quote:

Originally posted by TOP38:

quote:

Originally posted by BD104X:
I think all of you guys are fat & slow... my "little" conventional head 584" has been 7.14 in real good air and typically runs 7.20's with my 200lb a$$ in the seat. Albrecht Power & Ron's injection to the front (actually I just felt like bragging and figured maybe I could get Ed to scale my car while him & Al are "swordfighting" at Numidia).

quote:

Originally posted by Mike Rietow:
I'd definitely do a 4.11, or 1.69 low with a 4.29 final gear, especially if it's a short deck 615 BBC.

New Big Bubba radial 2.0 don't grow. From what I hear everyone will have em, once they're released onto the market.

quote:

Originally posted by Mike Rietow:
I'd imagine the current Big Bubba is a 10% growth tire, Hoosier probably 20% or close, now these are educated guesses but subject to error.

You're gonna cross 300-400 rpm higher 1/8 mile on a no growth radial, with more converter slip. You'll see.

If you don't switch to the new Big Bubba Grande radial 2.0, obviously what I'd do hypothetically does not apply to you.

quote:

Originally posted by TOP38:

quote:

Originally posted by Mike Rietow:
I'd imagine the current Big Bubba is a 10% growth tire, Hoosier probably 20% or close, now these are educated guesses but subject to error.

You're gonna cross 300-400 rpm higher 1/8 mile on a no growth radial, with more converter slip. You'll see.

If you don't switch to the new Big Bubba Grande radial 2.0, obviously what I'd do hypothetically does not apply to you.

Every now and then I take a peak at Retread's posts, especially the ones that do not apply to his cone crushing Nova!
So some facts regarding his BS above:

Big Bubba's grow about 6 to 7% on my car going 196+ MPH, not 10%. Less speed, less growth. He's only off by 40+ percent, time for a real education!

Reducing the tire diameter at speed by using a smaller tire or a radial that won't grow much is effectively reducing load on the converter, no different than going from a 4.11 to a 4.29 rear gear. Converter slippage is a function of the load applied to it therefore slippage will be reduced, not increased.

Retread must have stock in the Radial MT's that are in testing now, he almost plugs these tires as much as his triple crome plated bumper, wicked fast cone crushing SBC Nova!

Since you have stock in these tires, maybe you can send me a set to test and we can see who's right!

quote:

Originally posted by 329L:
TECHNICALLY a normal bubba would be 11% growth. It starts life at 35" and grows to 39". You can fact check me on the mickey website...

quote:

Originally posted by TOP38:

quote:

Originally posted by 329L:
TECHNICALLY a normal bubba would be 11% growth. It starts life at 35" and grows to 39". You can fact check me on the mickey website...

So you read it on the internet so it's gospel.

Based on Racepak data and my time slips my Big's grow from 34.9" to 36.6".

Tire growth which is known as the loaded radius or diameter is a function of the tire, rpm and weight of the car. What you read on the internet sounds much closer to the 3186 tire and not the 3195/3197 tires, AKA Big Bubbas, technically!

quote:

Originally posted by 329L:

quote:

Originally posted by TOP38:

quote:

Originally posted by 329L:
TECHNICALLY a normal bubba would be 11% growth. It starts life at 35" and grows to 39". You can fact check me on the mickey website...

So you read it on the internet so it's gospel.

Based on Racepak data and my time slips my Big's grow from 34.9" to 36.6".

Tire growth which is known as the loaded radius or diameter is a function of the tire, rpm and weight of the car. What you read on the internet sounds much closer to the 3186 tire and not the 3195/3197 tires, AKA Big Bubbas, technically!

When the 3195 first came out, MT dealers and the website showed that the tire grew to the same height as the 3186, which is 39". But, the 3195 started taller, so it had less growth than the 3186. This all used to be on the MT website, and you no longer can find it.

quote:

Originally posted by TOP38:

quote:

Originally posted by 329L:

quote:

Originally posted by TOP38:

quote:

Originally posted by 329L:
TECHNICALLY a normal bubba would be 11% growth. It starts life at 35" and grows to 39". You can fact check me on the mickey website...

So you read it on the internet so it's gospel.

Based on Racepak data and my time slips my Big's grow from 34.9" to 36.6".

Tire growth which is known as the loaded radius or diameter is a function of the tire, rpm and weight of the car. What you read on the internet sounds much closer to the 3186 tire and not the 3195/3197 tires, AKA Big Bubbas, technically!

When the 3195 first came out, MT dealers and the website showed that the tire grew to the same height as the 3186, which is 39". But, the 3195 started taller, so it had less growth than the 3186. This all used to be on the MT website, and you no longer can find it.

The 3186 and the bubba's are very close to the same diameter! I have had both and yes, as with all tires, some are smaller and some are bigger depending on the batch. The 3186 grows more because it's a 17" wide tire vs 15" for the bubbas. Also I know the 3186's did not grow to 39" either, more like 37.5 to 38 max on my car/dragster at 195 mph. Maybe 39" on a 210 MPH plus dragster but those cars have rear wings!

When you look at Ed's picture, the rear tires look bigger than they really are with respect to the load radius. Look closer and you can see the 12 o'clock position of the tire to the center of the rim is more than to the 6 o'clock position. This distance is what counts with respect to rpm and mph, basically the effective tire diameter.