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14"to 15"Speedo Recalibrate?? 


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Posted: Mon Feb 06, 2006 7:51 pm 
Technical Contributor
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Age: 33

Posts: 4355

Joined: 14th Dec 2005

Gallery: 36 images

Ride: Fairlane

Location: Newy
NSW, Australia

ah... ok. no worries, always thought if u went bigger rims even thought the tyres have a lower profile tyre, there was still a difference. and even if it is a touch out, i would still want it fixed just incase something happens on day with the coppers going snap happy



The Lane Lives.... Finally!!!!

Posted: Wed Feb 08, 2006 10:47 am 
Getting Side Ways
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Age: 52

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Ride: PX2 Ranger 4x4 XLT Dual CAB

Location: Carrum Downs
VIC, Australia

Once again here is the link to the tyre size v's speedo calculator



She's meanness put to music and the b**ch is born to run!
Like the sign says, "speed's just a question of money. How fast can you go?"

Posted: Wed Feb 08, 2006 8:05 pm 
Parts Gopher

Posts: 96

Joined: 1st Apr 2005

Location: Melbourne
VIC, Australia

Most speedos are out by a bit anyway, in car mag road tests they always state actual speed vs indicated speed at 100km/h and even the brand new cars from ther factory are usually a couple km's out.

I wouldn't worry, might even make your speedo more acurate.
Posted: Thu Feb 09, 2006 12:13 am 
Parts Gopher

Age: 44

Posts: 59

Joined: 28th Jan 2006

Ride: XH Falcon Ute

Location: Perth
WA, Australia

Cheers all, like the website makes it easy to get a better idea in regards to a profile.

 Post subject: Wheel and Tyre size
Posted: Tue Apr 04, 2006 1:44 pm 
Fordmods Newbie

Posts: 6

Joined: 2nd Mar 2005

Ride: BA MkII XT with XR^ spolier @ 17

Location: Caloundra
QLD, Australia

I just had a upgrade from AU II SR to BA MkII XT and fitted XR6 17'' alloys.
Using tyre size calulator, when speedo reads 100 kph, over road speed is 98.7 kph, that is 1.3% difference. I dont think this is worth worring about, I doubt that the speedo has that accuracy.

Thanks for the posts it has helped me

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