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Date:         Tue, 22 Mar 2005 06:37:48 -0800
Reply-To:     Shawn Wright <swright@ZUIKO.SLS.BC.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Shawn Wright <swright@ZUIKO.SLS.BC.CA>
Subject:      Re: Tire trivia
In-Reply-To:  <AIEFIGCNNANNIHLNFBPEMECFPJAA.mailinglist@fastforward.ca>
Content-type: text/plain; charset=US-ASCII

David,

This is interesting - I hadn't considered the odometer could be relative to the speedo. That puts a whole new twist on things. Sounds like I need to borrow a GPS one of these days.

On 21 Mar 2005 at 21:31, David Marshall <mailinglist@FASTFORWARD.CA> wrote:

> Shawn, > You are 100% right. Tires that are around 27" tall are the most accurate > for the stock speedometer. Usually the speedometer is a little optimistic > about everything. Right now on my TriStar Syncro I have 225/75R16 which are > 29.2" in diameter. The speedometer is out by 7% - when it reads 100, I'm > doing 107km/h. The odometer is out by 11% - 100km on the odometer is really > 111km - this is verified with a GPS on three separate occasions. > > The former Syncro Single Cab that I had was very accurate as I put a Jetta > speedometer into it. These need 950 revolutions to make 1km on the > odometer, where the Syncro needs 1000 per 1km. This truck had the same size > tires (6.50R16) and the speedometer and odometer were almost spot on. > > Makes a big difference in the fuel economy stats when you know the exact > distance you have travelled. > > David Marshall > > Fast Forward Automotive Inc. > 4356 Quesnel-Hixon Road > Quesnel BC Canada V2J 6Z3 > > http://www.fastforward.ca mailto:sales@fastforward.ca > Phone: (250) 992 7775 FAX: (250) 992 1160 > > - Vanagon Accessories and Engine Conversions > - Vanagon, Transporter and Iltis Sales and Importation > - European Lighting for most Volkswagen models > > > Due to the large volume of email we receive, PLEASE include previous > emails when responding. This will allow us to read the complete dialogue > in one message and will result in quicker and more accurate responses. > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf > Of Shawn Wright > Sent: March 21, 2005 8:32 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Tire trivia > > > An interesting bit of trivia for this tired of the usual "tire" thread: > > I swapped my BFG A/T KOs from my '88 to '82 Westies in preparation for > possible snow on our trip this week. I decided to measure the loaded > radius of each of the tires I have on the ground: > > Michelin XC LT4 195/7R14: 11.75" = 858 revs/mile > Yoko Y370 195/7R14: 11.75" = 858 revs/mile > BFG AT KO 27x8.5R14 = 12.625" = 799 revs/mile > > The two spares I have in 185R14 OEM size are somewhere in between the > above, but are not on the van. > > Since the speedo spec says 805 revs/mile (or 500 revs/km metric), this > means the BFGs are actually much closer to this figure that the 195/75R14 > size, contrary to popular wisdom. Interesting trivia perhaps, or maybe I've > just made an error somewhere? > > In any case, this might yield me 4mph at the same revs in my '82 Diesel :-) > ...or it could mean more time spent in 3rd :-( > > Road trip time! Back in a week or so... :-)Shawn Wright > http://zuiko.sls.bc.ca/~swright > '85 Jetta TD (retired) > '85 Jetta D > '88 Westy 2.1L > '82 Diesel Westy >

Shawn Wright http://zuiko.sls.bc.ca/~swright '85 Jetta TD (retired) '85 Jetta D '88 Westy 2.1L '82 Diesel Westy


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