Ducati 749R
This uncompromising sports machine is only available in the single-seat version and is the perfect bike for all those who want to own a real middleweight racer. The Testastretta engine is more highly developed than ever before to maximise performance and minimise weight. Chassis components have obviously been selected for maximum competitiveness on the track, and special materials like magnesium, carbon fibre, and titanium abound to make the 749R unbeatably light and mean. The R’s engine has been specially developed for efficiency on the track. It develops 121 hp at 10,500 rpm and 8.6 kgm of torque at 8,250 rpm. By applying the knowledge gained on the racetrack, Ducati engineers have created our highest performance middleweight Superbike ever, with fully adjustable suspension, box-section aluminum alloy swingarm, and steering damper. The 749 is as at home on the road as it is on the track and is designed to offer an exciting, safe ride whatever the road conditions. A sleek riding position blends man and machine perfectly. At 108 hp, the Testastretta provides lightning acceleration out of corners and incredibly smooth power delivery without putting stress on the chassis set-up. Excellent torque (8.2 kgm at 8500 rpm), even at very low rpms, guarantees superb performance while making the motorcycle easy to handle in heavy traffic. The 749R is driven by a mighty twin-cylinder Testastretta engine created especially for racing. The 121 hp at 10,500 rpm has been achieved through full race tuning, and shortening the piston stroke while increasing the bore to 94 mm, up from the 90 mm of the 749 and 749s, thus enabling the engine to run at higher rpm. The slipper clutch is also racing derived and prevents the rear wheel from locking during track style downshifting and heavy engine deceleration. This Testastretta twin-cylinder engine has been created using the best materials: titanium valves, valve retaining collets and connecting rods, magnesium head covers and carbon fibre belt covers that feature a ventilation system to enhance belt cooling. The feather-weight crankshaft and high resistance aluminium alloy pistons complete the array of top notch components. One of the unique features of this model is the rear suspension linkage, with flat rising rate as used on competition Ducatis, that is suited to extreme track use and a single-seat set up. The lower rising rate produces linear performance throughout the stroke with less rigidity at high ranges, typical of high-speed cornering experienced on the track. The suspension works in partnership with a fully adjustable ?hlins rear shock absorber, with a shorter stroke than in the standard version (down from 71 to 56 mm) and with a heavier spring, designed especially for this motorcycle and its unique rear suspension. This model is exclusively available as a single-seater and is finished off with a numbered silver plate on the top yoke.
Features: 749R Just a glance is enough to recognise a no-holds-barred solo machine, designed expressly for use on the racetrack at the highest level of competition. The engine hails from the Testastretta series, while the solutions adopted for the chassis equipment are among the most EVOlved and extreme in the world of Superbikes, meeting with the approval of the most discerning racers. The 749R is built making ample use of prestigious materials such as magnesium and titanium to achieve the lowest possible overall weight. Style Original and totally aggressive, like all Ducati Superbikes, the 749R adds a numbered silver plaque on the top fork crown, making each machine absolutely unique. But apart from all the sheer guts it delivers on the racetrack, the most sports-oriented of the 749 machines is produced to ride on the street too, complete with mirrors with integral turn indicators. Apart from their elegant styling, these unique turn signals have the advantage of being quickly removable when the bike is being prepared for a race. Chassis In order to enable the best possible control of the performance available from the powerful Testastretta twin, each chassis element of the 749R was selected and tested with the aim of offering the maximum performance in competition conditions. That's why, alongside the elements shared by all bikes in the range, notably the trellis frame with adjustable steering head rake, there are several other details that have come straight from the race department. The box-section aluminium swingarm is structurally very similar to the unit installed on the 999s ridden by Toseland, Laconi and Lanzi or the Supersport raced by Nannelli, with clear benefits in terms of weight and stiffness. The swingarm is combined with a chain tension adjuster that uses sliders instead of cams, thereby avoiding the undesired effect of changing the height of the rear end of the machine and consequently the set-up when making adjustments to the final drive. The similarities of the rear suspension with the official race 999s continue with the shock linkage with flat progression, absolutely ideal to obtain the stiffness needed to obtain the necessary precision when riding at race speeds. The performance of the rear end is aided by the ?hlins shock, with fully adjustable hydraulic damping and equipped with a dedicated spring and more limited travel: 56 millimetres compared to the 71 millimetres of the other versions. Like the rear monoshock, also the fork is an upside-down configuration, with 43 mm sliders and, like all front suspensions installed by Ducati on its top-level machines, the sliders are TiN coated to ensure extremely low friction. Like the rear shock, the fork is fully adjustable and equipped with a special bottom lug for radial attachment of the brake callipers. These components were clearly designed for race applications, as were the brake system and wheels. The brakes feature 4.5 mm thick rotors and radial callipers with four pistons and the same number of pads, while the lightweight alloy wheels are Brembo/Marchesini units with five Y-spokes in forged and machined aluminium, offering a weight saving of 3.2 kg compared to a pair of conventional wheels, without sacrificing rigidity.
Powerplant The effects of a reduced stroke and increased bore, which allow the Testastretta twin to achieve higher revs, are clearly evident. On the standard equipment package the engine offers 121 HP at 10,500 rpm, with torque of 8.6 kgm at 8,250 rpm. These values can be boosted still further with the installation of the optional racing kit. Chassis: Frame: Tubular steel trellis
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2004年Ducati 749R
2013/7/29 8:25:00
