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"Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message news:75de8$452d792a$44a4a10d$32581@msgid.meganewsservers.com...[color=blue]
>
> "Danny G." <dandog@pacbell.net> wrote in message news:ZheXg.5205$NE6.447@newssvr11.news.prodigy.com...[color=green]
>>
>> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message news:327f7$452be1f6$44a4a10d$22193@msgid.meganewsservers.com...[color=darkred]
>>>
>>> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message news:...
>>>>
>>>> "Dennis Leong" <spgdxl@berkeley.edu> wrote in message news:eggn1l$16rd$1@agate.berkeley.edu...
>>>>> When I was hot rodding in the late '60s, I spent a lot of time researching how tire size and different differential gear
>>>>> ratios affected speedometer accuracy. I bought a lot of different speedo drive gears for the tranny (this was on a GM TH400)
>>>>> to compensate for the changes I made. All this just to keep my speedo as close accurate as possible as I didn't want to speed
>>>>> and collect tickets. Now someone tells me that after putting in larger diameter tires on his car (Honda Element), the tire
>>>>> dealer said that his speedo would still be accurate. I find this hard to believe. Are today's electronics intelligent enough
>>>>> to automatically adjust for different diameter tires? I would think at least something needs to be manually re-calibrated?
>>>>> This is a good group to get information even though this is not a Toyota specific issues. Thank you.
>>>>
>>>> If the circumference of the replacement tire's tread is the same as the circumference of the original tires, then the
>>>> speedometer and odometer will still be accurate. 2 tires can have different diameters and have the same circumference if the
>>>> aspect ratio is proportionally different. A tire's diameter is measured from the center of the "hole" to the bead, not the
>>>> tread.
>>>> --
>>>>
>>>> Ray O
>>>> (correct punctuation to reply)
>>>
>>> Oops, brain fade... Correction: A tire's radius is measured from the center of the hole to the bead...
>>> Diameter is 2 times the radius.
>>> --
>>>
>>> Ray O
>>> (correct punctuation to reply)
>>>[/color]
>>
>>
>> I thought say a 225 / 50 series tire would mean the tread width was 225 and the sidewall was
>> 50% of the tread. That also make a 225 / 50 - 15" tire shorter than a 225 / 50 - 16" tire.
>>
>> Am I mistaken?
>> Dan
>>
>>[/color]
> No.
> --
>
> Ray O
> (correct punctuation to reply)[/color]

Thanks