Tire Size Help - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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post #1 of 10 (permalink) Old 11-15-2012, 05:43 PM Thread Starter
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Tire Size Help

I just bought some 17x9.5 and 18x10.5 zo6 replica rims, and i was wondering what tire sizes i should get. I have a 1994 Firebird Formula. Thanks!
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post #2 of 10 (permalink) Old 11-15-2012, 06:01 PM
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2755017 for the front not sure what the aspect for the 18 but the 315 is what i have on mine o the rear
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post #3 of 10 (permalink) Old 11-16-2012, 08:16 AM
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275/40-17 is the stock 17" size for 4th gens. I have ran 255/40-17 up front also.

Stock diameter is 25.7". Just go on tirerack and see what 18's come in a similar diameter with a width similar to your rear wheels.

Just two slow 4 doors.
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post #4 of 10 (permalink) Old 11-21-2012, 08:57 AM
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265 35 18 front, and 285 35 18 rear for no rubbing, I was a tire/wheel tech for 7 years and thats what your supposed to run. you can get away with a 295 or 305 35 in the back but the front you gotta be careful. 255 35 18 if you can find em, but you got 9.5 inch wide wheels so you might be stuck with using a 265 or probably a 275 35 18 front and 295 35 18 rear. 305mm's in the back might rub

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post #5 of 10 (permalink) Old 11-27-2012, 11:24 PM
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I have 285's on the back and they rub accelerating around tight corners.


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post #6 of 10 (permalink) Old 11-27-2012, 11:25 PM
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Just FYI. I have a 95 trans am.


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post #7 of 10 (permalink) Old 11-28-2012, 10:39 AM
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Casy, where are they rubbing, inner wheel well or fender lip ? R U lowered ?? . I'm running 315/35-17's w/10.5 inch American Racing TTm's on the rear. Had to do the BFH mod and bang in about 1/2 inch of wheel well between 9:00 and 12:00 position. Also grind jounce stop bracket so it did not hit the wheel rim when jacking up by frame. I am not lowered and don't have adjustable pan hard bar. My rear is about 3/4 inch off center, left tire extends about 1/2 inch beyond fender lip and right is about 1/4 inside fender. I have about 3 inches of clearance from top of tire to fender, so I added spacer in stop bumpers to prevent tire from touching fender in abnormal conditions. Never actually felt it hitting the stops, but I don't jump off ramps with this car..
[IMG][/IMG]
[IMG][/IMG]

I'm Bob.. 1994 Z28, A4, Stall, CAI, Cam, RR's, 342 rear, LT's , CatBack, Tuned

Last edited by bobdec; 11-28-2012 at 04:46 PM.
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post #8 of 10 (permalink) Old 11-28-2012, 01:44 PM
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[QUOTE=bobdec;471812]
[IMG][/IMG]

I didn't read hardly anything in this post, but I can tell you this picture caught my attention. I love the tires and exhaust tips

95 Trans Am A4, factory 3.23s, Ram air, Phab catback, shift kit, BMR front and rear sway bars, Lakewood LCA's, UMI subframe connectors, Random Tech TA, Founder's Performance strut tower brace and PHR
99 Saturn sl2 M5, 92 header-daily driver

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post #9 of 10 (permalink) Old 11-28-2012, 02:26 PM
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Myn rubs the inside wheel well, it's only around hard corners though. it was like this when I got it but it does seem lower then normal t/a's to me. Nice car btw.


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post #10 of 10 (permalink) Old 11-28-2012, 04:45 PM
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Thanks, Cat Back is Corsa Corsa Performance Exhaust - CORSA Products Tires are Sumitomo 275/40-17 front 315/35-17 rear . Wheels are American Racing TTM 17X9 front and 17X10.5 rear

I'm Bob.. 1994 Z28, A4, Stall, CAI, Cam, RR's, 342 rear, LT's , CatBack, Tuned
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