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Old 01-19-2006, 09:25 PM   #1
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is it ok to AutoX on 16in wheels

hi,


i was wondering if its ok to autoX on my stock tires, i have 16in



thx


P.s i just order 17in euro SVT rims.


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Old 01-19-2006, 09:36 PM   #2
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i dont see why it wouldnt be ok
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Old 01-19-2006, 09:40 PM   #3
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I don't see why not. 16's are usually lighter & tires are cheaper to buy. I'm only going with 17's cause I can't afford two sets of wheels and tires & wanted decent rims for cruisin around town.
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Old 01-19-2006, 09:43 PM   #4
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15's if you can find them, your 16's will be just fine.
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Old 01-19-2006, 10:15 PM   #5
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so 15's are better
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Old 01-20-2006, 01:08 AM   #6
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There's a trade off the smaller diameter rim you go, but most competition tires probably have stiff enough sidewalls that the difference is hardly noticeable (or you can run a lower profile tire). A smaller diameter rim will allow for less rotational mass and also lower unsprung weight (as Carrera once told me). The only trade-off is that you give up a stiffer sidewall (and you now have rubber where once was a rigid rim), which can slow down steering response and allow for more tire deformation. I don't know if it's that big of a worry, though, seeing as we're only talking an inch here.

Maybe I just put out information that wasn't necessary...
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Old 01-20-2006, 08:27 AM   #7
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Pros and Cons of 15s

Pros:
On average, they tend to be a little lighter than a 16 or 17 (comparing like wheels)
They have less inertia (easier to spin)
Tires can be really cheap (205/50-15 is a very common race tire size, for spec Miatas and Honda Challange cars)
A smaller tire will give you better gearing

Cons:
Limited in size of brakes (sorry, no SVT brakes will fit under a 15)
You'll have to buy them (assuming you already own 16s)

Personally, I love my 15s. The 16-spoke "wagon" Focus wheel is great, as its relatively light and very cheap and easy to find. And I've never had troubles finding tires in the size I need. Also, with the 50 series tire, the overal diameter is a little smaller, giving a little extra gearing for better acceleration.

If you are going to be running 17s for street wheels, the 16s will be fine for track wheels. A lot of the benefits of a 15" wheel over a 16" would be insignificant when compared to seat-time. You will go a lot faster sooner with experience and practice than seeking out the "best" wheels.
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Old 01-20-2006, 09:21 AM   #8
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Your stock 16's are fine for AutoX, just don't forget to set your tire pressures correctly at the event. You'll probably have to add more than most people with the racing tires or low profiles tires. Due to the flimsy side wall on the stock rubber, look for at least 45psi in the from and possibly 35 in the rear.

Good Luck
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Old 01-20-2006, 10:31 AM   #9
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I run 16's for auto-x. With 45psi up front and 38-40 in the rear. Just be prepared to get another set of tire A LOT sooner than usual if you don't have a spare set for auto-x.
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Old 01-20-2006, 10:42 AM   #10
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dont forget, its always best to start with what you have and add parts a little at a time to get a feel for what its actually doing for your car. Also, its better to learn on a car thats more stock so you can develop some solid skills and not just cover up bad habits with good parts.

Have fun out there!
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