Wheels for rowing machine

Wheels for rowing machine with a moving seat. And the bar which go between wheels.
The wheels do 36mm diameter by 16mm height (or 15mm, it depend if the 16mm doesn't fit well with your seat).

These wheels fit with a lot amount of rowing machine.

You can use these standard ball-bearing: http://www.amazon.fr/gp/product/B00JE78F5M?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00

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Roues pour rameur scandinave, av