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Re:Speedometer and Tire Size

To: "Bob Danielson" <rdaniels@snet.net>, "Triumph" <triumphs@autox.team.net>
Subject: Re:Speedometer and Tire Size
From: Bud_Rolofson@nps.gov (Bud Rolofson)
Date: Tue, 10 Aug 1999 10:42:31 -0400
Bob

I've got 205/70/15 Yokohama MD-H4s on my TR6.   Got em at Tire Rack on close out
for $46 each which was a steal.  I bought five so I'd have an extra (I can
always find something else for a spare if I have to use it on the car).  The
size difference only makes it read a hair faster on the speedo than what I'm
really going which might keep me from ticket...naaaa probably not.   I went
through one of those "You're speed is" radar trailers at a road construction
sign on the way the VTR and it said 58 and my speedo said 60.  Pretty close
given the imprecision of both units.

I love the Yokohamas.  Big improvement in ride and handling over the Avon
redlines I had.  I probably would have spun around twice otherwise and for peace
of mind it's nice to know you have "high tech" tires when the crazies come after
you on the highways.

Thanks for taking all the pics and providing the list with updates.  I know it
was fun looking at all the pics on your website, which is a great site BTW. 
Enjoyed meeting Jean.  She's pretty cool to put up with all of us TR nuts.

Thanks again.
Bud

____________________Reply Separator____________________
Subject:    Speedometer and Tire Size
Author: "Bob Danielson" <rdaniels@snet.net>
Date:       08/03/1999 7:47 AM

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I'm currently running 185/70s on my TR6. On the trip up to VTR and back my
wife was in the family car following me, registering a very different speed
from what I was showing.... I'd be cruising at 70 only to find out it was
more like 60 - 63 on her speedometer. We had the same problem when following
VTR directions for various events that would have you zero your tripometer
and then go 4.8 miles and turn right........... even with the tripometer I'd
register a higher reading ....... maybe 5.0 instead of 4.8 miles. So I'm
guessing that I'm consistently high by 10 - 15% or so. How will tire size
affect this error? Will a 60 series (lower profile) make it worse? Going to
a 205 shouldn't matter as they're only wider.... right? I know that
re-calibrating the speedo is another answer but first I need new tires.
Thanks in advance.
Bob Danielson
1975 TR6 - current status at
http://pages.cthome.net/BobD


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