No, they are not legal, they are motorized vehicles and therefore illegal to use on game lands. § 135.1. Scope.
This chapter regulates and controls the use and administration of lands, waters and buildings under Commission ownership, lease or jurisdiction.
The provisions of this § 135.1 adopted June 3, 1969; reserved June 18, 1982, effective June 19, 1982, 12 Pa.B. 1869; amended June 19, 1987, effective July 1, 1987, 17 Pa.B. 2464; amended June 11, 2010, effective June 12, 2010, 40 Pa.B. 3095. Immediately preceding text appears at serial page (326569).
§ 135.2. Unlawful actions.
In addition to the prohibitions in the act on lands, waters or buildings under Commission ownership, lease, agreement, control or jurisdiction, it is unlawful, except with the permission of the person in charge of the lands, or the written permission of the Director to:
(1) Camp or use campsites.
(2) Plant, gather, cut, dig, remove or otherwise injure plants or parts thereof, including trees, shrubs, vines, flowering plants, cultivated crops, mushrooms and fruits of berry-producing plants.
(3) Travel on lands by means of vehicle or conveyance propelled by motorized power.
People who cannot walk can get a permit to use an atv or motorized wheelchair on certain game lands. If you can ride a bike I doubt you would qualify.
When you are up to your butt in alligators, it is hard to remember your intent was to drain the swamp. Stay focused!