tires - Vintage Mustang Forums

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post #1 of 7 (permalink) Old 04-14-2017, 10:35 AM Thread Starter
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tires

OK, just ordered new tires and wheels for autocross. Let's just say my street tires didn't cut the mustard. The biggest headache was determining if I wanted a 235/45 all around, or a 235/45 in the front and 245/45 in the rear (66 coupe, rolled fenders, 17X8's/4.75"BS). With regards to racing, what size tires are you running and why? I'm not rich, so my logic is the ability to rotate the tires may allow me to run 2 seasons vs having to purchase only two tires as they wear (better use of limited funds). What is your approach when it comes to tires?
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post #2 of 7 (permalink) Old 04-14-2017, 11:33 AM
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I always run a square setup on track tires of any type for the exact reason you mention.

Regards,
Patrick
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post #3 of 7 (permalink) Old 04-14-2017, 11:41 AM
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OK, just ordered new tires and wheels for autocross.
You're asking after you already bought them? Fortunately I agree with Pat- same size front and rear so you can flop them around if needed. You can also get by with 1 spare tire instead of 2. A wise choice you have made

Buckle up- I wanna try something!!
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post #4 of 7 (permalink) Old 04-14-2017, 11:55 AM
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Another excellent point. To add to that, I always found it easier to dial in a square setup...pressures, alignment settings and so forth...at least for me.

Regards,
Patrick
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post #5 of 7 (permalink) Old 04-14-2017, 12:15 PM Thread Starter
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I'm brand new to this so I'm trying to listen to those individuals that have done / are doing this. Major learning curve here. Thank you on the note regarding setup and balancing the car, that completely makes sense.
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post #6 of 7 (permalink) Old 04-14-2017, 02:31 PM
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Square. I run Open Track and can imagine cording a tire in a weekend or two if I couldn't rotate them (with race tires we'll swap them from side to side to maximize the life of all).

Spare tire? What is this of which you speak?!!
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post #7 of 7 (permalink) Old 04-15-2017, 07:46 AM
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I would advise going square for several reasons.

1) You are getting quite past the 1.1X the width of the rim (8"=225) rule of thumb - which in hard cornering makes the sides of the tires no longer parallel leaving the inside pulling tread off the road. Think about it /_______\ what happens when you side load that setup. If you have flairs and can fit a larger tire, go with wider rims!

2) If you were going to stagger based on performance, likely larger tires on the front would be in order as there is more weight on front, now that would look stupid and not be great for launch - consider this an academic thought process - although I knew an autocross national champion that ran larger tires up front on his later model camero...

3) If you want to go wide in the rear, your car will push - you can add an adjustable rear swaybar to fix that if you want to wider rears for launch but you will have to dial that setup in.

4) rotating tires for life span...

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