legacycentral bbs

hi group,
brain teaser.......
question... My RS Liberty runs std wheel/tyre combo of 205/60 15. To go to 16" rims the correct size would be 205/55 16.
Trouble is with the cars load rating of 91 there isn't much choice in tyres.
In the Wheels magazine road test, back in1992, the speedo error on the RS was 5.2% out, reading slower than the actual speed, eg, 80km/h on the speedo was true speed of 76 km/h.
If I go to 215/ 55 16 then by my calculations, the speedo error would be 2.5% slower than the 205/60 15, std.
So overall, if the std setup is 5.2% slower and I increase tyre/wheel size to 215/55 16, then I have decreased the error, 5.2% less 2.5%.
So now my speedo error is only 2.7% slower.
80km/h would now be a true 78km/h.
In actual fact I have made the speedo more accurate.......
Do I have this right?
Rod.




<http://rd.yahoo.com/M=201621.1431180.30 ... yahoo.com/>
<http://us.a1.yimg.com/us.yimg.com/i/space.gif!>
www.
<http://us.adserver.yahoo.com/l?M=201621 ... =987409259>

To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com



zZz <http://docs.yahoo.com/info/terms/> .

All speedo's will read slightly different (most manufacturers make
the speedo slightly pessimistic) The way to test what speed you are
actually doing when your speedo says 100 is on a dyno.

My car when showing 100Km/h on the speedo was actually doing 98.97Km/h

Dan


--- In BC-BFLegacyWorks@y..., "Rod" <melrod@o...> wrote:
> hi group,
> brain teaser.......
> question... My RS Liberty runs std wheel/tyre combo of 205/60 15.
To go to 16" rims the correct size would be 205/55 16.
> Trouble is with the cars load rating of 91 there isn't much choice
in tyres.
> In the Wheels magazine road test, back in1992, the speedo error on
the RS was 5.2% out, reading slower than the actual speed, eg,
80km/h on the speedo was true speed of 76 km/h.
> If I go to 215/ 55 16 then by my calculations, the speedo error
would be 2.5% slower than the 205/60 15, std.
> So overall, if the std setup is 5.2% slower and I increase
tyre/wheel size to 215/55 16, then I have decreased the error, 5.2%
less 2.5%.
> So now my speedo error is only 2.7% slower.
> 80km/h would now be a true 78km/h.
> In actual fact I have made the speedo more accurate.......
> Do I have this right?
> Rod.


To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com

http://miata.net/garage/tirecalc.html

It may be on the Miata.net page, but it applies to just about everyone i can
think of that has a tyre on their car. =) You input what your stock size is
and what size you're going to, and it tells you the margin of error on your
speedo.

-Jason


>From: "Rod" <melrod@optusnet.com.au>
>Reply-To: BC-BFLegacyWorks@yahoogroups.com
>To: <wrx@yahoogroups.com>, <BC-BFLegacyWorks@yahoogroups.com>
>Subject: [BC-BFLegacyWorks] tyre size /speedo
>Date: Thu, 24 May 2001 22:26:18 +1000
>
>hi group,
>brain teaser.......
>question... My RS Liberty runs std wheel/tyre combo of 205/60 15. To go to
>16" rims the correct size would be 205/55 16.
>Trouble is with the cars load rating of 91 there isn't much choice in
>tyres.
> In the Wheels magazine road test, back in1992, the speedo error on the RS
>was 5.2% out, reading slower than the actual speed, eg, 80km/h on the
>speedo was true speed of 76 km/h.
>If I go to 215/ 55 16 then by my calculations, the speedo error would be
>2.5% slower than the 205/60 15, std.
>So overall, if the std setup is 5.2% slower and I increase tyre/wheel size
>to 215/55 16, then I have decreased the error, 5.2% less 2.5%.
>So now my speedo error is only 2.7% slower.
>80km/h would now be a true 78km/h.
> In actual fact I have made the speedo more accurate.......
>Do I have this right?
>Rod.

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com


To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com

The important thing is gearing. Smaller tires will give you better acceleration. Are you really worried about 5% error???
If you get caught speeding at 40km/h over posted, you are still in trouble...(hehe)

Mark
www.rrunracing.com <http://www.rrunracing.com/> .

At 10:26 PM 05/24/2001 +1000, you wrote:


hi group,
brain teaser.......
question... My RS Liberty runs std wheel/tyre combo of 205/60 15. To go to 16" rims the correct size would be 205/55 16.
Trouble is with the cars load rating of 91 there isn't much choice in tyres.
In the Wheels magazine road test, back in1992, the speedo error on the RS was 5.2% out, reading slower than the actual speed, eg, 80km/h on the speedo was true speed of 76 km/h.
If I go to 215/ 55 16 then by my calculations, the speedo error would be 2.5% slower than the 205/60 15, std.
So overall, if the std setup is 5.2% slower and I increase tyre/wheel size to 215/55 16, then I have decreased the error, 5.2% less 2.5%.
So now my speedo error is only 2.7% slower.
80km/h would now be a true 78km/h.
In actual fact I have made the speedo more accurate.......
Do I have this right?
Rod.





<http://rd.yahoo.com/M=201903.1443829.30 ... yahoo.com/> Yahoo! Domains <http://rd.yahoo.com/M=201903.1443829.30 ... yahoo.com/> Yahoo! Domains


<http://us.adserver.yahoo.com/l?M=201903 ... =662573262>

To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com



zZz <http://docs.yahoo.com/info/terms/> .

Yes I know,
I am going to stick to original specs anyway, mainly because if i get caught with a flat out in the counrty, my spare needs to be the same size....... will all get too expensive buying another rim and another tyre + the i do not think it will fit neatly in the spare wheel well.
thanks.. Rod

----- Original Message -----
From: Mark Ward <mailto:mark@rrunracing.com>
To: BC-BFLegacyWorks@yahoogroups.com
Sent: Thursday, May 31, 2001 48 AM
Subject: Re: [BC-BFLegacyWorks] tyre size /speedo

The important thing is gearing. Smaller tires will give you better acceleration. Are you really worried about 5% error???
If you get caught speeding at 40km/h over posted, you are still in trouble...(hehe)

Mark
www.rrunracing.com.

At 10:26 PM 05/24/2001 +1000, you wrote:


hi group,
brain teaser.......
question... My RS Liberty runs std wheel/tyre combo of 205/60 15. To go to 16" rims the correct size would be 205/55 16.
Trouble is with the cars load rating of 91 there isn't much choice in tyres.
In the Wheels magazine road test, back in1992, the speedo error on the RS was 5.2% out, reading slower than the actual speed, eg, 80km/h on the speedo was true speed of 76 km/h.
If I go to 215/ 55 16 then by my calculations, the speedo error would be 2.5% slower than the 205/60 15, std.
So overall, if the std setup is 5.2% slower and I increase tyre/wheel size to 215/55 16, then I have decreased the error, 5.2% less 2.5%.
So now my speedo error is only 2.7% slower.
80km/h would now be a true 78km/h.
In actual fact I have made the speedo more accurate.......
Do I have this right?
Rod.



To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com



zZz <http://docs.yahoo.com/info/terms/> .




<http://rd.yahoo.com/M=190462.1393721.29 ... icated.com> www.debticated.com
<http://us.adserver.yahoo.com/l?M=190462 ... =814424339>

To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com



zZz <http://docs.yahoo.com/info/terms/> .