Author Topic: tire size questions  (Read 982 times)

Offline JohnnyPopper

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tire size questions
« on: January 04, 2024, 08:59:16 PM »
While on the subject, my 33" KOA's have a few miles to go before replacing.

Oh, btw, '78 K10 bone stock.

I believe I have 15 x 11" wheels, and thought I might try 35" on the next go round.

Any thoughts on if the 35" being wider and the wheel being the same might bow out the sidewalls?

I did a clearance test and I don't think anything will rub.

Thanks in advance for any guidance!!!
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Captkaos

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Re: tire size questions
« Reply #1 on: January 05, 2024, 07:52:18 AM »
35" wont fit on a bone stock K10 without tearing into the rear fender.  I would imagine these have some offset on them and if that is the case 35's will most likely hit the bottom of the front fenders
what is the width of the 33's on there now? You can technically get the same width on the 35's, but that extra 1" of circumference is the issue.

Offline JohnnyPopper

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Re: tire size questions
« Reply #2 on: January 05, 2024, 08:08:45 PM »
With her current stance I can't see how that would happen. But I just don't know.

Oh, so not the top of the fender, but the skirt nearest the wheels?
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Captkaos

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Re: tire size questions
« Reply #3 on: January 06, 2024, 02:55:23 PM »
Yes, It typically hits at the rear of the fender opening.

Offline Mike81K10

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Re: tire size questions
« Reply #4 on: January 06, 2024, 03:34:48 PM »
I RAN 33.50"s on my K10 in the past and they fit well.
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Offline JohnnyPopper

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Re: tire size questions
« Reply #5 on: January 09, 2024, 06:32:56 PM »
Yes, It typically hits at the rear of the fender opening.

So I guess it happens while suspension is compressed, correct?

What if you're only on street?
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Captkaos

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Re: tire size questions
« Reply #6 on: January 10, 2024, 08:49:36 AM »
yes but it wont take much compression, driving out of a sloped driveway could do it.
If it ever bites that part it will pretty much ruin a fender,  If you feel like it is a risk you can take, that would be up to you.

Offline VileZambonie

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Re: tire size questions
« Reply #7 on: January 16, 2024, 03:26:11 PM »
Unless you plan on lifting it two more inches, stick with the 33"S
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline ehjorten

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Re: tire size questions
« Reply #8 on: March 01, 2024, 11:16:17 AM »
33" tires on my '77 K20 with stock suspension. No way 35" would fit without a lift.
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6