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the right tyres? 

 

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 Post subject: the right tyres?
Posted: Wed Jun 08, 2011 11:29 am 
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Age: 32

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Ride: Au1 Fairmont

Location: palmerston
NT, Australia

i've recently put a set of 16 inch rims on my au1 fairmont and the tyre specs are 225/55 r 16s. I bought them off a mate who said there would be no dramas on having them on the car. But recently another friend has told me they're the wrong size and i shouldn't have them on as they will compromise handling and i've noticed it doesn't handle as well in the wet anymore(there is plenty of tread on the tyres). Any advice on this subject would be greatly appreciated!
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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 11:45 am 
Getting Side Ways
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Whats the wheel width?

 

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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 2:34 pm 
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i'm pretty sure that the width is 225
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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 2:42 pm 
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ur friend is a twit!

MITCHY

 

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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 3:48 pm 
Getting Side Ways
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Ride: 1993 EB XR8

Location: BrisVegas
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225/50 R16 is the factory 16" size.

 

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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 4:16 pm 
Getting Side Ways
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67RCE wrote:
225/50 R16 is the factory 16" size.


So theyre an 8" rim? or a 7"?
225/55 means you have a ~25mm larger rolling diameter than with a 225/50. Meaning your speedo is out, not sure about legality with larger rolling diameters?

 

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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 4:35 pm 
Getting Side Ways
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the sam wrote:
67RCE wrote:
225/50 R16 is the factory 16" size.


So theyre an 8" rim? or a 7"?
225/55 means you have a ~25mm larger rolling diameter than with a 225/50. Meaning your speedo is out, not sure about legality with larger rolling diameters?


Factory 16" alloys are a 16x7.

 

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ILL60 - EF XR8, Sunroof, Ticky Kit, 19x8.5/19x11 TE37's, 347, AFr185's, TFS BoxRcustom converter, Hurst Quarterstick, huge billet cam.

51TER - DL LTD. Stock.

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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 4:37 pm 
Getting Side Ways
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So, tyre width is fine. But sidewall is too large.

 

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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 4:44 pm 
Getting Side Ways
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for factory AU1. AU 2/3 are different. I'll confirm the difference when I get back to the office, as my boss has an AU 3 Fairmont with factory 16's

 

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ILL60 - EF XR8, Sunroof, Ticky Kit, 19x8.5/19x11 TE37's, 347, AFr185's, TFS BoxRcustom converter, Hurst Quarterstick, huge billet cam.

51TER - DL LTD. Stock.

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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 5:16 pm 
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On my AU1 the factory size was 215/55/16 from the placard. Fairly sure I have 225/50/16 currently on my car and my speedo reads higher than what it should.

 

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Last edited by skidder on Wed Jun 08, 2011 5:41 pm, edited 1 time in total.

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 Post subject: Re: the right tyres?
Posted: Wed Jun 08, 2011 5:20 pm 
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Location: Narellan
NSW, Australia

Hi Au1Sam, I have the same issue with Tickford shark fins on my XH. The original tyres are 195x75x14 or 205x60x15 and the option for the 16inch wheel is 222x50 x16. By using the link below you just put in the size of tyre that you either have or are looking at and it will give you all of the necessary specs. You can also put in what is supposed to be on the vehicle and what you would like to have installed and it gives a comparison in relation to run out and even the difference in speed readings. I have found that the 225x50 x16 are too small and I have always thought that the engine was revving a bit too high at 110km/h on the motorway. I have since found out a better size to put on that will be comparable with the original tyres. Try it and see how you go.


http://www.exploroz.com/Vehicle/Tyres/SizeCalc.aspx

Cheers, AU055
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