The Porsche entry for the VK4501 was called Type 101 or SonderfahrzeugII at the factory, but the electrifying effect of the Leopard name given to their previous tank inspired the christening of the new one with another predatory feline name, the "Tiger".
The Leopard was similar to the porsche Tiger in some technical details, but its road wheels were rubber rimmed, of increased diameter and the return rollers were deleted. To economize on copper (but mostly to counter balance the heavy turret) the drive sprockets andtheir electric motors on the Porsche Tiger were relocated to the rear of the hull. Without this change, the center of balance would have been too far forward. The Porsche suspension was still insufficiently developed and simply unsuitable for such a heavy vehicle. Six road wheels on widely spaced bogies made the ground pressure (already much higher than the Henschel interlocking wheels layout) vary along the length of the track, resulting in the tank bogging in the soft ground. However, the VK4501 (P) was still suspended with the revolutionary Porsche longitudinal torsion bar system, resulting in constant breaking of the bars under field conditions.
The Tigers' weight made their repair extremely difficult. Despite the relocation of the drive sprocket to the rear, the front sprocket still carried teeth and was nearly identical to the rear one. The purpose of such an arrangement was to facilitate the adjustment of the slack track (the long length of which was hanging unsupported over the road wheels).
And so,
The friction of the hanging tracks guide teeth on the road wheels quickly wore out their rubber tires, so the road wheel design had to be changed.
The new wheels had steel tires mounted on springs with rubber ring bushings-to some extent inspired by the similar construction of the Soviet all-steel wheels used on T-34 and KV tanks. These had much more service life in them, at the same time reducing the need for rubber which was already in very short supply.Rubber conserving road wheels were frequently used on various later models of German tanks. This was about the only feature of the Porsche tank that saw any wide distribution during the war.
And having said all that..........DON"T SHOOT!
...........And after some more digging
Here's this old post from over 11 years ago pertaining to this subject.