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Changing Tyre Diameter & Adjusting the Speedo

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zeroktrian Casual Dubber

22 posts · joined Aug 2009 ·

#829801
Hi All,

I'm looking at changing the tyres on my 65 Baja from 14" to 15", and was wondering how much of an issue I would have with adjusting the speedometer to compensate?

Do-able at home?

Cheers,

S

pod i`ve got to finish this thing one day

4,980 posts · joined Dec 2003 ·

#829803
it would have been 15" tyres to start with when a standard beetle,so maybe your speedo has read wrong all the time❓
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vwo60 Veteran Volks Folk

2,036 posts · joined Feb 2007 ·

#829810
Depends on the diametre of the new tyres, you can work out the change in the speedo reading by compairing the diametre of the new and old tyres , you can then take the speedo to a instument repair shop and they can recalibrate it to suit.

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 ·

#830039
zeroktrian wrote:Hi All,

I'm looking at changing the tyres on my 65 Baja from 14" to 15", and was wondering how much of an issue I would have with adjusting the speedometer to compensate?

Do-able at home?

Cheers,

S
Hi

The speedo is non adjustable to the home mechanic....

so, tyre sizes are the easiest way to go....

although the tyres needed to set the speedo correct may be expensive.... $$

cheers

LEE
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

zeroktrian Casual Dubber

22 posts · joined Aug 2009 ·

#830288
Hey All,

Cheers for the comments. I'm currently running 205/65/R14 tyres at what I believe to be a correct/accurate speedo reading. So presumably from what has previously been said I can use this (and potentially rim-size?) to figure out what tyre I can "transfer to" to 'keep the speedo happy'?

Cheers,

S

barls Administrator Causer of Chaos and Mayhem

9,474 posts · joined Jun 2004 ·

#830306
from memory the closest tires size to stock is 205/65/15. so with what your saying your actually undersize by about 80 odd mm in the rolling diameter with the 14 inch rims
try playing here and remember that the stock tire size was originally 165/100/r15
http://www.miata.net/garage/tirecalc.html
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