Pic. 4.29. Tire sidewall marking:
1 - dimension marking; 2 - manufacturer (tradename); 3 - designation of the tread pattern; 4 - designation of a tubeless tire; 5 - radial design; 6 - instructions for execution «with rim protection»; 7 - production date; 8 - certificate number = permission designation; 9 - country of origin; 10 - internal code for the DUNLOP tread pattern; 11 - DOT - Department of Transportation; 12 - DOT code; 13 - maximum allowable load and maximum allowable air pressure; 14 - the number of layers in the middle of the tread and in the sidewall, as well as an indication of the material; 15 - position of wear indicators TW1 (Tread Wear Indicator); 16 - relative service life - wear resistance; 17 - evaluation of braking performance on wet road surface A, B or C; 18 - evaluation of resistance to temperatures A, B or C; 19 - instructions for the safety of operation or installation of the tire; 20 - an indication of «ultra-light construction»; 21 - prescribed direction of tire rotation; 22 - designation of compliance with Inmetro standards.
As an example, in Figure 4.29, there is a bus «Dunlop SP Sport 9000».
Explanation of tire markings
Explanations of tire marking see tables 4.5-4.7.
Rubber valve
The rubber valve is shown in Figure 4.30.
Valve body
The rubber valve for tubeless tires is designed to seal the hole in the rim. The elastic material of the rubber body is firmly pressed into the hole of the rim.
With metal valves screwed in, a rubber gasket seals the joint with the rim. The edge surfaces of the valve opening are also sealing. Therefore, they should be free of rust, dirt and damage.
Valve spool
The spool performs the most important task in the valve. It seals and allows you to adjust the air pressure. The small poppet seal on the spool only seals if it is free of dirt and moisture. Tire inflation compressors must be free of water and oil.
Cap
The cap must always be screwed on the valve. It prevents dirt from entering the valve. If there were impurities in the valve, when the tire was inflated, they would get on the seal of the valve plate and cause leakage.
The valve must be replaced every time the tire is remounted.
When driving without valve caps, there is a risk of dirt getting into them. This will cause the tire to deflate slowly, which can later cause tire failure.
ATTENTION: Tightness is ensured only with a tightly screwed cap.
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