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Wheels, Tires, offset, oh my
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L8ndeb
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Joined: July 20, 2015
Posts: 83
Location: Reno, NV
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PostPosted: Sat Jan 06, 2018 11:51 pm    Post subject: Wheels, Tires, offset, oh my Reply with quote

Hi All,

Admittedly I am just plain ignorant when it comes to offset, back spacing and the like. With that said, I have a Manx wannabe built on a 1961 swing axle chassis. Empi disk brake conversion on both front and back. The rotors have a typical Chevy 5 lug pattern.
My questions are, would I be ok with 15x8 in the back and 15x6 in the front? The rears have a 4" back space while the fronts have s 3.5" back space. All have 0.00 offset. I was thinking of 265/275's on the rear, with maybe 195 or so on the fronts.
Please, any opinions, comments, suggestions are welcome.

TIA
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YDBD
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PostPosted: Sun Jan 07, 2018 12:27 am    Post subject: Re: Wheels, Tires, offset, oh my Reply with quote

Shouldn't be a problem.

on or off-road shouldn't matter either except the tire height of the front and rear. 195s on the front with 3.5 back space may hit the fender edge unless it is raised.

Is it street legal? Do your wheels/tires have to be inside the fender?

Off road can be like this:

Image may have been reduced in size. Click image to view fullscreen.


On road like this:

Image may have been reduced in size. Click image to view fullscreen.

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Sharp64 Premium Member
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PostPosted: Sun Jan 07, 2018 6:47 am    Post subject: Re: Wheels, Tires, offset, oh my Reply with quote

I have 295/60/15ís on the back of my buggy with 15x10ís. Front is 195/60/14ís on 14x6ís. Iím all the way down on an adjustable front and with 400lbs of meat puppet in the cockpit I have zero rub. In fact Iím buying dropped spindles to bring the front end down more. I do have to add that I donít have a fuel tank up front so that may be effecting my height.
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clonebug
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PostPosted: Sun Jan 07, 2018 9:31 am    Post subject: Re: Wheels, Tires, offset, oh my Reply with quote

With Empi disc brakes you will get a minimum of 1/2 inch positive offset each side on width which is something I forgot about when buying my front discs and wheels.

The rears discs set my offset about the same as drums with an adapter.

That said you need to check your clearance which will depend on if you have a 66 and earlier transmission or a 67-68 swing or 69 up IRS.
The 67-68 swingaxle has a longer axle and puts the wheels out a bit more from the swingarm plates.

I run a Weld Draglite on front and back with a lot of backspace. I'm not sure what the rears are but the fronts are 5 inch wide with 3.5 inch backspace.
There is plenty of clearance with 185/60-15 tires and they could go in at least 2 inches more I would think.

With my 8 inch wide Weld wheels and 275/60-15 tires I have about an inch of clearance with my 67 swingaxle.

Image may have been reduced in size. Click image to view fullscreen.


Here you can see the clearance left.

Image may have been reduced in size. Click image to view fullscreen.


Nicely tucked under the body...

Image may have been reduced in size. Click image to view fullscreen.


Fronts

They still stick out an inch or so but I have the max backspace and negatice offset I can get with that size wheel.

Image may have been reduced in size. Click image to view fullscreen.

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vwracerdave wrote:

Take a good long look in the mirror and report back on what you see.


Dauz wrote:
Locked/limited... same diff

Paul.H wrote:
That one line on that chart is probably better info than you can get from this place in a month



My Megasquirt Fuel Injection Turbo Buggy Build
(Now with Water/Alcohol Injection)
Upgraded to MS-2 Extra direct fire wasted spark

http://www.shoptalkforums.com/viewtopic.php?f=3&t=127936


Last edited by clonebug on Tue Jan 09, 2018 7:39 am; edited 1 time in total
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L8ndeb
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Location: Reno, NV
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PostPosted: Sun Jan 07, 2018 11:09 pm    Post subject: Re: Wheels, Tires, offset, oh my Reply with quote

Thanks to all that have replied so far.

Clonebug, especially thanks because you have been there with the Empi brakes. I have one of those A0, NOT AO, transaxles. From what I have read, probably a '68. It does have long axles. Yes, a swing.

Thanks again,

Leyton
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clonebug
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PostPosted: Mon Jan 08, 2018 11:11 pm    Post subject: Re: Wheels, Tires, offset, oh my Reply with quote

L8ndeb wrote:
Thanks to all that have replied so far.

Clonebug, especially thanks because you have been there with the Empi brakes. I have one of those A0, NOT AO, transaxles. From what I have read, probably a '68. It does have long axles. Yes, a swing.

Thanks again,

Leyton


I have a 68 as a spare. They came with a 4 lug drum whereas the 67 had the wide 5 lug drum. The outer axle housing will be the same length but the splined area on the 68 is longer than the 67 due to the difference in the drums.
Make sure you order the correct kit for the 68 because the rotors will be different to make up for the longer axle spline. Otherwise you will have to use a hardened spacer to make it work.
Better to have the correct rotors.
_________________
vwracerdave wrote:

Take a good long look in the mirror and report back on what you see.


Dauz wrote:
Locked/limited... same diff

Paul.H wrote:
That one line on that chart is probably better info than you can get from this place in a month



My Megasquirt Fuel Injection Turbo Buggy Build
(Now with Water/Alcohol Injection)
Upgraded to MS-2 Extra direct fire wasted spark

http://www.shoptalkforums.com/viewtopic.php?f=3&t=127936
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