Harley-Davidson Fat Boy Tire Size
GarageDex's powersports data shows the Harley-Davidson Fat Boy runs a MT 90-16 front tire and a MT 90-16 rear tire. Tire sizes vary by year - see the table for each range.
Tire fitment by year
| Years | Front tire | Rear tire |
|---|---|---|
| 1992 | MT 90-16 | MT 90-16 |
| 1990-1991 | 130/90-16 | 130/90-16 |
1337cc. Tire sizes read as width / aspect ratio - rim diameter. Match all three numbers to the rim.
Tires for your Harley-Davidson Fat Boy
This bike runs a MT 90-16 up front and a MT 90-16 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 Harley-Davidson Fat Boy use?
GarageDex's powersports data shows the Harley-Davidson Fat Boy runs a MT 90-16 front tire and a MT 90-16 rear tire. Tire sizes vary by year - see the table for each range.
What do the tire numbers mean?
A size like MT 90-16 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 Harley-Davidson Fat Boy tire sizes change by year?
Yes - fitment differs across the years we cover: 1992 runs MT 90-16 front / MT 90-16 rear; 1990-1991 runs 130/90-16 front / 130/90-16 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.