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post #1 of 5 (permalink) Old 01-21-2013, 06:29 AM Thread Starter
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solve this tire issue?

Just bought an 03 Z06. The guy put the original wheels in boxes which I got, and bought chrome aftermarket C6 style wheels---not sure brand or exact size, but currently running BF Goodrich g Force T/A tires in theses sizes:
Front: 275/35r18 Rear: 295/35r19
Using a tire calculator, this raises the front of the car 1/10th inch, and raises the back of the car 1/2 inch. There is no 19 in tire that brings the numbers back in line, it makes the gearing a bit taller and speedo a bit slow. Would you just lower the car to sit factory, align the car and take it to the track with those wheels and tires? Trying to budget, the car stung! It's harder than I thought to find stock tire sizes--only a few choices. Ideas please!!!!
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post #2 of 5 (permalink) Old 01-21-2013, 10:23 AM
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Re: solve this tire issue?

You can go with a 30 rear instead of 35, it's actually a Porsche size. With a shorter sidewall, traction can suffer, though. Not a lot of companies make it, but I believe micheline does.
Just do searches for 295 30r19, but you may have to go 305, which will fit on the 10.5 rim.
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post #3 of 5 (permalink) Old 01-23-2013, 09:15 AM
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Re: solve this tire issue?

Here are some figures i researched for myself some time ago.

size gear 1st/6500 2nd/6500 3rd/6500 4th/6500 5th/6500

stock 35/18 3.42 49.75 71.37 103.32 147.74 175.89
------ 30/18 3.42 47.53 68.20 98.73 141.18 168.07
stock 35/18 3.76 45.25 64.92 93.98 134.38 159.98
stock 35/18 4.10 42.53 61.02 88.34 126.32 150.38
------ 30/18 3.76 43.24 62.03 89.80 128.41 152.87
------ 30/18 4.10 39.65 56.89 82.35 117.76 140.19
------ 25/18 3.42 45.32 65.03 94.13 134.61 160.25
------ 30/17 3.42 45.63 65.47 94.77 135.52 161.34

I got these at dragtimesdotcom, gear calculator.
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Last edited by zteve06; 01-23-2013 at 04:45 PM. Reason: spaces, i dont do tables
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post #4 of 5 (permalink) Old 01-24-2013, 03:01 PM
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Re: solve this tire issue?

I'd be more worried about effecting the handling and tcs than the height of the car.

265/35-18 would fit but 275/35-18 will work for the front
305/30-19 would be as close to stock as 19" will allow and with running the larger 275 front, will look better than 295 too.

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post #5 of 5 (permalink) Old 01-26-2013, 03:17 PM Thread Starter
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Re: solve this tire issue?

I guess there's more clearance under these cars than I thought. Damn winter, it would be handy to go to cruise-ins and see what other guys are doing, how they look. And yes, the main reason for worrying about the height is the handling.
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