Exmark 105-1863 Caster Wheel Quest

What It Is

The Exmark 105-1863 is an OEM caster wheel assembly designed for the front of Exmark Quest zero-turn mowers. It replaces a worn or damaged front wheel to restore smooth steering and even deck height.

Fitment & Compatibility

Before buying, confirm your mower is an Exmark Quest model (not Lazer, Turf Tracer, or other series). This wheel fits both 42-inch and 48-inch deck Quest models. Measure the existing wheel’s overall diameter (typically 11 inches) and the axle bolt hole size (usually 3/8 inch). Check that the wheel’s offset and mounting bracket match your mower’s fork—this assembly includes the tire, wheel, and bearing, but not the fork or hardware. If your mower is a 2009 or newer Quest, it’s likely compatible; older models may require verifying the part number supersession.

Key Things to Know

• Quality: OEM Exmark part, not aftermarket—expect exact fit and durable rubber tire, but costs more than generic alternatives.
• Installation: Easy if you have basic tools (socket wrench, jack or blocks to lift mower). Takes about 15 minutes per wheel.
• Gotcha: The wheel assembly includes a sealed bearing, but the axle bolt and locknut are often sold separately—check if yours are reusable or need replacement (Exmark part 105-1863 does not include them).
• Common issue: If the mower pulls to one side or the front end wobbles, replace both caster wheels as a pair to maintain even wear and steering alignment.

Should You Buy It

Buy this Exmark 105-1863 if you own an Exmark Quest and want a guaranteed OEM fit with no modifications—ideal for restoring front-end stability and preventing scalping. Skip it if you’re on a tight budget (aftermarket wheels cost ~$30 less) or if your fork or axle is damaged, as this is just the wheel assembly.