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Tire size calculation. by Paul Taylor
Started on: 08-04-2003 03:08 PM
Replies: 3
Last post by: Carrolles on 08-05-2003 08:32 AM
Paul Taylor
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From: Reading, Berkshire, ENGLAND
Registered: Oct 2002


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Report this Post08-04-2003 03:08 PM Click Here to See the Profile for Paul TaylorClick Here to visit Paul Taylor's HomePageClick Here to Email Paul TaylorSend a Private Message to Paul TaylorDirect Link to This Post
Hi all,

Hope someone can help.......

What is the stock wheel and tire size for a 85 GT ???.

I currently have 7.5J x 16 wheels, with 215/45 x16 tires.

Does this still give me the correct rolling circumfrance as stock ??
If this is wrong what tire size would i need in 16in to correct any speedo error.

Thanks in advance.

------------------
Regards,

Paul Taylor, England.
85 GT Notchback, 2.8 V6, 4 speed manual. Custom made Tubular branch exhaust manifolds with true twin 3in exhaust system. No CAT, No EGR. No Crossover pipe. ADS Road Race SuperChip & 160 deg stat. Poly bushes all round. Lowered 2 inches. 16" alloys with 225/45 rubber. 0-60mph in 5.5 sec.

www.fieroforum.co.uk/Paul85gt.htm

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Carrolles
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From: Alabaster, AL USA
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Report this Post08-04-2003 03:21 PM Click Here to See the Profile for CarrollesClick Here to Email CarrollesSend a Private Message to CarrollesDirect Link to This Post
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Paul Taylor
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Report this Post08-04-2003 03:34 PM Click Here to See the Profile for Paul TaylorClick Here to visit Paul Taylor's HomePageClick Here to Email Paul TaylorSend a Private Message to Paul TaylorDirect Link to This Post
Great thanks for the quick response !.

If the stock tire is 185/65 x14 which i think it is, then my 215/45x16 tires will only cause a 0.5mph error at 60mph.

I think i can live with that.....

Thanks again, i have saved that link for future reference.

Paul Taylor

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Carrolles
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Report this Post08-05-2003 08:32 AM Click Here to See the Profile for CarrollesClick Here to Email CarrollesSend a Private Message to CarrollesDirect Link to This Post
Just for information purposes:

There are three speedometer gears available for the Muncie 4 spd transmission. I'm not sure about other years. When I replaced the stock 215-60R14 tires on my 85SE with 215-60R15 on GT rims I changed the speedo gear to one with one fewer teeth to compensate for the larger tire circumference.

The gear is easy to replace, just be careful when removing the speed sensor from the trans case so that you don't knowk it off and let it fall inside the trans case. It is only held onto the speed sensor shaft by plastic tang on the gear engaging a detent in the shaft.

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