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Old 01-12-2017, 11:50 AM   #1
Stevemoore
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max wheel / tire on a step side

Hey folks, kinda new here and I could probably search tis topic, but wanted to throw it out here anyway. Trying to find out the widest tire and wheel that can be put under a 68-72 step side fender. No tubs or and other mods. I'm wanting to go with 20" wheels. Truck is probably 6 inches lower than stock in rear and 4 inches lower in front. Probably going with 18" in front and I want to fill the wheel openings.
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Old 01-12-2017, 02:22 PM   #2
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Re: max wheel / tire on a step side

A 10'' wide wheel wit fit under there with no problems, just make sure the backspacing is correct for your year model rear end
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Old 01-12-2017, 04:59 PM   #3
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Re: max wheel / tire on a step side

i wouldn't exactly say "no problem" with a 10" wheel.

i have 20x10 torq thrust II's under a bagged stepside using the narrower 67-70 rear end and 5 lug conversion axles. this was only achieved with custom machined spacers. it only has about 1/8" clearance on both fender lip and the bedside. i am also using an adjustable trac bar in order to get the rear centered perfectly.

it will fit, but it's a LOT of work
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Old 01-12-2017, 05:17 PM   #4
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Re: max wheel / tire on a step side

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Originally Posted by Willie Makeit View Post
i wouldn't exactly say "no problem" with a 10" wheel.

i have 20x10 torq thrust II's under a bagged stepside using the narrower 67-70 rear end and 5 lug conversion axles. this was only achieved with custom machined spacers. it only has about 1/8" clearance on both fender lip and the bedside. i am also using an adjustable trac bar in order to get the rear centered perfectly.

it will fit, but it's a LOT of work
I agree with you on a bagged truck there would be a lot more work involved to make them tuck, but he said he was lowered 6".
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Old 01-12-2017, 07:52 PM   #5
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Re: max wheel / tire on a step side

Any tips on the backspacing? Also, will these trucks accept a 10" up front?
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Old 01-12-2017, 09:23 PM   #6
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Re: max wheel / tire on a step side

My 69 short step has about a thumb width clearance on inside and outside with 275 55 17 on 17x9 Legend wheel with 5" backspace. This is with the wider 71-72 5 lug axle. That's as big as will fit if you don't want rubbing and you are 7" down in the back.

On the front I have 17x8 with 4.5" backspace. 235 55 17 an I am REALLY happy with that combo, and my opinion is anything much bigger in the front looks funny.



Once again, opinions.... 17's are the smallest I would run on the front so the tie rod can tuck into the wheel which lets you go wider to the inside in the front. 20's really start to look a little odd I think. If I could get a good wheel for the price, 18's seem to be the sweet spot for tire availability.
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Old 01-13-2017, 07:21 AM   #7
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Re: max wheel / tire on a step side

15x10 5.5 backspace , 28 10.5 slick no issues...
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Old 01-13-2017, 09:14 AM   #8
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Re: max wheel / tire on a step side

I don't have 20's, but this combo is 18.x9.5 (5.25bs) with 285/40/18 tires all around. Lowered 4.5/6.75. I have the wider 72 rearend also.

The combo fits pretty good, but not without issues, well at least for what I do. I started doing more autocrossing with it. Under normal street driving conditions, not of it was an issue at all. I had to modify the lower control arms on the front because the inner wheel lip was rubbing the LCA at full lock under hard cornering.

On the rear, it still tends to rub the inner bedside, again under hard cornering. Normal street driving yielded no issues.





In these next photos, I have 1/4" spacers on the front wheels, and 7/16 spacers on the rear wheels. I did this to hopefully cure the rubbing issues in the rear. I just added the front spacers so the rears didn't look odd being out almost a 1/2" more. It did cure the rubbing at the next autocross I went to.



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Old 01-13-2017, 09:33 AM   #9
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Re: max wheel / tire on a step side

Just to clarify guys I was only talking about a 15x10 on the rear of the truck, I haven't ever tried anything over 8 wide on the front
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Old 01-13-2017, 10:09 AM   #10
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Re: max wheel / tire on a step side

Should fit fine. I have 15x10's all the way around but mines only a 3/4 drop.

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Old 01-13-2017, 11:10 AM   #11
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Re: max wheel / tire on a step side

Here's a stepper I did with 20x8 and 22x9 with a 255/35/20 & 265/40/22. My truck was dropped 5/7. So with a rear tire height of 30" and width of 10.5" it fills the wheel well just about perfect. This was with the wider 70-72 rear axle also.
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Old 01-13-2017, 11:20 AM   #12
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Re: max wheel / tire on a step side

Thanks a bunch for all of the replies! I've got to get measuring and see what I can come up with. You guys have helped a lot.
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Old 01-13-2017, 11:39 AM   #13
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Re: max wheel / tire on a step side

Here is my 68. I'm wanting to try something different and get away from the 15's. Would like to go with American TTs with the CL205 option.
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Old 01-13-2017, 11:50 AM   #14
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Re: max wheel / tire on a step side

Quote:
Originally Posted by Mike C View Post
My 69 short step has about a thumb width clearance on inside and outside with 275 55 17 on 17x9 Legend wheel with 5" backspace. This is with the wider 71-72 5 lug axle. That's as big as will fit if you don't want rubbing and you are 7" down in the back.

On the front I have 17x8 with 4.5" backspace. 235 55 17 an I am REALLY happy with that combo, and my opinion is anything much bigger in the front looks funny.



Once again, opinions.... 17's are the smallest I would run on the front so the tie rod can tuck into the wheel which lets you go wider to the inside in the front. 20's really start to look a little odd I think. If I could get a good wheel for the price, 18's seem to be the sweet spot for tire availability.
So your are 5/7 drop?? did you need to frame notch?
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Old 01-13-2017, 12:16 PM   #15
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Re: max wheel / tire on a step side

Hey 68stepbed I am going to run a very similar setup on my truck. Do you think going 5.5 back spacing would fix the issue?
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Old 01-16-2017, 03:33 PM   #16
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Re: max wheel / tire on a step side

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Hey 68stepbed I am going to run a very similar setup on my truck. Do you think going 5.5 back spacing would fix the issue?
No. The 5.5" bs will put the wheel closer to the inner bedside. A 5"bs would fix it.
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Old 01-16-2017, 04:43 PM   #17
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Re: max wheel / tire on a step side

You might find this helpful. It's from the suspension section faq.

http://67-72chevytrucks.com/vboard/s...d.php?t=530806
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Old 07-09-2018, 11:49 AM   #18
Pitufina
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Quote:
Originally Posted by 68Stepbed View Post
I don't have 20's, but this combo is 18.x9.5 (5.25bs) with 285/40/18 tires all around. Lowered 4.5/6.75. I have the wider 72 rearend also.

The combo fits pretty good, but not without issues, well at least for what I do. I started doing more autocrossing with it. Under normal street driving conditions, not of it was an issue at all. I had to modify the lower control arms on the front because the inner wheel lip was rubbing the LCA at full lock under hard cornering.

On the rear, it still tends to rub the inner bedside, again under hard cornering. Normal street driving yielded no issues.





In these next photos, I have 1/4" spacers on the front wheels, and 7/16 spacers on the rear wheels. I did this to hopefully cure the rubbing issues in the rear. I just added the front spacers so the rears didn't look odd being out almost a 1/2" more. It did cure the rubbing at the next autocross I went to.




What brand wheels do you have on your truck?
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Old 07-11-2018, 07:18 AM   #19
68Stepbed
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Re: max wheel / tire on a step side

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Originally Posted by Pitufina View Post
What brand wheels do you have on your truck?
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US Mags Rambler

http://us-mags.com/rambler-u111-w-6133.htm
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Old 07-12-2018, 12:13 AM   #20
Pitufina
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Thanks for the info.
One more question with that 18x9.5 with 5.25 bs id you were to lower your truck to a point where your tire will go inside the fender would it be touching the inner or outer part of your back fender
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Old 07-12-2018, 07:56 AM   #21
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Re: max wheel / tire on a step side

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Originally Posted by Pitufina View Post
Thanks for the info.
One more question with that 18x9.5 with 5.25 bs id you were to lower your truck to a point where your tire will go inside the fender would it be touching the inner or outer part of your back fender
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It's actually a really tight fit both ways, but it rubbed the inner bedside on heavy turns. I fixed that last year by putting tubs in the bedside.

However, I would imagine that if a truck were bagged and the fender dropped enough, there might be some clearance issues with the fender lip. Mine sit just above the tire and my coilovers have limited travel, so it's never been an issue for me.
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