the chair is so sweet I had to get two.
I don't have the original gw wheel to compare to, but from putting the buffalo wheel up to the wing forks the width looks spot on and the axle nuts on the buffalo wheel are a touch too large to fit in the clamps. the buffalo axle itself is 15mm. the axle nuts are 22mm. the clamps on the wing forks are about 20mm. what you see in the picture weighs in at about 28 lbs on my bathroom scale.