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| The Pub For General Automotive Related Talk |
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31-10-2005, 04:23 PM
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#1 | ||
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Regular Member
Join Date: May 2005
Location: Greensborough
Posts: 172
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Hey just wanted to know if i put 18inch wheels on my au if it is going to mess around with the speedo?
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31-10-2005, 04:50 PM
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beep beep
Join Date: Dec 2004
Location: Melbourne
Posts: 1,971
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depends on your how you change the profile of your tyre.
Example: You currently have 225's at 60 profile. That means the sidewall is 135mm high. On 16" alloys, this means that you have (16"*25.4)/2+135mm = radius of your wheel. Means the radius is 338.2mm. Going to 18" wheels... you want to keep your radius at say 338.2mm to remain 'accurate'. Just work the maths backwards. (18"*25.4)/2+x=338.2mm Solve for x: 228.6+x=338.2mm x=338.2-228.6 x=109.6mm in sidewall size. Say you are going for 18"x8" alloys, you might be looking at 245mm wide tyres. So you have 245mm*Y=109.6 Solve for Y Y=109.6/245 Y=44.74 So you can safely go for 45 profile tyres with 245 wide tyres on a 18x8 rim and maintain your speedo accuracy within a few decimal places. Not too bad eh?
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31-10-2005, 09:14 PM
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#3 | ||
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Regular Member
Join Date: May 2005
Location: Greensborough
Posts: 172
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im impressed my dad is good at maths so i will get him to work it out thanks mate
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Ford Forever! Lowndes Is No.1 |
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31-10-2005, 09:23 PM
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#4 | ||
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beep beep
Join Date: Dec 2004
Location: Melbourne
Posts: 1,971
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Tell me what your current wheels are and i'll let you know
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31-10-2005, 09:34 PM
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#5 | ||
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Regular Member
Join Date: May 2005
Location: Greensborough
Posts: 172
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they are just the stock au cheese cutters is has on them 205/65R15 94H
i hope thats wat ya need
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Ford Forever! Lowndes Is No.1 |
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31-10-2005, 09:48 PM
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#6 | ||
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beep beep
Join Date: Dec 2004
Location: Melbourne
Posts: 1,971
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well 205 at 65 profile is 133.25mm
(15*25.4)/2+133.25 = radius Therefore your radius is currently: 323.75mm So to go to 18x8 alloys, you'd prolly want something like 40 profile on 235's (at a guess, but less find out on 235mm wide tyres. (18*25.4)/2+Y= 323.75mm where Y = profile height. Y=95.15mm So using a 235mm wide tyre, with a 95.15mm height means it is a tyre 40.49 profile (close enough to 40). So you would get 235/40R18 tyres. Or guessing if you are going 245's you'd prolly go 35's.
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Nothing to see here, move along, move along... |
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31-10-2005, 09:53 PM
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#7 | |||
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Sublime
Join Date: Jan 2005
Location: Wagga
Posts: 2,029
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Quote:
my brain hurts.........  :
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31-10-2005, 10:21 PM
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#8 | |||
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Regular Member
Join Date: May 2005
Location: Greensborough
Posts: 172
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Ok so i need to get235/40R18 tyres. i didnt quite get the next bit:Or guessing if you are going 245's you'd prolly go 35's.
Quote:
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Ford Forever! Lowndes Is No.1 |
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31-10-2005, 10:35 PM
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#9 | ||
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Silhouette AU1 TS50.
Join Date: Dec 2004
Location: Radiator Springs, Victoria.
Posts: 2,135
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Ookaay..
 _ In simple terms, 18X8 rim on a AU with either 235/40/18 or 245/40/18 will not "mess around with the speedo" that much. Do NOT go for 35 profile ( or 45 for that matter ) if you go for 245's.
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"People can have the Model T in any colour.. so long as it's black." HENRY FORD (30/07/1863 - 07/04/1947) PIC'S OF MY T1 TS50.
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31-10-2005, 10:38 PM
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meow
Join Date: Dec 2004
Location: Where the Pirates are.
Posts: 2,744
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I'm sick of posting this site up. Bookmark it peoples. :P
(half way down) http://www.fordmods.com/forums/documents.php?doc=30 |
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01-11-2005, 09:21 AM
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#11 | ||
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beep beep
Join Date: Dec 2004
Location: Melbourne
Posts: 1,971
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Decided what I had to say wasn't that important - and more a result of cuts in government education standards
 :  :
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Nothing to see here, move along, move along... Last edited by parawolf; 01-11-2005 at 09:36 AM. |
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01-11-2005, 06:19 PM
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#12 | ||
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FF.Com.Au Hardcore
Join Date: Oct 2005
Posts: 3,412
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245X40X18 will give you a rolling diameter 2 millimetres difference from your old wheels so they will not make any difference to your speedo.
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01-11-2005, 06:48 PM
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AU XR8 UTE
Join Date: Apr 2005
Location: Emu Heights
Posts: 420
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Quote:
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Current Rides:Series 11 AU XR8 Ute & Series 1 AU XR6 Sedan Extreme Big Boys Toys  www.utez.com.au Rum Runners Ute Club
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18 inch wheels and speedo
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