I could go an inch more in diameter on the tires and still get the deck low enough to mow, can't go wider though unless I get rims with more "inset", I'm not sure what that's called.
Front and rear suspension would be the best idea ever.
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My Quantum Rehab R-Trak RWD has fully independent suspension which works great. The foam on the foot pads was there because they couldn't be raised high enough for my short legs. I now have a new foot rest assembly that fits me.
I can feel the suspension working when I'm using my chair outside.
Something similar to what my R-Trak has would be great for my mower. My mower doesn't even really need a rear axle as such, each drive wheel could have its own brushless motor. Come to think of it, there's no reason why the front wheels of the mower couldn't have brushless hub motors.
The mower currently uses one large brushless motor to propel itself, and two brushless motors each with their own blade for mowing.
None of the nine powerchairs I've owned or still own (currently four) have had brushless motors, too bad, they'd be much better than what they come with.
With each wheel driven I might have been able to back out of those holes. Sadly the only back wheel what was working to get me out of the hole didn't have the traction to do so, maybe if both back wheels had been spinning I might have gotten out of the holes?
If this wasn't my only mower it would be fun to experiment with suspension and motor setups. Also, the company that owns Hart discontinued my mower last December, my mower is just shy of three years old and now there are no replacement parts available at all. I can get tires and tubes for it at Les Schwab but I can't even buy replacement battery packs now. The mower uses a pair of 80 volt 10 amp suitcase style battery packs wired in parallel.