Date: Thu, 26 Jul 2001 00:35:16 -0500 From: "Nate t. G." <ngoddardnopsamnect.net> Subject: Re: tyre size and fuel economy
hello, its normal to lose a little economy when you go to wider tires. it makes sense when you think about it, and it goes like this. "why do you go to wider tires? more traction/better handling. how do they do that (i.e., why does wider make them do that)? better grip, more surface area. better grip/traction = friction. friction is good when you are trying to corner/take off fast/etc because it gives you more grip. but then when you are driving at constant speed, those same tires create more parasitic friction - i.e. drag." think about road racing bicycles - they use ULTRA narrow tires to reduce rolling resistance. what we need are variable traction/friction/width/grip/or-something tires that will grip better when we need it, and then less when we are just cruising along, so we can get better mileage! ;-) that would definitely be in the "better mouse trap" category! it would be an interesting concept to try/see! -- Nate t. G. '87 900 Turbo 16v Athlon 650 - NT4/W2K "VIKINGMAN" <saabnopsamlixnet._nospam_dk> wrote in message news:3Lj77.6177$Qn.500087nopsam000.worldonline.dk... > "Jeremy" <JeremynopsamVEelmc.demon.co.uk> skrev i en meddelelse > news:bpCuuIAP0bX7Ewdinopsamscott.net... > > Recently my fuel economy seems to have dropped from 22 to 17 mpg around > > town. > > > > .......... apparently coinciding with a change of tyres (and wheels) > > from 205/50 to 215/45. > > > > Is this likely to be the cause? > > > > Thanks > > Jeremy > > > > 900 v6 1997 30k > > I'd say yes. Mine has gone down by approx. 10% after I've gone from > 195/60-15 to 215/45-17. I have a 9000 2.3I 1992 250k Km. > > Cheers! > >
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