HOMCOM 371-041BK Owner's Manual page 59

Tyres
Inspect
is smooth and even.
Check for broken or loose spokes.
Tread
cuts and damage.
Valves
Frequency: Inspect and maintain at least each use.
Maintenance
"Fixing a Flat Tire" for more detail.
Reduce air pressure in the tube and re-seat the bead.
bearings need repair see a scooter mechanic for repair.
See bicycle mechanic for repair.
Clean dirt from the valve.
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