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#1 |
Registered User
Join Date: Nov 2014
Location: Boston
Posts: 139
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Tire Advice for 78 Big 10 with 15 Rally Wheels
The time has come. I need new tires as the current ones, which are probably 30 years old, are worn.
I currently have the stock 235/75 R15s on for all four tires. I am wondering if I should go a smidge taller on the back to jack the back end up a little. I dont want to mod anything or swap rims. Any good options out there? I am going to go with white lettering. |
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#2 |
Senior Member
![]() ![]() Join Date: Mar 2016
Location: Near Canon City ,Colorado
Posts: 3,952
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Re: Tire Advice for 78 Big 10 with 15 Rally Wheels
255-70 rear and 245-60 front on 15x8 rally
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'35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 ![]() ![]() |
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#3 |
Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
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Re: Tire Advice for 78 Big 10 with 15 Rally Wheels
I can't tell from the pics -- is that 2wd or 4wd? If 4wd, don't mismatch the front and rear tires. Even for a 2wd, I don't like the look of mismatched tire sizes.
The rear is easy to lift. Buy a set of longer u-bolts, and install a two-inch block between the axle and the spring. https://www.offroaddesign.com/suspen...ft-blocks.html
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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#4 |
Just here to tinker
![]() Join Date: Jun 2008
Location: Holland, MI
Posts: 3,692
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Re: Tire Advice for 78 Big 10 with 15 Rally Wheels
My burb has 255/70 all the way around on factory 8 wheels. They fill out nicely.
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
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#5 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,539
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Re: Tire Advice for 78 Big 10 with 15 Rally Wheels
Another issue with mismatched sizes is what size do you pick for the spare? If you have a road size tire issue, you could wind up with two different sizes on the rear. Not good, especially if you have some kind of limited slip differential.
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#6 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,963
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Re: Tire Advice for 78 Big 10 with 15 Rally Wheels
Utilize a spare that's the same size as the rear tires.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#7 |
Senior Member
![]() ![]() Join Date: Mar 2016
Location: Near Canon City ,Colorado
Posts: 3,952
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Re: Tire Advice for 78 Big 10 with 15 Rally Wheels
That's all I did . You just have match the height...But then I never had a flat.
__________________
'35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 ![]() ![]() |
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