3,00/3,25-21 TR4 tube Mefo

Material: butyl

Size: 3,00, 3,25-21 // 90/90, 80/100, 90/100-21

Wall thickness: approx. 1.0 - 1.1 mm

Valve type: TR-4

Before putting the tube into the rim, make sure the rim edges are not sharp or crooked, they must not be corroded. The wheel wires must not protrude through the rim, if necessary cover them with protective rubber. Remove dirt with fine sandpaper. Take extra care when fitting, do not use sharp objects - screwdriver etc. You could cut through the soul. Put the valve into the hole in the rim and secure with the nut, check that the valve fits well and then tighten the nut. Gradually push the tube into the tire on both sides while pressing the edge of the tire over the inside of the rim. Then inflate the tire and thoroughly check all sides for leaks. Do not overinflate the tyre! Check the valve for air leaks, replace the valve insert if necessary, remembering that the valve must always be perpendicular to the top.

Check the tyre pressure continuously, replace the tube if defective.