133Wheels, tyresSome brands of tyres have a beaded edgefor alloy wheels to protect againstdam age. If wheel trim is used on steelwheels with bead ed-edge tyres, c om plywith the following:z The use of wheel trims and tyres tha tVauxhall has approved for the vehicleand therefore fulfill all requirements forthe relevant combination of wheels andty res.z If the wheel trims and tyres used are notVauxhall-approved, the tyres m ust nothav e a bea ded edge.Tyre pressureCheck ty re pressure, including the spa rewheel, at least ev ery 14 day s and prior toany long journey; the ty res should becheck ed when cold. Don’t forget to checkthe spare 3.Use the valv e cap key to m ake unscrewingthe valve ca ps easier. The k ey is located onthe inside of the ta nk flap.Ty re p ressure – see pages 205, 206.Do not reduce ty re pressure when the tyresare wa rm. O therwise the pressure maydrop b elow the perm issible minimum whenthe tyres cool down.After having chec ked the tyre pressure,tig hten the va lv e ca ps using the v alve capkey .Incorrect inflation pressures will impairsafety, vehicle handling, comfort and fueleconom y and w ill increase tyre wear.Pressure that is too low can result inconsid erable tyre warm-up and interna ldam age, lead ing to tread separation andeven to ty re blow-out at high speeds.Hidd en tyre dama ge is not elim inated byadjusting the tyre pressure.9 WarningUse of unsuitable tyres or wheel trimscould lead to sudden loss of air andthereby accidents.9 Warnin gIncorrect ty re pressure could lead to a flattyre.