When should the tyres on the Bobby wheelchair be replaced?
The tyres need to be replaced when the tread depth is less than 1 mm. You should also keep the wheels free of wires, hair, sand, and fibres, and inflate each pneumatic tyre to the correct pressure as indicated on the tyre. Contact your specialist dealer for tyre replacement. (Page 21)
From the official Vermeiren W201461 Bobby Transport Wheelchair manual, page 21
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