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19's on a ba xt 

 

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 Post subject: 19's on a ba xt
Posted: Tue Apr 26, 2005 8:35 pm 
Oompa Loompa
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i want to upgrade my rims and i was looking at 19's now first would they fit and second would it through the speedo out
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Posted: Tue Apr 26, 2005 8:49 pm 
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yeah they should fit. plenty of room for them

your speedo could be out depends on what size tyres u get

 

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Posted: Tue Apr 26, 2005 8:58 pm 
Oompa Loompa
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why should it depend on wat size tyres i get and say if i got 235 by 35
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Posted: Tue Apr 26, 2005 9:07 pm 
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sikxt wrote:
why should it depend on wat size tyres i get and say if i got 235 by 35



the profile of the tyre...

if theres 2cm of rubber or say 4

it will create a different ratio and the speedo will be out...


19" are a big step up afaik and as long as u get low profile rubber it should be right??

correct me if im wrong but logically to me thats right

 

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Posted: Tue Apr 26, 2005 9:15 pm 
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19's will fit BA's easy, it throws out your speedo but afaik you can get them recalibrated.
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Posted: Tue Apr 26, 2005 11:25 pm 
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i was thinkin of gettin 18 x 8s, will i have to get my speedo calibrated too?
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Posted: Wed Apr 27, 2005 12:21 am 
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I had 18's on my old pulsar (cough cough rice i know :oops: )
I got caught by a copper, he got me for 74 and my speedo was saying 62/63. Sold it b4 I found out if the wheels were the cause of the off reading tho.

 

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Posted: Wed Apr 27, 2005 12:44 am 
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Ryan0001 wrote:
i was thinkin of gettin 18 x 8s, will i have to get my speedo calibrated too?


again it matters on the profile of tyres...
exp; 15' wheel with 4' of rubber; 19' stock you will have to match this with your new wheels so the bigger the rim the smaller the rubber, so that you can keep the ratio the same.
note; measurements thought of top of head :)

hope that helps...

 

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Posted: Wed Apr 27, 2005 12:47 am 
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Ryan0001 wrote:
i was thinkin of gettin 18 x 8s, will i have to get my speedo calibrated too?


nah you shouldnt have to, if you get 18's i will bring you closer to your actually speed but should push you over the limit. ie - on 15's when your speedo says 100 you will actually be doing approx 94 but with 18's at the the same speed you will me doin say 96. ive got 18's on mine and it may have jumped up a k or so.

you would only need to adjust your speedo if you increase the rolling diameter of the tyre.

having said that adr rules state that rolling diamter of a wheel must not be increased by more that 15ml of the originial specification

 

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Posted: Thu Apr 28, 2005 1:44 pm 
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mm ba spedo is done by the abs sensors in the rear wheals... so a rim/tyre change wont be a problem for the spedo!

 

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Posted: Thu Apr 28, 2005 1:59 pm 
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Disco Frank wrote:
mm ba spedo is done by the abs sensors in the rear wheals... so a rim/tyre change wont be a problem for the spedo!


Is that done from the outside of the tyre? If not and its measured from near the centre it would still affect the speedo. Wouldnt it? :shock:

 

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Posted: Thu Apr 28, 2005 4:26 pm 
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if you want to see a ba xt with 19's, check out this page!

 

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Posted: Thu Apr 28, 2005 10:48 pm 
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Disco Frank wrote:
mm ba spedo is done by the abs sensors in the rear wheals... so a rim/tyre change wont be a problem for the spedo!

A guy on one of the XR6 Turbo cruises has 19's on both his XR6T's, he said it affects the speedo.
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Posted: Fri Apr 29, 2005 12:27 am 
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Ok but how much will the speedo be out are we talking like 5-10 kays or just 1 or 2
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Posted: Fri Apr 29, 2005 1:54 am 
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Have a play with the speedo/tyre size calculator on this site

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

 

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