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Speedo adjustment...changing wheel sizes

Started by _trav_ , Jul 16 2006 10:23 AM

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11 replies to this topic

#1 _trav_

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Posted 16 July 2006 - 10:23 AM

Hi all,

Im in Melbourne..prepared to take a drive...Im just wondering if anyone here knows anyone that can adjust my speedo as i am changing my wheels from 13 inch to 14 inch?

Cheers
Trav

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#2 _Flamenco_

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Posted 16 July 2006 - 01:29 PM

You need to change the gear on the end of your speedo cable - it's in the extension housing of your transmission. The gears are plastic and are colour coded (different numbers of teeth). Tyre profile and diff ratio changes will also affect your speedo accuracy...

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#3 _trav_

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Posted 16 July 2006 - 01:47 PM

thanks for that flamenco..is hard to get to the gear??

trav

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#4 barny_lx

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Posted 16 July 2006 - 01:57 PM

go see a wrecker
Be ready to tell them new tyre size, diff ratio, gerbox etc.....

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#5 _Keithy's_UC_

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Posted 16 July 2006 - 04:54 PM

Depending on what size tyres you get, you may not have to change the speedo gear at all... Check that the overall diameter of your tyres are different before going and buying a different speedo drive that you might not need.

Keith

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#6 barny_lx

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Posted 16 July 2006 - 07:58 PM

yeha i was gonna say what keith said ! the rolling diamater may be the same.

Liek if you go from 205/60.13's or something, to low profile 15; you may find the speedo isnt out to much at all!

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#7 _devilsadvocate_

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Posted 16 July 2006 - 08:07 PM

..is hard to get to the gear??

No its not hard to get to the gear, just trace the speedo cable to the box and the gear is right on the end of the cable, youll have to unbolt it. The actual gear for the trimatics and aussie boxes is easy to replace, not so easy for a mc6.
You havent mentioned what gearbox/diff you have, it may well be that you have the tallest speedo drive in there already, in which case there may not be a speedo gear to match your increase in tyre size.
Re whether there is an increase in size or not?:
Go to http://www.powerdog.com/tiresize.cgi to check you intended tyre size diameter against that of the standard wheel size for your car, if its LH_UC closest would be 185/75/13.

Edited by devilsadvocate, 16 July 2006 - 08:10 PM.

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#8 _trav_

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Posted 17 July 2006 - 11:12 AM

yeh sorry advocate...i have a m20 box and the diff is stock with the slr's..also i forgot to say that when i bought the car the speedo was off by about 10% so i have already had it changed once but the bloke i went to has since then shut down..

The tyres on it currently are 205/60R13...i don't know tyres that well so if i wanted to put a low profile tyre on a 14 inch rim what size would i be looking at?

trav

Edited by trav, 17 July 2006 - 11:17 AM.

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#9 _trav_

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Posted 17 July 2006 - 11:21 AM

By the way devil the tyre size site you gave me is really good thanks for that

trav

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#10 _devilsadvocate_

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Posted 17 July 2006 - 11:38 AM

The tyres on it currently are 205/60R13...i don't know tyres that well so if i wanted to put a low profile tyre on a 14 inch rim what size would i be looking at?

trav

What width rims do you intend running and what performance/look are you after. If 14 x6, a 205/60 would basically give you much the same look as the 205/60/13.
Im sure others will have lots of suggestions here.

Edited by devilsadvocate, 17 July 2006 - 11:39 AM.

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#11 _trav_

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Posted 17 July 2006 - 11:43 AM

Im not going for any peroformance..just looks basically..i am going with a 7inch wide tyre...and in terms of looks i wanted to go with Eager looking type of tyre..that sporty type of look but i have ben told that eagers are not being made anymore??

trav