Wrapper

Okay, then my question now is if the circumference of tires are changed,
will speedo recalibration be necessary?.

"Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
news:327f7$452be1f6$44a4a10d$22193@msgid.meganewsservers.com...[color=blue]
>
> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message news:...[color=green]
>>
>> "Dennis Leong" <spgdxl@berkeley.edu> wrote in message
>> news:eggn1l$16rd$1@agate.berkeley.edu...[color=darkred]
>>> 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.[/color]
>>
>> 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)[/color]
>
> 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]