miata2fast

iTrader: (2)

i think it’s time I invest in a good pair of reading glasses. Ha! My car came with a 14” spare,

The skinny race tire offerings are super light. The spare wheel would have to be awful heavy to make a skinny tire and spare combo heavier than a factory 14” wheel and tire.

Who can can weigh a 15” spare and report back?

shuiend

iTrader: (24)

Let me see if the spare is still in the tire well of my nb2. I might be able to weigh it if so.

Dusterbd13

Both of my spares, both from nb1s, are stamped 14 on the tire.

at this point, im not sure if they are na or nb spares....

DNMakinson

iTrader: (3)

That's interesting. My comments were based on my perception that NB1 compact spares were 15's, same as Andrew.

However, I just looked at mine and the indication is that it is 14 x 4.

this NB2 is 15x4

Savington

iTrader: (31)

My NB2 spare is a 15. Could be dependent on whether the car had sport brakes or not, so all 03+ spares should be 15x4s, but some 01-02s might not be

DNMakinson

iTrader: (3)

That's what I'm thinking. Sport brakes.

DNMakinson

iTrader: (3)

Front Skinnies: If I end up ponying up the $$ for biased ply skinnies:

How much would it matter between the M&H 3.6/24-15 vs 3.5/22-15?

Pros and cons, assuming no special suspension tuning.

ctdrftna

iTrader: (1)

Go with the 22’s, lighter and fit better

miata2fast

iTrader: (2)

This!

It’s plenty safe, looks right, and faster.

DNMakinson

iTrader: (3)

That’s what I thought. ebay has a set of used Bogarts with the 24’s.

LownSlow616

Im thinking these 24.5" tall on a 15x8 6ul for my rears.

I think it will be a close fit. Don't wrinkle walls "grow" by the end of the quarter mile? It says tire diameter range: 24-24.99 inches

sixshooter

iTrader: (12)

That's a little tall, to my understanding.

LownSlow616

Well crap. If I went with a 23" tall then I think I'd want 13's to get some more sidewall

miata2fast

iTrader: (2)

You can try them, but unless you are making serious power, you will go faster with less tire. A 24.5” will fit though.

Mickey Thompson’s don’t grow much. Some tires are built to grow as you get down the track. These days, most drag racers try to keep tire growth to a minimum.

sixshooter

iTrader: (12)

You say you are expecting 325/325tq on a boosted v6. You might pull off the larger tire with the right diff ratio, depending upon launch technique and torque at launch versus when the boost comes on. Sounds like unchartered territory and trial runs to figure it out.

LownSlow616

Estimated power level is around 400whp. Not much torque tho as full boost doesnt hit til 4500rpm.

Im thinking 5 speed + 4.3 with at 24.5" tire puts me at 122mph on the limiter in 4th which should be good for an 11 sec pass.
Compared to a 23" tire 4th gear is only good for 115mph and I'd have to shift to 5th

Edit: assuming the drivetrain stays together after launch*

sixshooter

iTrader: (12)

You have a short gear and good power so you will need the tall tire

DNMakinson

iTrader: (3)

So, I may have jumped ahead of myself. Orders some wheels and tires. Racing slicks. Now I look at Atlanta Dragway (nearest to me) and I'm not sure there is a class that I can race in. They have also reduced their Test and Tune days.

The best class would have been TrueStreet, but for that, must be DOT tires. I haven't found any cheater slicks small enough.

Need a track that is friendly to "imports", I guess.

miata2fast

iTrader: (2)

Most tracks do test and tune one or two days a week.

If you are just starting to try drag racing, you will be better off with biased ply slicks. DOT tires are a bit less forgiving and require more time to get the setup all working properly. I really think you will be happy with the tires you originally picked out. Don’t over think it.

DNMakinson

iTrader: (3)

I also note, as I continue to overthink, that M&H has Street and Strip Tires in 13” that are DOT wrinkle wall. Not quite as soft a compound, but likely fine at my power level.

Would allow me to test and tune, and also run TrueStreet in same set-up.