Piper is an active wheelchair made with 1" diameter PVC. Therefore, it is only suitable for people under 150 lbs (this is a guess). Heavier people should use 1.25" or 1.5" diameter PVC. 

Piper features two 4" caster wheels in the front and 24" x 1" street tires on 540 rims for the rear wheels. The frame weighs about 20 lbs (not including the rear wheels). Piper features an aftermarket padded aluminum backrest that has up/down adjustability.

My prototype model has a 14" wide seatpan which is my size. I typically use 25" wheels, but since 24" (540) are more common, the frame is based on 24" x 1" wheels. The wheel size can be modified as desired.

I am using (pre-bent) large grey 90 degree elbows for the curved part of the leg supports. I used a heat gun to reduce the angle from 90 to 75 degrees to allow for 15 degrees of dump. There is a "brake bar" which can be use to hold the brackets for either upper mounted or lower mounted undermount brakes (wheel-locks).

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