rear end measurement

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Dec 16, 2005

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Jul 10, 2007

#1

• Jul 10, 2007

• #1

i'm having a hard time deciding what measurements to give for a custom rear end for my tubbed '65
i want to be able to have a set of drag wheels, maybe 13" width or so, but also be able to bolt on some street tires, maybe with a 10" width and have them both be in the correct position and look good.
is there any way to bridge this big of a gap with offset or spacers, or anything else?
bear in mind, i do not have the rear end or the wheels yet so everything is customizable
thanks,
Matt

 

1320stang

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Nov 13, 1998

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Jul 10, 2007

#2

• Jul 10, 2007

• #2

No problem, get a center offset or maybe a bit positive with the drag wheels and get full reverse with the street rims. Keep in mind, the deeper the offset, the better it looks and the easier to change. My buddy has a '55 Crown Vic with 15" wheels and he has to disconnect the coil overs to drop the rear down enough to take the wheels off.

If you can, it would be best to get the street wheels and tires first, then set them under the car where they look good and don't rub throughout the full range of travel, then take the flange to flange measurement off that, then you can order the drag wheels with the extra offset to the inside.

 

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Jul 11, 2007

#3

• Jul 11, 2007

• #3

thanks, well, but i need to give the measurements for my rear end this week and i don't know what to give them.... thanks
matt

 

brianj5600

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Sep 19, 2003

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Jul 11, 2007

#4

• Jul 11, 2007

• #4

http://www.amazon.com/Door-Slammers-Chassis-Dave-Morgan/dp/0963121707 This might save a lot of time and money. You might look on some of the suppliers like Alston or CE. They tend to have tech areas.

 

1320stang

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Nov 13, 1998

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Jul 11, 2007

#5

• Jul 11, 2007

• #5

You can't postpone the rear end build? You can do it right once or you can do it wrong at least once and maybe more times.

The only other thing I can tell you is to make a template. A 13" wheel will be 13" wide from where the bead sits, so the wheel itself is really 14" wide, i.e. a 10" wide rim is 11". Figure out what tire you're going to use and see what the sidewall width is when mounted on your rim. Don't forget to take into consideration that a slick will grow in diameter as you go down the track if you're running slicks. Make two templates and lay them under your car where the footprint will be and measure the distance where the flanges will be. You should be able to get what backspace the manufacturer will make.

The other thing you could try is to work backwards from the stock rear end width for your car, if it's a '65-'66 it'll be 52 1/4", then it's just math.

I just hope your not in over your head, don't put the cart before the horse.

 

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Jul 13, 2007

#6

• Jul 13, 2007

• #6

do i atleast have the theory right on this picture, with these offsets and backspacing, would this 14 in rim and this 10 in rim stick out exactly the same from the wheel hub?
i am not a wheel expert, but if someone could evaluate this and let me know if this is hypothetically possible i will have somewhere to go from
thanks, matt

 

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Jul 13, 2007

#7

• Jul 13, 2007

• #7

sorry if u cant see that pic i'll have to post another one later

 

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Jul 14, 2007

#8

• Jul 14, 2007

• #8

View attachment 377236
just want to know if the theory behind this is correct for having drag wheels and street wheels that both line up the same
here it is, thanks in advance,
matt

 

brianj5600

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Jul 14, 2007

#9

• Jul 14, 2007

• #9

I curious why 2 different sizes. I would rather have smaller ones on the track. More tire than you need will only slow you down. Your street tires are the ones that are going to spin. What size tires are you planning on?

 

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Jul 14, 2007

#10

• Jul 14, 2007

• #10

brianj5600 said:

I curious why 2 different sizes. I would rather have smaller ones on the track. More tire than you need will only slow you down. Your street tires are the ones that are going to spin. What size tires are you planning on?

Click to expand...

the track tires will prob. be 30x16.5-15 slicks, and the street tires, maybe 305/30-18 or something like that.
matt

 

1320stang

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Jul 15, 2007

#11

• Jul 15, 2007

• #11

The backspace would be 8.5" on the lower one, but you have the idea.

 

brianj5600

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Jul 15, 2007

#12

• Jul 15, 2007

• #12

The tires are about 5" different in hieght. Gearing will be tough. When you put the slicks on the effective gear ratio will take a blow. That tire is overkill IMO. There are guys going 7.0's @ over 200 mph on 28x10.5 slicks. There are also guys going 5.60's in the 1/8 on a 26x8.5, which is around an 8.70 in the 1/4. Are you looking for Pro-touring on the street and Pro- street on the track? If you cut the quarters for 30" tall tires, it will look awkward with 25" tall street tires.