I General User Manual 23The tyre pressure is frequently stated in PSI. ➠ Chap-ter 30 "Technical data" contains a table which you canuse to convert tyre pressures from PSI into bar.17.2 Tubeless tyresTubeless tyres are also used nowadays, especially withmodern mountain bikes, but also with road bikes to a less-er extent. Although the offer a number of benefits, theymust be used and handled with caution.Only use tubeless tyres on suitable rims. These areidentified accordingly, e.g. using the abbreviation"UST".Only use tubeless tyres of the prescribed type and inthe prescribed manner, with the right tyre pressureand, if applicable, using the recommended sealingfluid.Tools must not be used to remove tubeless tyres from therim as otherwise leaks may subsequently occur. If thesealing fluid does not remedy the defect, the valve can beremoved and a normal inner tube used.17.3 Tubed tyresTubed tyres are also used, particularly on bikes used insports competitions. With this tyre type, the inner tubeis sewn into the casing and this unit is glued firmly to thedesignated rim using special adhesive. Tubed tyres offerenhanced safety in the event of a puncture and improvedemergency-running characteristicsOnly use tubed tyres on the designated rims. These donot have turned-up edges (rim flanges) and insteadhave a smooth inwards-curving surface onto whichthe tubed tyre is glued.Only use the tubed tyres of the prescribed type and inthe prescribed manner with the correct tyre pressure.Special skills and a great deal of experience arerequired to glue on tubed tyres. Always have tubedtyres replaced at a professional bike workshop. Findout how to handle tubed tyres correctly and how toreplace them safely.17.4 Inner tubesThe inner tube is necessary to maintain the pressure in-side the tyre. It is inflated via a valve.Three valve types exist:1 2 31 Sclaverand or road valve2 Schrader or car valve3 Dunlop or Woods valveAll three have a cap to protect them from ingress of dirt.
