When should I replace the tyres on the Bobby wheelchair?

The tyres need to be replaced when the tread depth is less than 1 mm. You should also keep wheels free of wires, hair, sand, and fibres, and inflate pneumatic tyres to the correct pressure as indicated on the tyre sidewall. Contact your specialist dealer for tyre replacement. (Page 21)

From the official Vermeiren W201461 Bobby Transport Wheelchair manual, page 21

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