second_2_none

iTrader: (6)

What is the advantage of a 28" tire over a 26", other than it looks better? I am ordering a new rear end as soon as I figure out what size tire and gear to run. Does it depend on the power your car is making? I will be spraying a 200 shot out of the hole and am trying to make sure it sticks.

buddha845

iTrader: (3)

more/stiffer sidewall? id imagine but someone who knows the deal is bound to chime in lol

lavoy

iTrader: (2)

a taller tire will actually hook better then a wider tire, its a old wives tale that fatter tires hook better but in truth its taller tires that do, of course i am talking about straight line traction here. if you want to look at it like this, imaging the tire as a balloon and you are looking up at the tire threw a glass table if you have a long balloon and a fat wide ballon both with the same air pressure and weight pushing them on the table you will find that they both cover the exact same surface area however the long balloons foot print will be better shaped for straight line traction. a good article on this can be read here. http://autospeed.com/A_108915/cms/article.html

1qwkz

iTrader: (5)

if your gonna go with the 28 make sure you atleast hace 373 gears if not 26 will work prime with 342's

chavez885

iTrader: (12)

28" tire = more MPH

1qwkz

iTrader: (5)

if you have to right gears YES, if not 28=SLOWER TRAPS

therobman

iTrader: (39)

put it this way i had a 28" tire and 3.73's in my m6 and because the tires taller it made them just about 3.42's

DopdBrd

iTrader: (25)

Tire selection should not be limited to looks only. You really have to think about your goals and what will work with your setup. Gear and tire selection should be done at the same time.

If you are running the times in your sig still and want to add a 200 shot to that I would go with 28" tall tire and something like a 4.10 gear if you are a M6

chavez885

iTrader: (12)

Obviously

If he's ordering a rear he should plan his gears/tire combo out.

223HAWK

iTrader: (11)

Im in the same boat..26 or a 28in

Iv got 4:10s geting a new rear soon..Thought about 4:30s..and have been told even think about 4:56!!

I dont race a lot but when I do..I want to be happy with it ya know..

second_2_none

iTrader: (6)

well I have an auto car, I was thinking of 3:89 gears w/ a 28" tire, but I dont know if that is to short of a gear on the street. Or possible a 3:70 w/ a 26". Its not my dailey driver but does see the street quit a bit. This is all good info guys!

1qwkz

iTrader: (5)

def should have it all planned out i agree

cdubbzz

iTrader: (11)

I agree w/ some of the prior statements esp regarding taller vs. wider tire. The more sidewall the better the tire will absorb the shock during a launch. But be sure not to overdo it b/c the bigger tire (28") can potentially slow you down. I'll go out on a limb and say 26's can work but when you start making more hp/tq they become real bitch to hook.

Those of you who are undecided should use the f-body gear calculator. This will help
you determine the best combo of gears AND tires.

--> http://www.f-body.org/gears/

I've had 3.42's & 3.73's with 26" tires and 3.90's & 4.10's with 26", 27" and 28" tires.
My personal favorite (for my combo) is 4.10's and 27's but that limits my trap speed on motor.
I'll prob go to 28's when the juice goes on (for the added mph).

223HAWK

iTrader: (11)

Iv used that but I dont get what Im really doing..I assumeee that the numbers under each gear are the top speed for that gear at each rpm? idk im a retard when it comes to that stuff

chavez885

iTrader: (12)

lol yes, select your tranny,tire size (either by inches or 274/40/17 format), rear gear ratio, and max RPM/shift point.

Should give you a good idea what MPH for each RPM.

nj02vette

iTrader: (2)

Here's the real deal for those interested.

Assuming all else equal, a larger diameter tire has the effect of reducing the tire/pavement interface force. In effect, reducing your numerical rear end gear ratio. This is exactly why everyone above recommends minimum 3.73 gears, since trying this combo with 2.73's would be equvalent to standard tires with 2.53's .

Why in the world would anyone want to do this? Simple, because traction is defined as the friction force between the pavement and tire. If you exceed this force, you get tire spin. Reducing that force means you have a better chance of not exceeding that interface force.

Once at speed, the larger diameter tire means more mph for given rpm, albeit at the reduction of effective real wheel torque.

Than there's real world effects like sidewall flex that allow more contact patch. And why static problems only use two factors such as weight and co-efficient of friction, the traction problem is dynamic, with several other non-linear factors that need to be considered in the problem.

Lavoy posted a good link, but posted a bad analysis of the article for even at the end of that article they espoused the benefits of a wider tire over narrow.

Camaro396

iTrader: (14)

When my car was stock I took it to the track on a buddys slicks for ***** and giggles, and it went 13.30s @ 108 with a 28" tire and 2.73s lol.

For spray I'm going to use 4.10s with a 28" in my auto. On motor I'm going to use 4.56s

223HAWK

iTrader: (11)

I think Id like to go with a 28in tire..and 4:56s is that a bad combo for a 6 speed car and shifting at 67-6800rpms? Or shoudl I go to 4:30s?

DopdBrd

iTrader: (25)

With 4.56's you will be topping out at 124 MPH whereas with 4.30's it will be 132 MPH at the top of 4th. What does your car trap now?

223HAWK

iTrader: (11)

Its right around 117-118 now with 4:10s and a 275/40/17