wheel offset question:

wheel offset question:

Postby markmitchmarkmitch is online! [OP] » March 7th 2017, 11:07pm

Just curious I would like to put wider tires on the back of my Astro. I have stock 98 chrome wheels on it now I do not wish to go to 16 or beyond either so I now have 245/60R15 on the rear and my question is if I by new wheels and go with a different offset can I go wider in the back only without any rubbing or hitting any where. Thanks, Mark
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Re: wheel offset question:

Postby chevymaher » March 7th 2017, 11:27pm

I have 295's all the way around for the last set of tires i have had on it. So yes you can. If "you" do the math and measurements to make it happen.
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Re: wheel offset question:

Postby Lumpy » March 7th 2017, 11:41pm

chevymaher wrote:
..."you" do the math and measurements to make it happen.


That'd be my suggestion. There's not a whole lot of excess room in any of our wheel wells, even with extreme lifts. Outboard leaf to Inboard tire clearance is sometime glossed over and it shouldn't be. I think we tend to focus on the other side, outboard tire to inboard fender, more than the inside. Mine is very close with just 31-1050 tires. No amount of lift will change either the inner or outer clearance, obviously.

Mfg tire websites will tell you the width of the tire for a given wheel width. Do the (personal) math, I say. Do not rely on "Sure, they'll fit" only to find that your newly invested $2000 is 3mm too big.

Cardboard mock-up, of course.


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Re: wheel offset question:

Postby zach914v8 » March 8th 2017, 1:40am

The way I went about it on the Porsche was buy the wheels I wanted fit. Place them under the car and measure what I needed to to to get them to fit tight under the fender. In my case I needed 2" wheel adapters. You could go crazy and mini tub it. Then even do a custom 4 link with coilovers. I was willing to do what ever had to do to put those wheels under my car and I lucked out it was simple. You could always roll the wheel opening a bit if you had to.
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Re: wheel offset question:

Postby markmitchmarkmitch is online! [OP] » March 8th 2017, 7:40pm

My present info: I have these wheels off a 2000 GMC Safari on my van. http://www.autorimshop.com/gmc-safari-2 ... AtyV8P8HAQ
With these tires on them: fronts are 215/70R15 and the rears are 245/60R15
The reason for the sizes was because I originally had them on a new Astro with anti lock brakes and they have to be close in height. But in the future I wish to keep these wheels and possibly have them widened on the rear and put wider tires on the rear. There is a place locally that can widen stock wheels. No clus as to the cost of such a job.
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Re: wheel offset question:

Postby andrew678122 » March 17th 2017, 9:20pm

zach914v8 wrote:The way I went about it on the Porsche was buy the wheels I wanted fit. Place them under the car and measure what I needed to to to get them to fit tight under the fender. In my case I needed 2" wheel adapters. You could go crazy and mini tub it. Then even do a custom 4 link with coilovers. I was willing to do what ever had to do to put those wheels under my car and I lucked out it was simple. You could always roll the wheel opening a bit if you had to.

Hey Zach, you have any pix of the Porsche conversion posted anywhere?
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Re: wheel offset question:

Postby zach914v8 » March 17th 2017, 10:06pm

http://www.cardomain.com/ride/2963587/1974-porsche-914/

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There are some at car domain. I did most of the big parts of the build 18 years ago when I was a stupid kid and didn't even think to take pictures of the process. I was too busy trying to get this thing on the road to show off for my buds and impress some tail along the way. :dance: It's amazing what you can do when you are living with your parents and making decent money. :rockon: The Porsche has been on the back burner for a few years as I have been stock piling parts to but in a boxster 6 speed trans. Once I get going on that I will load more images in the gallery.
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Re: wheel offset question:

Postby Mmusicman » March 18th 2017, 4:07am

This all depends on what you are trying to accomplish. Do you want taller... or wider? 60 series tires are taller and skinnier, and 50 series tires are shorter and wider. I'm running 295/50-15 rear, and 235/60-15 front. Wider tires typically require a wider rim.. and most tire manufacturers will tell you what size rim is a best match for whatever size tire you choose.

The 295/50-15 is a very popular size, and typically requires a 10" wide rim. The backspacing is a big factor in where this wheel will sit, or essentially how far it will stick out. I'm guessing from distant memory, but I believe my backspacing is almost 5". My Autodrag Centerlines did offer a few offset choices, but are no longer available in our bolt pattern. If memory serves me correctly, I believe my front tires are on 15x8 rims, with about a 4" backspacing. I have a 1/2 spacer behind them as well.

I used to run a 275/50-15... but they stopped production of this size, so I went to the more popular 295/50-15. I also switched brands (after decades) when I found what I like at better prices.

My wide 50 tires do interfere with my sliding door, which I modified to clear. More backspacing would bring the tire in a little more and clear the door easier with tires this wide. But it really depends on what backspacing models are available in the wheel brand you choose. They all offer different availabilities.

Also bear in mind that this setup is not rotateable, with different sized tires front and rear. This setup is not ideal for every van... and I'm not sure how well it would be suited to a Gen II van.

The "fat tire look" does come with some compromises... which I was more than willing to accept!
I think it works well on a Gen 1

Here's a few photos that hopefully will help...

New 295/15-15 on 15x10 Centerlines with 4 7/8" backspacing:
IMG_2415.jpg

The old BFG 275/50-15 left - - new Hankook 295/50-15 right
IMG_2426a.jpg

Note the bold aggressive tread pattern of the new tire (right) which I also prefer..
IMG_2425a.jpg

I'm happy with the results. :mrgreen:
IMG_2446.600.jpg

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Re: wheel offset question:

Postby 1lowcab » March 18th 2017, 4:36am

That 914 is sick!!!!!!! Love it :thumbup:

Ok, back to the tires......
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Re: wheel offset question:

Postby MI_Ghost » March 18th 2017, 12:49pm

Mmusicman wrote:New 295/15-15 on 15x10 Centerlines with 4 7/8" backspacing:

Mm could you get a measurement from the inside sidewall to the leaf spring please?
My guess is that you are barely clearing the leaf spring by a 1/4".

I am looking at the Wheel Vintiques 37 Silver Pickup Rallye 15x10, 5x5, 5" back spacing, -12mm offset.
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Re: wheel offset question:

Postby zach914v8 » March 18th 2017, 6:20pm

1lowcab wrote:That 914 is sick!!!!!!! Love it :thumbup:

Ok, back to the tires......


Hey, thanks man :D
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Re: wheel offset question:

Postby andrew678122 » March 18th 2017, 6:47pm

zach914v8 wrote:
1lowcab wrote:That 914 is sick!!!!!!! Love it :thumbup:

Ok, back to the tires......


Hey, thanks man :D

x2
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Re: wheel offset question:

Postby Mmusicman » March 18th 2017, 8:20pm

MI_Ghost wrote:
Mmusicman wrote:New 295/15-15 on 15x10 Centerlines with 4 7/8" backspacing:

Mm could you get a measurement from the inside sidewall to the leaf spring please?
My guess is that you are barely clearing the leaf spring by a 1/4".

Actually, it's 3/4"... but you're calculation was pretty close.
Funny.. until now I never realized how close it actually is!
20170318_105929a.jpg

20170318_110253a.jpg
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Re: wheel offset question:

Postby MI_Ghost » March 18th 2017, 10:01pm

Mn, Thanks for the measurement and the pics.
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Re: wheel offset question:

Postby markmitchmarkmitch is online! [OP] » March 19th 2017, 5:52pm

yeah lots of great info thanks guys. I think I will stick with what I have at least for now but I saved this info to my notes for future reference.
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Re: wheel offset question:

Postby andrew678122 » March 19th 2017, 6:43pm

Mmusicman wrote:
MI_Ghost wrote:
Mmusicman wrote:New 295/15-15 on 15x10 Centerlines with 4 7/8" backspacing:

Mm could you get a measurement from the inside sidewall to the leaf spring please?
My guess is that you are barely clearing the leaf spring by a 1/4".

Actually, it's 3/4"... but you're calculation was pretty close.
Funny.. until now I never realized how close it actually is!
20170318_105929a.jpg

20170318_110253a.jpg

Thanks, that is the kind of info we need!
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Re: wheel offset question:

Postby Lumpy » March 19th 2017, 6:48pm

markmitch wrote:
... I saved this info to my notes for future reference.



In the future we won't have wheel offset. We'll have frictionless, silicone donuts that expand, contract, move inboard and outboard, all controlled by onboard smart modules. Several in each wheel. They'll all talk to each other through a serial buss. Google will simply tell your car to drive itself to the Amazon drop off lockers and retreive your groceries. Then Google will automatically post pics and video and googlemaps displays of the trip to this board. Those who enable the feature can click on "Automatically post a random ""Cool"" or ""Looks Great""..."

We won't have to do a thing. We can monitor it all from our video interactive contact lenses.

Made in Sum Poo Provence. There's a kit.


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Re: wheel offset question:

Postby MI_Ghost » March 30th 2017, 10:05am

Mmusicman wrote:My wide 50 tires do interfere with my sliding door, which I modified to clear.

Mm, Could You expand on this a little more. What did you have to modify to clear the tires with the slider?

Wheel Vintiques can be custom ordered for backspacing so my thinking is to increase the backspace to 5.5" to account for the 10mm extra outer tire width. Which should clear the leaf by 1/4" on the glass leaf, 1/2" on steel leaf.
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Re: wheel offset question:

Postby Mmusicman » March 30th 2017, 1:52pm

MI_Ghost wrote:
Mmusicman wrote:My wide 50 tires do interfere with my sliding door, which I modified to clear.

Mm, Could You expand on this a little more. What did you have to modify to clear the tires with the slider?

I cut a slice down the center of the underside bottom of the sliding door... then pulled and overlapped the inner half with the outer half.. essentially making the bottom of the door thinner and further out. You have to go up the curve slightly too. I only went about 1/2 way down the bottom of the door... only the part that made contact with the tire. The door now completely clears the tire. The drawback is that is doesn't seal against the factory seal (in that one section) ... but it hasn't been an issue for me. I would never do this arrangement on a Gen II... only a Gen I shorty with fat 50's series tires.
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