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## Re: [Tigers] Gas milage with different tires?

 To: rfraser@bluefrog.com Re: [Tigers] Gas milage with different tires? Tom Parker Sun, 4 Jul 2010 17:59:35 -0400
 ```I went scurrying to the workshop manual. The original Tiger tires were listed as 5-90x 13 with a rolling radius of 11.5 inches (Diameter 23 inches). I'm not interested in mileage necessarily, more interested in a bit more ground clearance, so I was shooting for a diameter @ 24". I could probably get some of that with new springs, but I need the tires anyway; mine are thirty years old. Either way if you go to a larger tire the speedometer will be off by a bit , but I'm sure there are shops that can calibrate it for me (Nisonger does it). Anyhow, a 22 or so inch diameter tire will run at a somewhat higher engine speed than a 24" tire. Wiki tells me C = Pi x D, so a tire with a 22 inch diameter rolls a bit more than 69 inches per revolution, a 23 inch diameter tire rolls @ 72 1/4 inches per revolution,a 24 inch diameter tire rolls a bit less than 75 1/2 inches per revolution. I'll leave it to the engineers to complete the calculations, but it would appear at first glance that going from a 23 inch diameter tire to a 24 inch diameter tire isn't going to save you a lot of gas. Tom ' 67 Mark 2 On Sun, Jul 4, 2010 at 7:28 AM, Ron Fraser wrote: > Duke > I'm not sure your numbers are that accurate. I prefer to run the > numbers using the measured circumference of the tire. There is also the > question of how accurate is your speedometer and tachometer. Measure your > tire circumference and re-calculate. The stock Tiger tire I believe had a > diameter around 23.7" so unless your buying a tire close to that size I > don't think you will see much MPG improvement from just the tires. > > I'm not sure where you can drive 78 mph all the time but here in NY > State you would be getting tickets all day long. This state is short on > money, just like many others, and one way to generate more cash is to catch > more speeders. The Police have reduced their max speed tolerance to match > the State's need for income. One speeding ticket would overshadow any MPG > savings not to mention putting a damper on the trip. Slowing down a bit > should increase your MPG. > > Ron Fraser > > -----Original Message----- > From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net] > On Behalf Of wsamouce > Sent: Saturday, July 03, 2010 11:49 PM > To: tigers@autox.team.net > Subject: [Tigers] Gas milage with different tires? > > > Hey guys, > > I am thinking about a bigger rear tire to save me some \$\$ when driving 1600 > miles to TE/AE United 2010. The Sumitomo's I have (195/60R13) are 22.4 in > diameter and 935 revs per mile. If I go to the 205/60R13, they are 22.8 > in > diameter and 914 revs per mile. I am trying to figure out if the gas > savings would offset the \$170 cost of the tires with mounting. > > I just can't get my head around the math to figure it out. I am currently > running 3600 RPM at 78 MPH (3.07 gear). I plan on running the same speed, > with cruise control, all the way to Maine. The larger tire would allow me > to run at 3535 RPM for the same speed. > > TIA! > > Duke > B382002037 > _______________________________________________ > Tigers@autox.team.net > Donate: http://www.team.net/donate.html > Archive: http://www.team.net/archive > Forums: http://www.team.net/forums > Unsubscribe/Manage: > http://autox.team.net/mailman/options/tigers/rfraser@bluefrog.com > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.439 / Virus Database: 271.1.1/2977 - Release Date: 07/02/10 > 06:35:00 > _______________________________________________ > Tigers@autox.team.net > Donate: http://www.team.net/donate.html > Archive: http://www.team.net/archive > Forums: http://www.team.net/forums > Unsubscribe/Manage: > http://autox.team.net/mailman/options/tigers/tkparker1941@gmail.com _______________________________________________ Tigers@autox.team.net Donate: http://www.team.net/donate.html Archive: http://www.team.net/archive Forums: http://www.team.net/forums ```
 Current Thread [Tigers] Gas milage with different tires?, wsamouce Re: [Tigers] Gas milage with different tires?, Steve Ralsten Re: [Tigers] Gas milage with different tires?, Dave Munroe Re: [Tigers] Gas milage with different tires?, Ron Fraser Re: [Tigers] Gas milage with different tires?, michael king Re: [Tigers] Gas milage with different tires?, Dave Munroe Re: [Tigers] Gas milage with different tires?, e.coiner Re: [Tigers] Gas milage with different tires?, Tom Parker <= Re: [Tigers] Gas milage with different tires?, Thomas Witt Re: [Tigers] Gas milage with different tires?, Ron Fraser Re: [Tigers] Gas milage with different tires?, Jim Re: [Tigers] Gas milage with different tires?, drmayf Re: [Tigers] Gas milage with different tires?, drmayf Re: [Tigers] Gas milage with different tires?, Ron Fraser Re: [Tigers] Gas milage with different tires?, David T Johnson Re: [Tigers] Gas milage with different tires?, Thomas Witt Re: [Tigers] Gas milage with different tires?, CoolVT