KC95SC400

iTrader: (3)

Thinking about wheel sizes and backspacing makes my head hurt so I'm hoping some experts will chime in here.

I'm looking at buying some used slicks. There is a guy nearby with a set of MT's, they are 26x10x15. I know (I think I do anyway) that 26 is a good match for the stock tire height and that 10 is about the same width as the 275-40's I have on the car now.

The real question is, will these 26x10 tires fit installed on a 15 inch wheel with a 5 inch backspacing?

Thanks for any help!

KC

RedPhoenix

iTrader: (10)

what is the width of the rim itself? 10" as well or no?

You can EASILY use this math equation.

So....

15x8 +12.7
15x8.5 +6.35
15x9 +0
15x9.5 -6.35
15x10 -12.7

Math SHOULD be correct... cannot promise anything but I think that makes sense. Any pics of the wheel to clarify the aggressive figment?

5sp_jzz30

iTrader: (2)

we need to know the width of the wheel. 15" with 5" BS doesnt tell us anything.

if the tire is 10" wide then the rim is most likely a 9" or so.

KC95SC400

iTrader: (3)

Doh! I did forget to put the wheel width. It is a 10inch wide wheel. My bad. If I understand correctly with the 5 inch backspacing, this would put the wheels out / in 5 inches from the rotor face. Ha! Would be very agressive looking if my thinking is correct. Would likely need to remove the wheel well trim since my car is also lowered a bit.

I might be going a different route though. There is another guy, a heck of a lot closer, with a set of DOT (I think MT's) size 26 x 9.5 x 15. Says they are mounted on a set of "Chevy stock wheels" with a 4.5 x 5 bolt pattern. I am trying to find out from him the offset and width but since most OEM wheels are pretty much consevative, I doubt they wouldn't fit.

Might pick these up on Friday.

KC

5sp_jzz30

iTrader: (2)

a wheel that is a 15x10 with a 5" BS means the face is exactly in the middle of the wheel.

so its the same as a 15x10+0 offset. that is very aggressive especially with a slick that will be stocking out past the wheel.

i have 18x10+22 and i had to do a fender roll, stretch the tire(245/40 in a 10" wide wheel), and have it REALLY slammed...with a lot of camber.

i dont think those wheels will work.

i would suggest going to the guys house and trying them on.

KC95SC400

iTrader: (3)

Thanks for the info guys but it looks like I'll be going with a different set.

Guy local has a set of Hoosier et quick time tires mounted on a set of GM 15x7 wheels that have a 4.5 x 5 bolt pattern. Don't know if these wheels will fit but I would think they have a better chance than the 15 x 10's with a zero offset.

If not, I should be able to find a few different stock Toyota 15's which were removed to put on alloys, since I work at a dealership.

KC

mitsuguy

iTrader: (2)

GM doesn't use 4.5" bolt circle...

GM uses a similar one 5x115, which is close and may actually work, until it puts too much stress on the lugs and they shear off...

KC95SC400

iTrader: (3)

Ya, I was skeptical. Turns out they are 4.75 x 5. I'm on a hunt for wheels, have a few leads.

Anyone have any tips for launching on slicks with an auto trans?

KC

mitsuguy

iTrader: (2)

Yup.... two methods for launching an auto trans period...

With slicks, you will want to do a burnout to get the tires up to operating temperature. Essentially, pull into the water box, a quick spin, and roll through... Apply the foot brake, and give it enough gas to get the tires to spin - apply more gas until the tires spin and spin, slowly letting off and then the tires will bite and make a chirp/squeal. Roll up to the line, and here are where there are two different ways: 1) Leaving car in drive, foot on brake, pull right up so the tree goes stage, stage, countdown (3 yellows), green, you will want to work on the timing and depending if you are using a sportsman or pro tree, decide where in that sequence you simultaneuously let off the brake and mash the gas... This lets the torque converter "flash" and gives you a nice bit of instantaneous torque. the second way, would be to not pull up to the stage timing lights at first, but to inch into the first timing light like normal, but as you light the first stage light, hold the foot brake hard (hard enough so the rears don't want to turn too), give the car some gas to get it up to the stall speed of the torque converter, let off the brake just a hair (this will take some practice), so that you light the second set of stage lights, while keeping rpm up at the same time, watch for the countdown lights and green, and again, with some practice determine the perfect place to go full throttle and let off the brake completely...

mitsuguy

iTrader: (2)

That looks like my typing... Did I originally post that??? I don't care that its used, in fact glad it is, just curious...

RedPhoenix

iTrader: (10)

lol found it on a another forum - maybe its yours?

Gunnar

When it comes to drag wheels, 15x8 needs a 5.5" backspacing and 15x10 needs a 7.5" backspacing, to fit properly into our wheel wells, if that hasn't already been established.

KC95SC400

iTrader: (3)

Hey guys,

Thanks for the info so far.

I'll elaborate more later, at work now. I had got a set of wheels, turns out they are two different wheels, one side fits fine the other side rubs.

Anyway, quick question. How about a 6.5inch wheel with 5.25inch backspacing. I think it should fit but as I said, it gives me a headache thinking about it.

Thanks,

KC

rdm20fan

You have no idea how long I have been looking to find this information.
I found a couple sites that say the 15x10 8" backspace is the correct size.

Will both work, or is one better then the other?
I have lowered the car. will this cause aditional problems?

rdm20fan

Second question.
15x8 vs 15x10
Will the 8 inch rim cause the tire to ballon out more on the sides?