Scag 485207 Caster Wheel Assembly 11 x 4.00-5 for Mowers / 483409

What It Is

The Scag 485207 Caster Wheel Assembly is a factory replacement for the front caster wheels on Scag zero-turn mowers. It uses an 11 x 4.00-5 tire and is designed to support the front end of the mower during turns and over uneven terrain.

Fitment & Compatibility

• OEM number: 485207 (supersedes 483409).
• Primary fit: Scag zero-turn mowers with a front caster setup using an 11 x 4.00-5 tire and a 5/8" axle bore.
• Check your deck size: Common on 48", 52", 61", and 72" decks, but verify your mower model year—some older models use a different bearing spacing.
• Measure your existing assembly: Confirm the wheel width (4 inches) and overall diameter (11 inches) match. Also measure the caster fork width to ensure the wheel fits without binding.
• Aftermarket note: This is an OEM Scag part. Aftermarket alternatives exist (e.g., Oregon) but may use different bearings or tread patterns. Stick with OEM for guaranteed fit on current-model Scags.

Key Things to Know

• Quality: OEM Scag wheels use a sealed bearing that holds up better to debris and moisture than budget aftermarket wheels.
• Installation difficulty: Moderate. You’ll need a jack or blocks to lift the mower front, a socket set, and possibly a puller if the old wheel is seized. Expect 30–60 minutes.
• Common gotcha: The caster fork nut is often rusted or overtightened—soak with penetrating oil first. Also, check the caster stem and fork for wear; if the fork is bent, replacing just the wheel won’t fix wobble.
• Tread pattern: This is a smooth ribbed tire, not a turf-saver. It’s fine for flat lawns but may spin on wet grass or loose soil.

Should You Buy It

If you own a Scag zero-turn and need a direct-fit, durable replacement for a worn or damaged front caster, this OEM assembly is the right choice. It’s a no-guesswork swap that matches factory specs, but if your caster fork is also worn, budget for both parts. For lighter-duty mowers or tighter budgets, an aftermarket wheel may suffice, but you’ll sacrifice some longevity.