Those are not good wheelchairs for independent people to spend 16+ hours in.
I work in EMS and see all kinds of "budget" wheelchairs and they'll all shit.
The parts alone for this lightweight chair have to crack $300.
Wheelchair market is ripe for IKEA.
I don't doubt it, but just out of curiosity, could you elaborate the ways in which they're shit?
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Don't forget labor: welding lightweight, exotic materials requires a lot of experience, as every imperfection in the weld will lead to it cracking with time, which would be extremely dangerous.