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Thread: Close ratio?

  1. #1
    vfr is offline
    Baby Twin
    Join Date
    Jul 2009

    Close ratio?

    Hi i'm from Singapore and new here. Need to know whether the RSV4 comes with close ratio gear box? Thks.

  2. #2
    Evil Twin Mahoney's Avatar
    Join Date
    May 2009
    Does this help?

    APRILIA RSV4 FACTORY: Technical Specifications

    Engine type: Aprilia longitudinal 65° V-4 cylinder, 4-stroke, liquid cooling system, double overhead camshafts (DOHC), four valves per cylinder

    Bore and stroke: 78 x 52.3 mm

    Total engine capacity: 999.6 cc

    Compression ratio: 13:1

    Maximum power at crankshaft: 180 CV (132.4 kW) at 12,500 rpm

    Maximum torque at crankshaft: 115 Nm at 10,000 rpm

    Induction and fuel system: Airbox with front dynamic air intakes. Variable length intake ducts controlled via ECU.

    4 Weber-Marelli 48-mm throttle bodies with 8 injectors and latest generation Ride-by-Wire engine management.

    Choice of three different engine maps selecby the rider with bike in motion: Track | Sport | Road

    Ignition: Magneti Marelli digital electronic ignition system integrated in engine control system, with one spark plug per cylinder and “stick-coil”-type coils

    Exhaust system: 4 into 2 into 1 layout, single oxygen sensor, lateral single silencer with engine control unit-controlled butterfly valve and integrated trivalent catalytic converter (Euro 3)

    Lubrication: Wet sump lubrication system with oil radiator and two oil pumps (lubrication and cooling)

    Gearbox: 6-speed cassette type gearbox

    1st: 39/15 (2.6)
    2nd: 33/16 (2,063)
    3rd: 34/20 (1.7)
    4th: 32/22 (1,455)
    5th: 34/26 (1,308)
    6th: 33/27 (1,222)

    Clutch: Multi-disc oil-bath, with mechanical slipper system

    Primary drive: Straight cut gears and integrated flexible coupling, drive ratio: 73/44 (1,659)

    Secondary drive: Chain, Drive ratio: 40/16 (2,5)

    Chassis: Twin-spar adjustable aluminium frame, with castings and pressings. Envisaged adjustments:

    ·headstock position and rake
    ·engine height
    ·swingarm pin height
    ·Öhlins adjustable steering dumper

    Front suspension: Öhlins Racing upside-down fork, 43-mm stanchions (with Tin surface treatment). Low profile forged aluminium radial caliper mountings. Completely adjustable spring preload and hydraulic compression and rebound damping. Wheel travel: 120 mm

    Rear suspension: Twin sided aluminium swingarm; mixed low thickness and sheet casting technology.
    Öhlins Racing monoshock with piggyback with completely adjus: spring preload, wheelbase and hydraulic compression and rebound damping. APS progressive linkages. Wheel travel: 130 mm

    Front: Dual 320-mm diameter floating stainless steel disc with lightweight stainless steel rotor and aluminium flange with 6 pins. Brembo monobloc radial callipers with 4 34-mm opposite. Sintered pads. Radial pump and metal braided brake hose

    Rear: 220-mm diameter disc; Brembo floating caliper with two 32-mm isolated pistons. Sintered pads. Pump with integrated tank and metal braided hose

    Rims:Aprilia forged aluminium alloy rims, completely machined, 5 split spokes.

    Rear: 6″X17″

    Fuel Tank: 17 litres (4-litre reserve included)

    Dimensions (default settings):

    Max. length: 2040 mm
    Max. width: 735 mm (at the handlebar)
    Max. height: 1120 mm
    Min. height from the ground: 130 mm
    Saddle height: 845 mm
    Center to center distance: 1420 mm
    Trail: 105 mm
    Steering angle: 24.5°
    Curb weight (dry): 179 kg

  3. #3
    One Liter Duc Eater millekid's Avatar
    Join Date
    Jul 2007

  4. #4
    vfr is offline
    Baby Twin
    Join Date
    Jul 2009
    But there's no indication whether it is close ratio or not. Perhaps someone can interprete that gear readings. Thks.

  5. #5
    as its basically a race bike why ask...just change sprockets if your that bothered

  6. #6
    One Liter Duc Eater Deacs's Avatar
    Join Date
    Jun 2009
    Sunny Oxfordshire
    my guess would be yes. google brought up this: V-4 engine is ultra-compact, which allows the entire bike to be 250cc GP-sized. Six-speed gearbox is cassette-type, expediting internal gear-ratio changes for racing. Take a look at the last of the facory's g'box ratio's (factory had close-ratio g'box) if they're similar (its a twin so may be slightly different) then you have your answer
    Last edited by Deacs; July 22nd, 2009 at 03:39 AM.

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