🛻 C10, Squarebody & OBS Truck Fitment Guide: What Wheels Really Work

When it comes to getting the perfect stance on your classic Chevy or GMC truck, wheel fitment can make or break the look. At TorqThrusts.com, we specialize in fitments for C10, Squarebody, and OBS trucks, and we’re breaking down what works — and what needs a little extra attention.

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🔧 Common Fitment: C10 & Squarebody Trucks

For most C10 builds, the go-to staggered setup is:

• Front: 20x8 - 20x8.5

• Rear: 20x9.5 - 20x10.5

• NOTE: We also offer plenty of 22" options as well.

This setup fits well on most stock to lowered trucks. The narrower front track width allows room for a 245 width tires, or similar tire without rubbing — especially with 4.5–5 inches of backspacing.

C10 & Squarebody trucks have slightly different tolerances in front.

• C10: 245/40 OR 245/45 front tires on lowered applications

• Squarebody: 245/45 on slight drop but 245/40s on any drop 3/5 or more.

• Roll fender lips for extra clearance

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🔧 Fitment Differences: OBS Trucks (1988–1998)

Here’s where many get tripped up — OBS trucks have a slightly wider front track width than earlier models but less outer fender clearance.

That means if you run a 20x8 front wheel and your truck is lowered 3/5 or more, running anything taller than a 35-series front tire (like 245/40R20) may result in rubbing on the fender lips, especially during turns or with compressed suspension.

🚨 Pro Tip:

If you want to run a taller tire or a more aggressive stance on an OBS:

• Consider mild front fender trimming

• Avoid tires taller than 27.5"–28" in the front if lowered UNLESS you plan on trimming or rolling the fender lips on front fenders.

• Stick with 4.50"–5.25" backspacing on front wheels

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🛞 What We Recommend

We’ve helped hundreds of customers dial in the perfect setup for their truck. Here’s a tried-and-true package:

For C10s and Squarebodies:

• 20x8 front on 245/40R20 or 245/45R20

• 20x10 rear on 275/40R20 or 275/45R20

• Ideal for lowered applications

For OBS trucks:

• 20x8 front with 245/35R20 (if lowered)

• 20x10 rear with 275/35R20

• OR 40 series if you want more sidewall and plan on fender lip mods.

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📞 Need Fitment Help?

Every truck is different — and that’s where we come in. Send us your:

• Truck year

• Drop specs

• Desired tire look or stance

We’ll help you dial in the exact backspacing, wheel width, and tire size you need for a clean, functional setup with no guesswork.