What Size Tires Does A Moto 4 225 Have? | Stock Fitment

Most Yamaha Moto-4 225 models run 22×8-10 front tires and 25×12-9 rear tires on stock wheels.

If you’re shopping for stock replacement tires, that’s the size combo you’ll see most often for the Yamaha Moto-4 225. The front usually takes a 22×8-10. The rear usually takes a 25×12-9. That gets you close to factory fitment without changing the stance, wheel diameter match, or the way the quad puts power down.

There’s one catch. Some modern fitment pages list a 25×13-9 rear instead. That’s why this question trips people up. A Moto-4 this old may have mixed parts, swapped wheels, or replacement tires from a prior owner. So the stock answer gets you in the ballpark, then the sidewall on your current tires gives you the final word.

What Size Tires Does A Moto 4 225 Have On Stock Wheels?

For the YFM225 Moto-4 models most owners mean, the stock-style setup is 22×8-10 in front and 25×12-9 in the rear. Read that as a 22-inch-tall, 8-inch-wide front tire that mounts on a 10-inch wheel, plus a 25-inch-tall, 12-inch-wide rear tire that mounts on a 9-inch wheel.

That front-and-rear difference is normal. The smaller front tire helps keep steering manageable. The taller, wider rear tire gives the quad more bite when you roll into the throttle. Yamaha built a lot of utility quads this way, so the mismatch in wheel diameter is not a red flag. It’s part of the design.

How To Read The Tire Numbers

Once you know what the code means, ordering gets a lot easier. Each number tells you something different, and the last number is the one you can’t fudge.

• 22×8-10 means a tire that is about 22 inches tall, about 8 inches wide, and built for a 10-inch wheel.
• 25×12-9 means a tire that is about 25 inches tall, about 12 inches wide, and built for a 9-inch wheel.
• The last number must match the wheel diameter exactly. A 9-inch tire does not mount on a 10-inch rim, and a 10-inch tire does not mount on a 9-inch rim.

That last point is where a lot of orders go sideways. A rider sees “25-inch rear tire” and stops reading. Then the tire shows up, and the bead will not seat because the wheel diameter is wrong. Height and width matter, though wheel diameter is the part that decides whether the tire will mount at all.

Why The Rear Size Gets Confusing

Online fitment tools don’t all agree on this quad. Many list the rear as 25×12-9. Some list 25×13-9. That can happen when databases merge stock specs with aftermarket recommendations, roll nearby model data together, or carry old fitment edits forward for years.

If your current rear tire still has a readable sidewall, trust that over a random store listing. If the sidewall is worn smooth, check the frame tag and compare it against the Yamaha Owner’s Manual Library before you order. That extra minute can save you from buying a rear tire that looks right on screen and wrong in the garage.

Moto 4 225 Tire Size By Axle And Rim

This table pulls the stock-sized numbers into one place and shows the checks that matter when you’re matching tires to wheels.

Fitment Point	Size Or Value	What It Tells You
Front tire size	22×8-10	Most common stock-style front fitment for the YFM225 Moto-4
Rear tire size	25×12-9	Most common stock-style rear fitment listed for this model
Front wheel diameter	10 inches	The front tire’s last number has to be 10
Rear wheel diameter	9 inches	The rear tire’s last number has to be 9
Front tire height	22 inches	Keeps steering feel close to stock
Rear tire height	25 inches	Keeps gearing and ground clearance close to stock
Front tire width	8 inches	Helps keep steering lighter than a wider front
Rear tire width	12 inches	Gives the rear axle a broader footprint
Common online mismatch	25×13-9 rear	Worth checking against your current sidewall before buying
Safest buying move	Match the verified size on your machine	Cuts down returns, rubbing, and wheel mismatch headaches

What Changes If You Go Bigger Or Smaller?

A tire size change on an older ATV does more than change the look. Go taller in the rear and you effectively stretch the gearing. That can soften low-speed pull and make the 225 work harder in mud, sand, or steep ground. Go wider in front and the bars can feel heavier at parking-lot speed or on tight trails.

That does not mean a different size is always wrong. It means you should change sizes on purpose. A lot of Moto-4 quads have lived long lives, and many are no longer sitting on their original rubber. If a previous owner changed the wheels or fitted a different rear size that clears well, your job is to buy for the quad in your garage, not for a parts page that guessed from a forty-year-old record.

• Taller rear tires can trim acceleration and ask more from the engine.
• Wider front tires can make steering feel heavier.
• Oversize tires can get closer to fenders, arms, and brake parts.
• Mixed front and rear heights can tilt the quad and change how it feels on uneven ground.

If you want the least-risk replacement, staying near stock is the safe move. That keeps the front 10-inch wheel and rear 9-inch wheel matched to the tire codes you’re ordering. If you want a second fitment check after reading your sidewalls, the ITP tire fitment guide is a solid cross-check for replacement sizing.

When Stock Size Makes The Most Sense

Stock-sized tires fit the way the quad was set up to work. Steering feel stays familiar. Ride height stays close to where it should be. The engine does not get saddled with extra rotating weight it never asked for. That matters on a small utility quad, where a chunky oversize mud tire can make the machine feel lazier than it should.

Stock size is also the easiest route if you use the Moto-4 for trail riding, light chores, or casual property use. You can shop tire tread by terrain instead of wrestling with clearance math, gearing changes, and wheel compatibility all at once.

Buying Checks Before You Order

Before you spend money, do a short garage check. On a machine this old, five minutes with a flashlight can tell you more than ten fitment pages.

Five-Minute Garage Check

• Read the front tire sidewall and write the full size code down.
• Read the rear tire sidewall and check whether it says 25×12-9 or something else.
• Make sure the front wheels and rear wheels are not aftermarket sizes from an old swap.
• Check for rubbing marks inside the fenders and around suspension parts.
• Replace tires in axle pairs if the old set is badly worn or dry-rotted.

Buying Mistake	What Goes Wrong	Better Move
Ordering by tire height only	The tire may not fit the wheel diameter	Match the full code, not the first number alone
Copying another Moto-4 listing	You may pull data from a different 225 setup	Verify the exact size on your machine first
Going wider just because it fits online	Steering can get heavier and clearance can shrink	Stay close to stock unless you know why you’re changing
Mixing one new tire with one old tire on the same axle	The quad can track unevenly on loose ground	Replace in pairs by axle when wear is uneven
Ignoring old sidewalls	Cracks and dry rot can ruin a new setup fast	Check condition, not size alone

The Stock Numbers To Save

If you want the cleanest answer, write down 22×8-10 front and 25×12-9 rear. That is the stock-style fitment most riders are after when they ask about Moto-4 225 tire size. Then stop for a second and read the rear sidewall on your own quad, because that’s where the odd 25×13-9 listing can show up in the wild.

Once those numbers match your wheels, the rest gets easy. You can shop tread style, ply rating, and terrain use with a lot more confidence. Get the diameter match right first, keep the front and rear wheel sizes straight, and your Moto-4 225 will be a lot easier to buy for.