four-wheeler
US /ˌfɔːrˈwiː.lɚ/
UK /ˌfɔːrˈwiː.lɚ/

1.
a vehicle with four wheels, especially an all-terrain vehicle (ATV)
:
•
He rode his four-wheeler through the muddy trails.
•
They went on a guided four-wheeler tour in the mountains.
a vehicle with four wheels, especially an all-terrain vehicle (ATV)