Dunlop Motorcycle Tires Code

Unsafe Motorcycles: Motorcycle Tires: Age Matters

Motorcycle Tires: Age Matters

at 8:16 AM .

You've Gotta Know the Date the Tire was Born

By Billy Edwards

Tire aging on cars has received attention recently, but I haven’t seen much of this information directed to motorcycle riders. One reason may be that m-motorcycle tires wear out much quicker than car tires – while a drive may rack up as much as 50, 000 miles or more on car tires, we motorcyclists typically get 7, 000 - 10, 000 miles on our motorcycle tire. So for some, the motorcycle tire may not last long enough – from a chronological age standpoint – to worry about.

But … many of us may not put that much mileage on our motorcycle tires if the motorcycle is not our primary vehicle (you know, it’s just hard to take the kids to Grandma’s on a motorcycle), so it may take several years. Additionally, we generally don’t know the age of the tire when it’s put on our bike. This isn’t to say your dealer sold you a used tire instead of a new one. It’s just that from a tire aging standpoint, the tire begins to age as soon as it is born, which is when it comes out of the vulcanization press at the tire plant.

Basically, exposure to oxygen, ultra violet light (sun light), heat, and use all work to break down, wear out and harden the rubber compound used in the tires, whether the tire is on a bike or not.

How Old is Too Old?

So how old is too old? Well, it seems that there’s some debate about it. Some say ten years, some say six years. Some car tire companies and most safety advocates go with six years. Unfortunately, tire aging information from the tire companies is hard to come by. I’ve looked on both the Dunlop and Metzler motorcycle tire websites and I don’t find any information about tire aging.

For me, I’m going to stick with the 6-year guideline as a hard line, and if I’m somebody who likes to ride on the highways at highway speeds (and I am), I’m going to start getting uncomfortable at about three or four years.

Now that you’ve decided on your age limit, how do you determine how old your tire is? And the answer ain’t the date you bought it. You’ve gotta know the date your tire was born.

Tire Birthdates

Here the U.S. Department of Transportation comes to the rescue with its Tire Identification Code, stamped into every tire as it’s manufactured. The code is a combination of numbers that identifies the manufacturing location, tire size, manufacturer's code, and week and year the tire was manufactured. You can find the code on the sidewall of the tire, like the one pictured below.

(To figure which week, divide by 4.3. Nailing it to the exact week isn’t necessary – if you get the correct month, or even within a month of the correct month, a tire is probably going to be OK as far as age goes. In other words, running it 6 years or running it 6 years and 1 month isn’t that much difference.)

Amaze Your Friends
Hopefully, nobody’s riding around on tires more than six years old, so information about tires older than 2000 isn’t necessary. But, just to be complete: tires manufactured during the 1980s had a three-digit code for the date, with the first two digits indicating the week, and the last digit indicating the year (355 would mean the 35th week of 1985) and tires manufactured in the 1990s had a three-digit date code but with a little triangle (Δ) after the code. So don’t ride on a tire from the 1980s or 1990s, but now you can amaze your friends by telling them exactly how old the tire is in the old tire swing in the back yard.


luxury safaris
2008-03-16 19:18:24 by lrdoflamancha

I want some of what ever this guy is smoking.

2000 Yamaha Royal Star Venture - MINT
Original Owner since new, ALWAYS Garaged, Very well maintained, Synthetic Motorcycle Oil in Engine and Synthetic Gear lube. New Battery
Brand New Front & Rear Dunlop Tires, Front Brakes and Rear Rotor and Brakes
Only 21,000 miles, 1294cc V4 ( from each side has look of Big V-twin)
I have 2 Yamaha windshields, 1 Large, 1 slightly smaller, Added Yamaha Light Bar and rear chrome luggage rack. GORGEOUS two tone red.
AM/FM/Cassette - 4 speaker system /CB,Cruise Control, also has driver and passenger plugs for helmet communication system


http://dogobediencetraining93.yolasite.com/
Dunlop Dunlop American Elite HD Touring Tire - Rear - 180/65B16, Position: Rear, Speed Rating: H, Load Rating: 81, Tire Application: Touring, Tire Size: 180/65-16, Tire Construction: Bias, Tire Type: Street, Rim Size: 16 31AE57
Automotive Parts and Accessories (Dunlop)
  • NOTE - SAFETY WARNING: For information on tire care, safety, maintenance, mounting, manufacturers warranty and other information consult tire manufacturers publication(s)...
  • Premium replacement H-D touring tires
  • The only replacement motorcycle tire for Harley-Davidson bikes that is designed in America, made in America and tested in America
  • Multi-Tread (MT) rear tire built with long-wearing compound in center of tread and lateralgrip compound in each shoulder to maximize cornering performance
  • All-new tread design provides even tread wear and quiet operation in all conditions, both wet and dry
Dunlop Dunlop Harley-Davidson D402 Tire - Front - MT90B16 TL - Wide White Wall, Speed Rating: H, Tire Type: Street, Tire Construction: Bias, Position: Front, Tire Size: MT90-16, Rim Size: 16, Load Rating: 72, Tire Application: Touring 302291
Automotive Parts and Accessories (Dunlop)
  • NOTE - SAFETY WARNING: For information on tire care, safety, maintenance, mounting, manufacturers warranty and other information consult tire manufacturers publication(s)...
  • Engineered and tested with Harley-Davidson to provide maximum performance for touring bikes
  • 3-ply polyester casing with 2 fiberglass belts for greater load-carrying capability and stability
  • Offset center groove improves confidence in wet conditions
  • Made in USA
Dunlop Dunlop American Elite HD Touring Front Motorcycle Tire NWW 130/80-17 32AE81
Automotive Parts and Accessories (Dunlop)
  • Premium replacement H-D touring tires
  • The only replacement motorcycle tire for Harley-Davidson bikes that is designed in America, made in America and tested in America
  • Multi-Tread (MT) rear tire built with long-wearing compound in center of tread and lateralgrip compound in each shoulder to maximize cornering performance
  • All-new tread design provides even tread wear and quiet operation in all conditions, both wet and dry
  • H-rated for speeds up to 130 mph

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