why 18'' wheels more popular on track?

Volk Z

The only flip side of a 19 vs 18 is a smaller sidewall which means less flex around a corner, which in turn would aid in track times... BUT that being said an 18 on the 370z would still use a 35-40 series profile which is still low.

For drag racing a higher sidewall in the rear may help off the line.

Overall an 18 inch would typically be lighter using the same rim comparison but a Volk CE28 in a 19 inch weighs around 19-20 pounds vs a Rota knock off weight more in an 18 inch. So this comparison must be 18 vs 19 in the same exact wheel and same tire brand combo and width.

Handling can be tweaked with the slightest adjustments like alignment, tire pressure etc.

The only real way to test if you are that specific to getting the lowest track times is testing. We all know they didn't just slap the GTR together and go "I bet she goes fast"... NOpe they continually tested at the Nurbergring track over and over and made tweaks.

-Chad

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Sh0velMan

There's such a thing as too little compliance.

Smaller sidewall does not automatically mean more grip. There's plenty of folks out there that run 18's rather than 19's in order to get a slightly taller sidewall and more compliance without increasing OD.

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Volk Z

Word, but I never said a 19 would yield better grip.. I just said could help with track times as it may help have less flex in the sidewall and possible help with cornering (less understeer type of deal)

If we are talking grip then- tire brand, tread pattern for specific event, tire pressure, alignment, suspension, sway bars etc etc.

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andre12031948

I took my used 2012 base auto(1,200 miles) to Atco Friday night. Owned it for only 3 days but just had to find about traction/car.

My first completed run in a dry lane, 60' was 2.010 seconds & 13.137@106.12 1/4. At 1,500 rpm I let the brake go & at moderate rate stepped on the gas peddle. After that run, it looked like amateurs went into & over the watered ground & got everything right up to the stating line wet.

Even at idle or a bit more than that, my wheels chirped a bit & 60' & 1/4 times suffered. 60' 2.20's & 2.10's. I got the exact numbers in my post that I made Friday.

So if 2.00 60' can be done with stock base wheels/tires & leaving at only 1,200 to 1,500 rpm, why would I next spring have a problem doing 1.8's and better using drag radials??? It's an automatic All you need is a clean prepped dry starting lane.