The tire industry does not use the word larger. A tire can get wider and not taller or taller and not wider. Or you could change them both.



A wider tire will allow for a greater contact patch and help with traction but it will also take a bit more power to get them going. Since they have to spin more tire while it is touching the ground.



A taller tire will effect your gearing(tachomoeter), speedomoter, and Odometer. So it will register slower since the cars is designed for a certain size tire and a certain rolling radius. So a taller tire will make them all run slower than stock since your tires take longer to make a full rotation. A shorter tire is oppposite, everything will run faster than it actually is. It depends on what you are going for. And of course ride height will be altered with shorter or taller tires so your handling will be a little off as well. The best bet is to keep your RR as close to stock as possible.

Ok thanks alot. So when I start making 400 rwhp I should go for a wider tire? For traction purposes correct..?

It will help. A 225 is just not very wide for alot of hp.

umm i do nice healthy burnouts on my drag radials..... i have a few 1.70 60 FT's to show for it too!

Just a side note here: When you are reading the catalog information for a drag tire, they will show the ""OD" or "Outside Diameter." This information is useful when calculating your speed in gears. Relates to what Lane Change calls "rolling radius" (D=2*R) A tire with a greater OD than your stock tire will do the same thing as a taller (numerically lower) rear end. Of course, a smaller OD tire will do the opposite and give you better acceleration with a lower top end. Any change in OD from stock will throw off your speedo.



You'll also notice that slicks are sized like this: 26 x 10.5 x 16, where 26 is the OD in inches, 10.5 the tread width in inches, and 16 the wheel diameter.

Vosko, try a run without a healthy burnout and I bet you run the same time or better. Just avoid the water box and clean your tires off before you line up. If you can smoke them and then race immediately after then it may help a bit, but once street tires or drag radials cool off they tend to lose traction. A real slick will not disapate heat as fast as a street tire.



I agree with 1988RedT2 about the O.D. A rolling radius is the same it measures the total circumfrance of a tire to calculate your rpms, speed, and gearing. Sometimes a standard sizing measurement is not what they claim. I have plenty of friends that run slicks and the 26x10.5x16 are only 8.75 inches wide. Even thought they claim to be 10.5. The same goes for metic sizes. For some reaon, tires from different manufactures with the same tread width are not actually the same width. It is kind of odd.

i have raced on cold tires it makes a large difference. there is a reason pro drag racers do monster burnouts besides the fact that its alot of fun https://www.nopistons.com/forums/pub...#>/biggrin.png

hmmm....i got nt555's not the r's.when i race should i lower my psi, and if so wat 2? woo woo

Air the front up to max press. and lower the back down to around 20psi. You could go a little less, but not much. I usually run my street tires at 20psi rear and 44psi front. Some tires are max press. 35psi. Check your sidewall first to see what you can run.



Scott

hey thanks. itll be tight once i get my whistle muffler.woo woo!!!!