, it > will obviously have to roll backwards on the left :-) Hence right and > left side 3 spoke alloys would have to be mirrors of each other. If you're referring to the curly Aero wheels, then they are - the wheels are rotational. When I had a new set of tyres fitted to my set, I drove around for a day, or two, before noticing that they had the sides wrong on the front. I duly went about swapping them over and realised that my rotational tyres would then be the wrong way around. I returned to the tyre fitter and pointed out their error, the fitter pointer to the rotation lines and assured me it was okay. I tried to explain again, but the fitter kind of sniggered and went to find his Manager. They could clearly be seem laughing about it in the office and then the Manager came out to see me. He also pointed to the rotation arrows and assured me that the tyres were on the correct sides. I pointed to the rotation arrows and the wheel and he went white, then red, then yelled the at the fitter who swapped them over :) Paul 1989 900 Turbo S http://saab.go.dyndns.org/

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