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| Ace |
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Yeah just splurged and bought some mad 18" rims for my fairmont
Looks VERY tuff, I'll take some pics tomorow in the daytime. As for speedo calibration, will my speedo be out if I went from 15" fairmont rims with big tires (205/65/R15) to the new rims (245/40/R18) I think its 245/40 anyway, i'll double check it. Will my speedo be out? If so by how much abouts ? My brother was following behind me in his car and said when I was doing a flat 50 by my speedo, I was actually doing 48, so with the standard 5% or so calibration error, this sounds about right to me. Thoughts? |
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| Tomek |
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There was a site where u can input the sizes and everything and tells you the error..... Just cant seem to find it.
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| nannas_ed |
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from memory i think falcons have an 8k/ph difference. ie if your speedo says 100 then you will be travelling at approx. 92.
ive got 18x8 235/45/18 with no speedo adj. and its fine. all it will do is bring you a few k/ph closer to your actual speed
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| Timmeh |
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From what I've been told there will be no difference on your speedo. The 18" tyres are lower profile so the outer diameter is the same as 15" tyres. Only the profile changes.
Whack some pics up as soon as you can. |
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| fordman351 |
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Timmeh wrote: From what I've been told there will be no difference on your speedo. The 18" tyres are lower profile so the outer diameter is the same as 15" tyres. Only the profile changes.
Spot on. I never had to change my speed calibrations going from 15's to 18's. |
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| Interceptor |
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the difference is 0.88%
http://www.fordmods.com/forums/documents.php?doc=30
_________________ Banned |
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| fordman351 |
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Timmeh wrote: From what I've been told there will be no difference on your speedo. The 18" tyres are lower profile so the outer diameter is the same as 15" tyres. Only the profile changes.
Spot on, the rolling diameter of the tyre stays the same. I never had to change my speed calibrations going from 15's to 18's. I think you only have to be worried about speed discrepencies if you're going to put 21 or 22's on, but then id be worried about all the other things you would have to change just to fit 'em in the guards .
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| Disco Frank |
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mm starngte that ppl say the rolling diam is the same
BUT when i place a 225/60/15 ( as fitted to au police cars )next to a 225/15/50 ( AUI XR6) there is a hight and hence a rolling diam difference
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| insomniac |
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Age: 41 Posts: 64 Joined: 7th Sep 2005 Ride: 96 EFII Futura Stock as a Location: Melbourne |
Site for checking rolling diameter - http://miata.net/garage/tirecalc.html
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| Ace |
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Yeah the speedo seems fine.
Heres some pics, Any thoughts ? Im happy with it anyway
They look pretty shiny, but they are actually Shadow Chrome, the lip is shiny (dish rims) as it is a polished lip. Sorry bout the size of the pics, the camera makes em 800 something kb's.
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| NABAXT |
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mate they look awesome, great work, see ya went wif 18's, that extra inch makes oh so much more difference, top stuff.
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| OBS35N |
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not my cup of tea but thats just my opinion
_________________ OBS35N is gooonnnneeee.
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| Disco Frank |
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not bad not bad
needs to be lower!
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| Ace |
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lol its on superlows already!!
yeah went the whole way with 18's ... more illegal things on there 
Another plus is that they are 245's, not a chance I can get these things spinning it just wont do it 
Much safer, and much better to take off around a corner. One thing I wanna know actually, whats with Hub Adapters and why are they illegal ?? |
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| gunit18 |
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nice wheels mate. are you running hub adaptors? i need some for my TE50 wheels and am not sure if should get em.
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