Yamaha YZ 125 Tire Size
GarageDex's powersports data shows the Yamaha YZ 125 runs a 80/80-M21 front tire and a 100/90-M19 rear tire. Tire sizes vary by year - see the table for each range.
Tire fitment by year
| Years | Front tire | Rear tire |
|---|---|---|
| 2007 | 80/80-M21 | 100/90-M19 |
| 2006 | 80/90-M21 | 100/90-M19 |
| 2005 | 80/80-21 | 100/90-19 |
| 2004 | 80/90-21 | 100/90-19 |
| 2002 | 80/100-21 | 100/90-19 |
124cc. Tire sizes read as width / aspect ratio - rim diameter. Match all three numbers to the rim.
Tires for your Yamaha YZ 125
This bike runs a 80/80-M21 up front and a 100/90-M19 at the rear. Match the size stamped on the sidewall (or shown in the table) - powersports tires are size-specific, so the numbers matter more than the brand.
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Frequently asked
What tire size does a Yamaha YZ 125 use?
GarageDex's powersports data shows the Yamaha YZ 125 runs a 80/80-M21 front tire and a 100/90-M19 rear tire. Tire sizes vary by year - see the table for each range.
What do the tire numbers mean?
A size like 80/80-M21 reads as tread width (mm) / aspect ratio (% of width) - rim diameter (in). Match all three so the tire fits the rim and clears the swingarm and fender.
Do the Yamaha YZ 125 tire sizes change by year?
Yes - fitment differs across the years we cover: 2007 runs 80/80-M21 front / 100/90-M19 rear; 2006 runs 80/90-M21 front / 100/90-M19 rear; 2005 runs 80/80-21 front / 100/90-19 rear; 2004 runs 80/90-21 front / 100/90-19 rear; 2002 runs 80/100-21 front / 100/90-19 rear. Match your exact year in the table.
Can I fit a different tire size?
Stick to the stock size - it's matched to the rim width, speedometer, and handling. A wider tire can rub the swingarm or fender and throws off the speedo, so only deviate on a shop's advice.