What Does 108T Mean On A Tire? | Load And Speed Decoded

108 marks a 2,205-lb load rating per tire, while T means the tire is rated for up to 118 mph under test conditions.

When you spot 108T on a tire sidewall, you’re looking at the tire’s service description. That short code tells you two things at once: how much weight one tire is built to carry and the speed category tied to that load. It’s one of the fastest ways to tell whether a tire is in the right ballpark for your car, SUV, or van.

The first trap is reading 108T like a model name. It isn’t. The number and letter are functional specs. If you miss that, it’s easy to buy a tire that fits the wheel but does not match what the vehicle was set up to run.

108T Tire Meaning On The Sidewall

The “108” is the load index. The “T” is the speed symbol. Put together, they tell you the tire’s rated carrying ability and rated speed class when the tire is in proper condition and inflated the way it should be for that rating.

For a passenger tire, load index 108 equals 2,205 pounds for one tire. The T speed symbol equals 118 mph. That does not mean you should load a vehicle right up to that figure or treat 118 mph like a target. It means the tire falls into that tested class.

What 108 Means In Real Weight

Load index numbers rise in steps. A 108-rated tire can carry more than a 107 tire and less than a 109 tire. That sounds simple, but people still mix up tire load rating with vehicle payload. They’re not the same thing.

Your vehicle still has its own limits for axle weight, passenger weight, cargo, and cold tire pressure. So yes, four 108 tires add up to a large combined figure on paper, yet your actual loading limit still comes from the door placard and the vehicle maker’s specs.

What T Means In Real Speed

The T symbol sits at the end because it finishes the service description. In plain terms, T is a touring-style speed category used on many family cars, crossovers, and minivans. It is not a badge for grip, ride quality, tread life, or braking distance by itself.

The speed letter is also not a free pass to swap down from a higher-rated tire. If your car came with H, V, or W tires, dropping to T may not match the placard. That can change the way the vehicle feels on the road, especially at highway pace and under load.

Why 108T Sits At The End Of The Tire Code

You’ll usually see 108T after the size marking, like this: 235/65R17 108T. Each part has a job, and the service description comes last because it sums up the load and speed class for that size.

• 235 = tire width in millimeters
• 65 = aspect ratio
• R = radial construction
• 17 = wheel diameter in inches
• 108 = load index
• T = speed symbol

That full string matters. A tire can share the same 108T rating and still be wrong for your vehicle if the size, load type, or construction differs from what the placard calls for. That’s why smart tire shopping starts with the whole code, not the last three characters alone.

Sidewall Marks That Matter Beside 108T

If you want the exact pound figure for each load index, Goodyear’s load index chart lists 108 at 2,205 pounds. For the speed letter, Pirelli’s speed rating chart lists T at 118 mph. Those two references make the code easy to verify when you’re shopping online.

Still, 108T is only one slice of the sidewall story. A few other marks can change how a tire fits, feels, and carries load.

Sidewall Mark	What It Means	Why You Should Check It
235/65R17	Tire size	Must match the size range approved for the vehicle and wheel
108	Load index	Tells how much weight one tire can carry at the rated condition
T	Speed symbol	Shows the tire’s tested speed class
XL	Extra-load construction	May change pressure needs and carrying ability within a size
M+S	Mud-and-snow marking	Common on all-season tires; not the same as a severe-snow mark
3PMSF	Three-peak mountain snowflake	Shows the tire passed a snow-traction test
DOT Code	Plant and date code	Helps you spot tire age and production week
Max Pressure	Sidewall pressure limit	Not the same as the daily cold pressure on the door placard

Where 108T Fits And Where It Doesn’t

A 108T tire is a clean match when your vehicle placard or owner’s manual calls for 108T. That gives you the same load index and speed class the vehicle maker chose. It keeps the choice simple and lowers the odds of a bad fit.

Things get murkier when the placard calls for a different service description. A 108H tire, for one, carries the same load index but a higher speed class. A 107T tire has a lower load index than 108T. Those details look tiny on the sidewall, yet they can change whether the tire is the right pick.

• If the placard says 108T, match it unless your vehicle maker allows a different spec.
• If the placard says 108H or higher, do not assume 108T is an equal swap.
• If the placard says 107T, a 108T tire may be acceptable, but the full size and load type still need to match.
• If you tow, haul, or run a packed family SUV, use the placard pressure and axle limits as your main check.

There’s another wrinkle: some tires add marks like XL after the service description or within the product listing. That can matter on heavier crossovers and vans. So when you compare tires, read the whole listing from size through load type, not just 108T.

Shopping Situation	Is 108T A Good Match?	Why
Your placard says 108T	Yes	It matches the original service description
Your placard says 108H	No, not by default	T is a lower speed class than H
Your placard says 107T	Often yes	The load index is not lower, but size and type still must match
Your tire listing says 108T XL	Check full spec	XL can affect pressure range and application
You carry heavy cargo often	Check vehicle limits	Tire rating alone does not set vehicle payload
You mix 108T with a different rating	Best to avoid	Mixed specs can change handling and fit balance

Common Misreads That Lead To A Bad Tire Buy

A lot of wrong orders happen for the same few reasons. The code looks cryptic, the product title is long, and online listings can bury the service description in small text.

• Reading 108T as a model name: It is a rating code, not a product family.
• Using only the size: A 235/65R17 tire can come in more than one load and speed rating.
• Using only 108T: The right service description can still be wrong if the size or load type is off.
• Using sidewall max pressure as your daily setting: The placard pressure is the number that matches the vehicle setup.
• Assuming four tires times 2,205 pounds equals payload: The vehicle maker still sets the loading cap.

If you’re standing in a tire shop or scrolling through listings, the cleanest move is to compare four things in one glance: size, load index, speed symbol, and any added load marking such as XL. When those line up with the placard, you’re on solid ground.

The Marking In Everyday Use

Here’s the plain reading: 108T means one tire is built for a 2,205-pound load class and a T-rated speed class of 118 mph under test conditions. That is the short answer the code gives you every time you read the sidewall.

For buying and replacing tires, the longer answer is the one that saves money: match the whole tire spec to the vehicle placard. Use 108T as a checkpoint, not the whole decision. Read the size, read the load type, then read the number and letter together. That’s the habit that keeps you from ordering the wrong tire the first time.