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Flatbase wheel: BBS Racing Wheels with 16 bolts centre sections and 13˝ rims as well as 20 bolts centre sections and 15˝ rims are named a flatbase wheel. Because of the equal diameter of the flatbase wheel's shape, it is not possible to mount or remount a tyre on a flatbase wheel as usual! The wheel has to be disassembled for tyre changing and then reassembled on the tyre! Otherwise damage is caused! First bolts should be tightened lightly and the wheel centres should be centred exactly (there may be 0.7 to 0.8 mm / 0,028 - 0,031˝ space between center and rim). Then the bolts/nuts have to be thightened crosswise up to 10 Nm (7,4 lbf ft / 88,5 lbf in) and finally to 15 - 17 Nm (11 - 12,5 lbf ft / 133 - 150 lbf in). To change tyres later, first the tyre's flanks should be pressed over the rim's humps (by machine), than the wheels can be disassembled to take off the tyre. Note: Use new sealing rings and new rim bolt sets everytime the wheels are reassembled. Flatbase wheels always are delivered in pieces – for self assembling. |
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Drop-centre wheel: BBS Racing Wheels with 12 bolts centre sections and 13˝ rims as well as 16 bolts centre sections with 14˝ or 15˝ rims, 20 bolts centre sections with 16˝ or 17˝ rims and 24 bolts centre sections with 18˝ or 19˝ rims are named a drop-centre wheel. Because of the smaller diameter in the middle of the drop-centre wheel's shape a tyre can be mounted in the usual way as on a road wheel. Drop-centre wheels will always be delivered completely assembled at no extra charge. |
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