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Tire Size & Speedometer Correction - Evidence
- Thread starter MarkLawson
- Start date
Actually, the statement about 'rubber on the ground' is incorrect. On the same vehicle at the same inflation pressure, all tires put the same amount (area) of rubber on the ground. 500 pounds setting on a tire inflated to 28 psi will generate a contact patch of 27.14 sq in, regardless of whether the tire is 250 mm wide or 180 mm wide. The difference will be the way the contact patch is aligned relative to the direction of travel. The tire with the greater width will have a contact patch which is wider and shorter than the narrower tire.
BLUEKNIGHT911
Sadly Passed Oct 2024 - RIP
I DON'T THINK SO
Dan I beg to differ on this .......50 vs. 60 is the aspect (?) ratio ....it has nothing to do with the tire diameter.........:hun:.....:2excited:....:thumbup::thumbup::thumbup:...Mike
Dan I beg to differ on this .......50 vs. 60 is the aspect (?) ratio ....it has nothing to do with the tire diameter.........:hun:.....:2excited:....:thumbup::thumbup::thumbup:...Mike
MarkLawson
RT-S PE#0031
I don't think you're understanding the point of my post. With the different tire installed, my speedometer is now running true, for the most part. At some speeds it shows 1 mph different. Overall, I think this is a good change. I cannot speak to contact patch sizes, but the change in width is minimal. I have not found this tire to present any perceivable change in traction.
Actually, as I understand it, the aspect ratio measurement is based on the tread diameter. A '50' means the side height is 50% of the tread width. On a 225/50R15, that would mean the sidewall height is 112.5mm. For a 215/60R15, the sidewall height would be 129mm, resulting in a 'taller' tire than OEM.
Someone please correct me if I am wrong, which is always a good possibility...
bobnaquin
New member
I have always found it interesting that we are not allowed to adjust our speedometer reading to be more accurate. It would be easy enough to do since these are all computer readouts and there is no reason that we could not adjust the speedometer 4 or 5 miles per hour since it is pretty much off that much in any case. I suppose there is some liability issues underlying it all.
I had the ability to do this on my last boat. Boats have notoriously inaccurate speedos due the design. I was able to adjust mind to being spot on with the gps. Of course there is no speed limit on the water and service intervals are determined by elapsed hours not miles travelled. It would be a nice feature to have. It would not be any harder than adjusting the time of day clock.
I had the ability to do this on my last boat. Boats have notoriously inaccurate speedos due the design. I was able to adjust mind to being spot on with the gps. Of course there is no speed limit on the water and service intervals are determined by elapsed hours not miles travelled. It would be a nice feature to have. It would not be any harder than adjusting the time of day clock.
NancysToy
Motorbike Professor
The reason probably has more to do with the odometer laws. Changing the speedo means also changing the odo. It is perfectly logical that to do so makes things more accurate, and should be allowed (or even desired), but since when did Congress worry about logic?
BLUEKNIGHT911
Sadly Passed Oct 2024 - RIP
AND I THINK
( Aspect Ratio )..... And I think it's in reference to the sidewall height combined with the tread width.....Mike :thumbup:
( Aspect Ratio )..... And I think it's in reference to the sidewall height combined with the tread width.....Mike :thumbup:
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den1953
New member
Aspect Ratio
I always thought the Aspect Ratio had to do with the height of the sidewall relative to the tread width. Say a 70 series tire might have a sidewall height that is 70% of the tread width and a 60 series would be 60% etc. At least that was always my interpretation of it.
I always thought the Aspect Ratio had to do with the height of the sidewall relative to the tread width. Say a 70 series tire might have a sidewall height that is 70% of the tread width and a 60 series would be 60% etc. At least that was always my interpretation of it.
Bob Denman
New member
My question: Have you noticed any difference in the handling of the bike with the narrower tire? :dontknow:
And for those of you; who want to have some fun with numbers...
http://www.tacomaworld.com/forum/tirecalc.php
And for those of you; who want to have some fun with numbers...
http://www.tacomaworld.com/forum/tirecalc.php
From the Tire Rack:[h=3]"Sidewall Aspect Ratio[/h] Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.
P225/50R16 91S
The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall."
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=46The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall."
BLUEKNIGHT911
Sadly Passed Oct 2024 - RIP
MEA CULPA, MEA CULPA
OldCowboy you are correct ......after re-reading my second Post I realized my error and corrected it .........Mike :thumbup:
OldCowboy you are correct ......after re-reading my second Post I realized my error and corrected it .........Mike :thumbup:
MarkLawson
RT-S PE#0031
I have not found this tire to present any perceivable change in traction or handling. As the original post is several months old, I doubt the HydroEdge is easily found. I put Michelin Defenders on the front, which I understand is Michelin's replacement for the HydroEdge. The Defenders seem to work well up front.
Bob Denman
New member
Thanks! :thumbup:
