Date: Sun, 29 Apr 2007 10:56:26 GMT From: johannes <johsnospamnospam-efitter.com> Subject: Re: Classic 900 - aluminum or steel/best tires for sport driving
Paul Halliday wrote: > > 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/ Hm interesting, I didn't know that. My 3 spoke aero wheels are the same all round, but they're not of the curly types, just three wide bars to the rim.