Top speed 107mph?

[GETSCHWIFTY]

It’s a giant brick. I mean… 107 is fast. For a vehicle shaped like a brick

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[drew707]

Sometimes I think learning tire load limits and speed ratings should be part of getting your drivers license....

Spending my early days in a tire development lab testing everything from donuts to mud grips, speed ratings have quite a safety factor especially with todays technology. I don’t know if it changed (14 years ago now) but for us (independent facility) it was a minimum of 15 minutes at above a target rating with variations in speed but not going below the rating, at 100° F ambient temp. And I will say that the safety margin was generally absolutely massive. For “science” we sometimes would take tires up to 250 mph until they’d blow. Even quality brand street tires you’d get on something like a fusion not meant to go fast would hold up for quite a while. Sub 175 we could never get a catastrophic failure unless there was a manufacturing defect. That’s not to say it doesn’t degrade the integrity or lifespan because I’m certain it does but I’ve never seen a tire just spontaneously explode in lab conditions when going over it’s rated speed. Also not saying that it won’t happen at all.

Also this isn’t advice by any means. Just because I’ve driven my whipple raptor 160 mph on BFG’s on backwoods roads countless times doesn’t make it safe or absolute. It’s definitely stupid. If I learned anything in life it’s that if I can’t be a good example at least I can be the bad one.

 

[Ksjrb03]

Mine tops out at 101. Lame.

 

[nomnom]

With a headwind of 30mph, my top speed this morning was about 65

 

[mybikeisred]

Out of curiosity, what makes the governor kick in to limit your speed? Does it go by mph or rpm? Is there a way to change the limit or eliminate it with forscan? I believe you can use forscan to correct your speedometer by changing the tire circumference. Could you enter a smaller circumference to trick the speedometer into thinking you’re going much slower so it would allow a higher top speed?

 

[zombie]

Out of curiosity, what makes the governor kick in to limit your speed? Does it go by mph or rpm? Is there a way to change the limit or eliminate it with forscan? I believe you can use forscan to correct your speedometer by changing the tire circumference. Could you enter a smaller circumference to trick the speedometer into thinking you’re going much slower so it would allow a higher top speed?

They are usually speed limited, not RPM.

 

[Moto26]

From Discount Tire:
Speed Rating Maximum Speed
B Up to 31 mpg
C Up to 37 mph
D Up to 40 mph
E Up to 43 mph
F Up to 50 mph
G Up to 56 mph
J Up to 62 mph
K Up to 68 mph
L Up to 75 mph
M Up to 81 mph
N Up to 87 mph
P Up to 93 mph
Q Up to 100 mph
R Up to 106 mph
S Up to 112 mph
T Up to 118 mph
U Up to 124 mph
H Up to 130 mph
V Up to 149 mph
W Up to 168 mph
Y Up to 186 mph
Z 149 mph and over

Why can’t I buy an X-rated tire? (Asking for a friend)

 

[mybikeisred]

They are usually speed limited, not RPM.

So am I correct that you could change the tire circumference in forscan to show that you’re going slower than you are, and it would result in a higher top speed? Or could you just put bigger tires on without adjusting the speedometer to get a higher top speed? Maybe a higher ring and pinion gear ratio?

 

[mybikeisred]

Why can’t I buy an X-rated tire? (Asking for a friend)

Cuz all the X-rated rubber is used for condoms and sex toys.

 

[BroncoMax21]

I'm envisioning an event horizon where reaching 108+mph would flip the fuel mileage into negative numbers?

 

[Moto26]

I'm envisioning an event horizon where reaching 108+mph would flip the fuel mileage into negative numbers?

Ahh… the “Zero MPG” barrier.

 

[AK SNO RIDER]

Spending my early days in a tire development lab testing everything from donuts to mud grips, speed ratings have quite a safety factor especially with todays technology. I don’t know if it changed (14 years ago now) but for us (independent facility) it was a minimum of 15 minutes at above a target rating with variations in speed but not going below the rating, at 100° F ambient temp. And I will say that the safety margin was generally absolutely massive. For “science” we sometimes would take tires up to 250 mph until they’d blow. Even quality brand street tires you’d get on something like a fusion not meant to go fast would hold up for quite a while. Sub 175 we could never get a catastrophic failure unless there was a manufacturing defect. That’s not to say it doesn’t degrade the integrity or lifespan because I’m certain it does but I’ve never seen a tire just spontaneously explode in lab conditions when going over it’s rated speed. Also not saying that it won’t happen at all.

Also this isn’t advice by any means. Just because I’ve driven my whipple raptor 160 mph on BFG’s on backwoods roads countless times doesn’t make it safe or absolute. It’s definitely stupid. If I learned anything in life it’s that if I can’t be a good example at least I can be the bad one.

Of course there's a safety margin and always appreciate some info from someone in the industry.

It would however be foolish for an OEM to allow a vehicle to go over the tire manufacturers limit, just from a liability standpoint. Especially here in America where you can sue for being stupid and win.

I'm not sure I would trust either of the Broncos roof options at speeds much over the limiter anyway!

 

[Moto26]

Which reminds me…

The other day, I was at the gas station filling up the Bronco. I put in 10 gallons… then 20… 30… still going… 40 gallons and counting! The guy next to me says “Maybe you should shut the engine off.”

 

[BroncoMax21]

Ahh… the “Zero MPG” barrier.

LOL I mean it's funny in my head at least. 18mpg at 60mph. 5mpg at 90. 1mpg at 101. Then *poof*... vapor

 

[Lonescout]

I'm envisioning an event horizon where reaching 108+mph would flip the fuel mileage into negative numbers?

That would only happen when you were reaching the speed of light... E=MC^2

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