Driving and o peration 149Always use fine-linked chains tha t add nomore than 15 mm to the tyre tread and theinboard sides (including chain lock).Tyre chains may only be used at speeds ofup to 30 mph (50 km/h) 1 ) or up to the tyrechain manufacturer’s rec om mendedmax imum speed, w hichever is lower.When travelling on road s that a re free ofsnow, they may only be used for briefperiods since they are sub ject to rapid w earon a hard road and may sna p.Avoid sharp turns, bum ps and holes anddo not lock the wheels when braking, toavoid damaging the tyre chains.Retig hten the chains after driv ing forapprox. 0.6 miles (1 km). If, at a ny time,you hear or suspect that the chains arecontacting the v ehicle, stop and retightenthe c hains.Always read the instructions supp lied withthe ty re chains.Tem porary sp are wheelThe temporary spare wheel is designed foruse on your vehicle only.Do not a ttempt to use the spare ty re on adifferent wheel, or use a different ty re onthe spare wheel, as they will not fit.For notes on the temporary spare wheel -see p age 174.Ensure the temporary spare wheel isinflated to the c orrect tyre pressure -see p age 215.Wheel changing - see pa ge 174.Roof racks 3For reasons of safety and to av oiddam aging the roof, w e recommend tha ty ou use the Vaux hall roof ra ck systemapp rov ed for y our v ehicle.Fasten the roof rack to the roof railsfollowing the instructions that accompanythe sy stem, ensuring that the roof load isevenly distributed over the side or c rossrails. Loads must not be placed on the roofsurfac e.To prevent d amage or loss, checkfreq uently that roof loa ds are sec urelyfastened .Driving with a roof load affects thevehicle’s centre of g ra vity; drive carefully incrosswinds and d o not d riv e a t hig hspeeds.Driving hints - see page 123.1) Va ries fro m country to country o n account ofnationa l regula tions .9 Warnin gDisregard of the instructions may lead toinjuries or endanger life. Vehiclepasseng ers must be informedaccordingly.