interior, no fan assisted ground effect and no dynamic rear wing—giving the McLaren F1 LM a total mass of . Engine The F1 LM also used the same engine as the 1995 F1 GTR without the race-mandated restrictors. The engine has a compression ratio of 11.0:1 and produces at 7,800 rpm. It has a peak torque of at 4,500 rpm; the redline is at 8,500 rpm. The total weight and horsepower of the car gives it a weight to power ratio of 0.29 hp/lb. Aerodynamics The aerodynamics of the LM is directly derived from the GTR race car. The bodywork of the vehicle has the addition of a larger cooling duct at the nose of the machine and cooling ducts on either side of the car for the brakes where the storage lockers are seen on the standard F1. In the place of the small dynamic rear wing seen on the regular F1 there is a considerably larger, manually adjustable CFRP rear wing mounted on the back of the vehicle, it has a CFRP splitter at the front, side skirts and extensions for the wheel arches to increase downforce and thus give the car more grip. The car also features the diffuser from the GTR race car. Tyres The McLaren F1 LM uses Michelin SX-MXX3 tyres and features specially-designed 18-inch (457 mm) magnesium alloy wheels. The tyres at the front are 275/35 ZR 18, while at the rear 345/35 ZR 18. The front wheels are 10.85 x 18 inches and at the rear 13.00 x 18 inches. Brakes The carbon ceramic brakes on the GTR are not present on the LM, the front and rear calipers on the brakes are four-piston monobloc light alloy callipers, ventilated using the cooling system from a 1995 F1 GTR. Gearbox, clutch and miscellaneous The LM has an upgraded gearbox with gun drilled driveshaft derived from the F1 GTR, tripod CV joint and straight cut gears, although the gear ratios are identical to the standard F1, i.e. 3.23:1, 2.19:1, 1.71:1, 1.39:1, 1.16:1, 0.93:1, with a final drive of 2.37:1. The LM does not benefit from the magnesium gearbox casing of the 1996 F1 GTR. The clutch of the LM is a hydraulic remote actuation triple plate carbon/carbon clutch, the clutch is 200 mm (7.87 in) in diameter. The F1 LM has a fuel tank capacity of . Performance The F1 LM is considered the quickest