Continental CS Easy Instructions De Montage page 17

Be careful when loosening the attachment bolts not to allow the tire
to slip off the rim. Solid rubber tires are heavier than they appear
and can cause serious personal injury if dropped. Two people may
be required to do the job safely.
All CSEasy CLEAN tires are electrically non-conductive. Electrostatic
discharges in the presence of hazardous materials may cause fire
and explosions. The vehicle must therefore be earthed in another
suitable way following consultation with the supervisory authorities.
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