Drag Radial Question

[FreakyFastFreddie]

Considering the same drag radial....20" vs. 18".....how much difference is there in ET? I understand why the 18" size would be better, but would there really be that big of difference on my car?

Anyone have experience running both on their car and care to comment?

[SYCK SS]

Considering the same drag radial....20" vs. 18".....how much difference is there in ET? I understand why the 18" size would be better, but would there really be that big of difference on my car?

Anyone have experience running both on their car and care to comment?

Get the 18's and change em at the track. They will last longer, weigh much less ( big benefit that 20s don't offer), and the thicker sidewall helps absorb the shock to your drive train.

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[FreakyFastFreddie]

Get the 18's and change em at the track. They will last longer, weigh much less ( big benefit that 20s don't offer), and the thicker sidewall helps absorb the shock to your drive train.

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I hear ya, J...but proof is in the pudding so they say. Wondering if anyone has solid numbers to prove it's worth going that route.

[SYCK SS]

I hear ya, J...but proof is in the pudding so they say. Wondering if anyone has solid numbers to prove it's worth going that route.

I personally have not run it. But I know several that have. The 18's reduce rotating mass significantly.

Putting 20" radials on will net better traction but won't reduce weight.

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[TonyNo]

A bigger sidewall is key, as syck ss mentioned. Not only for shock, but, traction as well.

There has to be someone here that has slips for stock 20's, and, 18" DR's...

[FreakyFastFreddie]

I totally agree with you guys. Curious what that equates to in numbers. You're right Tony, I'm sure someone has Stock 20's vs DR 18's, but how about DR 20's vs. DR 18's?

[SCOTCH MAN]

I totally agree with you guys. Curious what that equates to in numbers. You're right Tony, I'm sure someone has Stock 20's vs DR 18's, but how about DR 20's vs. DR 18's?

I've ran both 20 Nitto 555 and 18 Nitto NT05. Cannot say what the time difference is because I began running the 18s with the cam. Did not run the 20s with the cam so no comparison can be done. I do agree that traction and shock are the pluses for the 18s. I would not run 20s. I also ran stock P Zero 20's and would definately not recommend them for your car at the strip.

As a side note the 20" (275/40) P Zeros and the 18" (305/45) Nitto NT05s have the same circumference so the trans and speed-o-meter cannot tell the difference.

[TonyNo]

Ah ha. I don't think anyone has done that on purpose. Would be interesting to see, though.

Drag 20's also seems like an oxymoron. :P

[TonyNo]

As a side note the 20" (275/40) P Zeros and the 18" (305/45) Nitto NT05s have the same circumference so the trans and speed-o-meter cannot tell the difference.

Interesting. No "gear" advantage, then.

[FreakyFastFreddie]

Thanks again guys. Maybe my memory is failing me but seems like I see a lot of DR's on stock rims. No?

[SCOTCH MAN]

I had the 20s on Torque Thrusts.


Jim
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[TonyNo]

I usually see DR's on non-stock 18s. Also, only certain ones can clear the Brembos.

[SCOTCH MAN]

And with my 305/45/18 I picked a wheel that clears the Brembos and the wheel well liners.


Jim
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[Pro Stock John]

Are you cam / blower now?

If you are wanting to run 20" drag radials, I would get Mickey Thompsons. I don't recall if Hoosier and M&H make 20" drag radials in the right size. I know of a few folks cutting 1.5's on them, like Bill Kurrus who posts on Camaro5. He has that ZL1 in St. Louis that runs low 10's on 20's.

[SYCK SS]

I guess we should ask you what your ultimate goal is?

If you're looking for a convenient way to gain more traction but still be able to daily drive the way it sits. Then sure, throw on a set of 20" radials.

But if you are looking to maximize the performance then 18" is where it's at. Proof is in pudding as you have said. And it's been proven that reducing weight will also improve ET. So right off the bat you will see improvement because of weight savings PLUS the added traction. It's been proven. So simple equation being.

18" DRs > 20" DRs > street tires.

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