BMX Dad

My car is lowered about 1.5 inches.

What wheels will I need?

Injuneer

What brand is that.... possibly a Hoosier Quick Time Pro DOT? It doesn't look like a drag radial. QTP has a bare tread with two grooves in it, to meet the definition of "tread" and qualify them as DOT tires, but they aren't good for the street. I ran 26x10.5-16 QTP's and they tend to wander on the street. And they will be deadly with the least bit of water. If it's not a QTP, what is it?

A 27" tire will fit, requiring an 15 x 8.0" 5.5" backspace wheel, or a 15 x 10.0" 7.5" backspace wheel. You may have to do a bit of hammering of the inner fenders with the car lowered.

That's a lot of tire (27.1" OD) for a normally aspirated application. Personally, with what I see in your signature, a 26" tire would be a better choice. The larger the diameter the more it weighs, and that, plus the mass of the tire moving outward from the axle centerline eats up more HP bringing it up to speed. Strike 1.

The added diameter will also make it feel like you have swapped in a lower numerical rear axle ratio. If you still have the stock 3.42 gears, the 27.1" diameter will make them feel like 3.28 gears (if there was such a ratio) compared to a 26" tire. Strike 2.

Just a thought.

You might want to read this:

https://www.camaroz28.com/forums/whe...wheels-576054/

BMX Dad

Fred,

Thank you. They are Hoosier quick time pro.

I will look for the 26" tires. I did read some of your earlier posts. The 27" came up on CL in my area and I thought I would ask.

Thanks again.

BMX Dad

Will Goodyear Eagle radial slicks- 25x10-18 work?

What are the pluses or minuses for a 25" tire?

Thanks

Injuneer

I googled that tire, and it's a road race tire, not a drag tire. Two different designs. I can't find a Goodyear Eagle SS Drag Radial with a 25" diameter or an 18" wheel.

Are these the ones from Craigs List?

New Goodyear Eagle radial slicks- 25x10-18

Drag tires rely on a lot of flex in the sidewall. The wheel rotates in the tire, relative to the tread, to absorb the hit on launch. The flex also increases the contact patch. A 25" tire (1" smaller than stock) on an 18" diameter wheel is going to have a very narrow sidewall, and probably isn't going to work all that well. It works on a road race car because you only want the wheel to flex axially within the tire, so that the tread can stay planted on the pavement. But even that isn't real good for a solid rear axle car, it is better suited to a fully independent rear suspension, like a Corvette.

BMX Dad

Fred,

Thank you.