Do Wider Tires Actually Have More Grip? Testing 27 Cars

Wider tires mean more grip — or so every car enthusiast has been told. Engineering Explained’s Jason Fenske put that assumption to the test at NWAPA’s 2017 Mudfest, running sixty-to-zero braking tests across twenty-seven different AWD and 4×4 trucks and SUVs with a Vbox data logger. The results complicate the simple version of the story muscle car owners repeat about tire width, weight, and stopping distance. Commenters, including more than one physics teacher’s former student, dig into exactly why. Watch to see what the data actually says.

Every car enthusiast has heard the claim: wider tires mean more grip. It gets repeated so often, by so many people, that it’s treated as settled physics rather than a genuine engineering question worth actually testing. Jason Fenske, host of Engineering Explained, decided to stop taking that claim on faith and instead put it through real, controlled braking tests across a genuinely enormous sample size. What he found complicates the simple version of the story that most car enthusiasts, muscle car owners included, have repeated to each other for decades without ever checking the math.

Twenty-Seven Vehicles, One Genuinely Controlled Test

The test took place at NWAPA’s 2017 Mudfest, an automotive media event that gave Fenske access to twenty-seven different all-wheel-drive and four-wheel-drive trucks and SUVs in one location, an unusually large controlled sample for this kind of comparison. Rather than relying on manufacturer specifications or theoretical calculations, he ran each vehicle through a sixty-to-zero mile-per-hour braking test on pavement, using a Vbox Sport data logger to capture precise, repeatable stopping distances rather than eyeballed estimates from the driver’s seat.

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A Vehicle Lineup Built for Real Comparison

The vehicle lineup itself reads like a cross-section of the mid-2010s SUV and truck market: a Lexus GX460, Nissan Armada Platinum, Toyota 4Runner TRD Off-Road, Ford Raptor, Jeep Wrangler Sport, BMW X4M, and roughly twenty others spanning a huge range of tire widths, vehicle weights, and suspension designs. That range matters, because it let Fenske isolate tire width and vehicle weight as variables across a genuinely diverse set of real production vehicles rather than testing a single car on different wheel-and-tire combinations, which is the more common but narrower approach to this kind of question, and one several commenters wished he’d done instead.

The Off-Road Half of the Test Nobody Talks About

The road-only sixty-to-zero test gets most of the attention in the comments, but Fenske also ran a parallel twenty-to-zero mile-per-hour braking test off pavement with the same twenty-seven vehicles, isolating a completely different set of variables. Loose or uneven surfaces change the relationship between tire width and stopping distance in ways pavement testing can’t capture, since a wider tire can either dig in for more bite or float across loose material depending on tread design — a distinction that matters far more to a truck buyer cross-shopping off-road packages than it does to a muscle car owner focused purely on street and strip performance. Comparing the two datasets side by side, on-road and off-road, is part of what makes this test more useful than a single-surface comparison would have been.

What Basic Physics Says Should Not Matter

What the data actually showed, according to commenters who dug into the results, undercuts the simple wider-equals-grippier assumption in a way that surprised a lot of viewers. Basic physics says that, on paper, contact patch size theoretically shouldn’t matter at all — friction depends on the coefficient of friction and the downward force applied, not the physical area of rubber touching the road, a detail more than one commenter says genuinely blew their mind when they first learned it in a physics class, only to spend years afterward trying to reconcile that theory with what tire shops and car culture kept insisting was true.

Why Some Viewers Wanted a Stricter Experiment

Several commenters push back on treating the test results as the final word, pointing out that stopping distance depends on far more than tire width alone: brake system performance determines how quickly wheels can lock up in the first place, while tire compound, suspension tuning, and tire pressure all shape how hard or soft the contact patch behaves under load. One commenter lays out a more rigorous version of the experiment entirely — one vehicle, several tire widths, identical compound and rim size, repeated runs, controlled weather — essentially describing the follow-up study viewers wanted to see rather than a twenty-seven-vehicle comparison across wildly different platforms. That single-variable purity is hard to achieve in the real world, which is exactly why most tire-width debates in car culture never get resolved — everyone is comparing apples to oranges without realizing it.

Why Muscle Car Owners Still Argue About This

Muscle car culture has its own long history with tire width, dating back to the factory bias-ply tires that came standard on cars like the GTO and Charger before wider, stickier radials became the default upgrade through the 1970s and 1980s. That history is part of why the wider-is-always-better assumption runs so deep in the community specifically — for decades, going wider genuinely was the easiest, most reliable way to add grip to a car whose factory rubber was undersized by modern standards. Fenske’s data doesn’t erase that history, but it does complicate the simple version of the story that gets repeated at every cruise night and forum thread without much scrutiny.

The Channel Built on Not Wasting Your Time

That appetite for a more controlled follow-up doesn’t diminish what Fenske’s original test accomplished, and the comments make that distinction clear. One viewer specifically frames the value of Engineering Explained as a channel that includes exactly the information viewers need without padding it out, contrasting that efficiency favorably against paying for what they call inferior-quality lectures elsewhere. That reputation for information density, delivering a genuinely researched answer rather than reciting a repeated car-culture assumption, is precisely why a video ostensibly about SUV braking distances draws sustained engagement from a muscle car and performance-focused audience that might otherwise scroll past it.

What This Actually Means for a Muscle Car Build

For muscle car owners specifically, the practical takeaway sits somewhere between the two extremes the comments argue over: tire width alone doesn’t guarantee more grip the way conventional car-culture wisdom insists, but width still interacts with compound, pressure, and vehicle weight in ways that make a wider, softer-compound tire a genuinely reasonable upgrade in most real-world scenarios, just not for the simple reason most people assume. Fenske’s Mudfest data doesn’t settle the debate definitively, but it does exactly what good engineering content should: it replaces a repeated assumption with actual measured numbers and lets viewers argue about the nuance from there instead of from pure guesswork.

Check out the full video above and let us know what you think in the comments.

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