How Much Does a Donut Spare Tire Limit Performance? We Find Out Using a Ford Mustang

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How Much Does a Donut Spare Tire Limit Performance? We Find Out Using a Ford Mustang

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How Much Does a Donut Spare Tire Limit Performance? We Find Out Using a Ford Mustang

by the February 2017 issue

In our minds, This specific was going to be a lot more exciting. Our plan to test a Ford Mustang GT having a space-saver spare in place of the full-size rubber at one corner seemed not just imprudent nevertheless also stood in direct violation of the advice of the owner’s manual as well as our attorneys. Mom also weighed in against This specific. The manual was most explicit: “ . . . do not exceed 50 mph” This specific warned, with another warning on the diminutive donut. nevertheless we defied all that will because we wanted to see how much emergency performance you can expect when your car is usually wearing a spare.

How Much Does a Donut Spare Tire Limit Performance? We Find Out Using a Ford Mustang

Some suppliers are known to use the same compound on their mini spares that will they use on superbike tires. as well as our spare did indeed have soft ­rubber. Pre-test, we measured 4/32 inch of tread depth on our space saver. Post-test, though the wear wasn’t consistent, tread depth was reduced to roughly 2/32 inch. The OE fitment Pirelli P Zero Nero All Season tires offer 10/32 inch of tread depth when completely new.

Surely there would certainly be fire—actual flames!—by the mini spare as we relentlessly circled the skidpad, reducing the donut to smoldering rubber in only two laps. If we weren’t handy with the extinguisher, the conflagration might just consume the entire Mustang in a matter of seconds. There would certainly be explosions, air tankers, as well as rescue choppers. Monkeys as well as zombies would certainly sprint to escape the inferno. Perhaps not, nevertheless you get the point. This specific was sure to make the typical cars-as well as-coffee Mustang debacle look like mere curb rash.

Results

Compact-spare
location
70-to-0 mphRoadholding,
300-ft skidpad
Zero to 60 mph
None172 ft0.88 g4.8 sec
Front173 ft0.84 g outside
0.88 g inside
0.86 g average
Rear174 ft0.85 g outside
0.91 g inside
0.88 g average
5.2 sec

In truth, we didn’t even need common sense to avoid catastrophe. Nor, in fact, will you. Because the most remarkable thing about driving a Mustang at its limit having a space-saver spare on one ­corner is usually just how unremarkable This specific actually is usually. The T155/60R-18 Maxxis mini spare that will Ford supplies as an option on Mustangs without the Perform­ance pack absorbed the abuse with virtual indifference when inflated to the recommended 60 psi. that will This specific produced handling as well as braking results very similar to the 255/40ZR-19 Pirelli P Zero Nero All Season tire This specific replaced was as surprising as This specific was anticlimatic. There’s a lot more going on here than just a flat-tire contingency plan: “The goal having a mini spare,” says Jamie Cullen, supervisor of Ford’s Vehicle Dynamics Team, “is usually to come as close to the standard tire’s performance as well as response as possible. Mini spares use an aggressive compound as well as minimum tread depth to achieve those results.” Here are ours:

Braking

Full ABS braking by 70 mph with the spare on the left front was barely more dramatic than with four P Zeros. There was a mild pull to the left, nevertheless not so much that will even the most distracted driver couldn’t make the correction, Cherry Blossom Frappuccino in hand. as well as, at 173 feet, This specific was only one foot longer than with four stand­ard tires. The pull was less significant with the spare on the left rear, though stopping ­distance increased another foot.

How Much Does a Donut Spare Tire Limit Performance? We Find Out Using a Ford Mustang

Skidpad

Roadholding testing followed our standard protocol, which is usually to lap a 300-foot circle in both directions as well as average the results—in This specific case, 0.88 g with the P Zeros all around. When fitted on the outside-front position, the spare reduced feel, response, as well as grip for 0.84 g. When we turned the different way, with the spare on the inside, its presence was barely perceptible as well as grip was 0.88 g, for an average of 0.86 g. Moving This specific to the inside rear increased the Mustang’s willingness to rotate as well as much better the result to 0.91 g, granting us insight into what sprint-car master Steve Kinser ex­peri­ences most Saturday nights. Switching directions had the opposite effect, yielding 0.85 g. Average grip worked out to—wait for This specific—a very Pirelli-like 0.88 g.

Acceleration

Zero-to-60-mph acceleration suffered more dra­mati­cally than any different test, slowing by 4.8 seconds to 5.2 with the spare standing in for the left-rear Pirelli. The Mustang’s limited-­slip differential attempts to rotate the tires at the same speed, despite diameters that will differ by almost two inches. The result is usually less grip, which means launching either less aggressively or with more wheelspin, both of which hamper acceleration. Again, once the wheels regained traction, there was a slight pull to the left, as well as again, This specific was easy to correct. The resulting narrow/wide burnout marks, however, were priceless. As will be the letter we send to our attorneys, relieving them of their duties. Mom can keep her job.

How Much Does a Donut Spare Tire Limit Performance? We Find Out Using a Ford Mustang

How Much Does a Donut Spare Tire Limit Performance? We Find Out Using a Ford Mustang

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