Aprilia Gearing - Written March ‘07

Summary: Various gearing for Aprilia V990 models with ratio and RPM comparisons.

The V990 engine that has powered the RSV, RSVR, RST, SL and ETV models is fitted with one primary drive ratio and two alternate gearbox sets, being wide and close.  Close ratio boxes have been fitted to all the RSVR and SP models (afaik) and to the Tuono from ’06 models onward (when it was fitted with the ’04 spec RSVR engine).  So unlike the Ducati gearing report, this one is quite short and easy to follow.

Primary drive ratio (the gear on the end of the crank and the gear attached to the back of the clutch basket):  31/60 – 1.94:1

The two gearbox sets are as follows:

Gear

Wide Ratio – Spread 2.93

Close Ratio – Spread 2.56

Input

Output

Ratio

% Gap

Input

Output

Ratio

% Gap

1

14

35

2.50

 

15

34

2.27

 

2

16

28

1.75

30

19

31

1.63

28

3

19

26

1.37

22

20

26

1.30

20

4

22

24

1.09

20

22

24

1.09

16

5

23

22

0.96

12

25

24

0.96

12

6

27

23

0.85

11

26

23

0.88

8

Notes:

  • Spread refers to the variation from first to sixth – bigger number means wider ratio gearbox.
  • Input is the number of teeth on the input shaft gear.
  • Output is the number of teeth on the output shaft gear.
  • Ratio is the numerical ratio the gears give.
  • % Gap is the change in ratio form the gear lower than it – ie, first to second on the wide ratio box gives a 30% change in gearing and therefore RPM for the same road speed.

To give an idea of how this works with various sprocket combinations, the following table shows approximate RPM at 120km/h with both gearbox sets.  A tyre circumference of 1.95m has been used for these calculations, which is about right for most tyres in the 160 to 190 size range.  Realistically this assumption is probably about as accurate as your speedo or tacho, but as an indication of RPM changes with gearing changes, it’s accurate.  The two right hand columns also show RPM at 20km/h in first gear.  This is simply to give you an idea of how the wide and close ratio boxes affect overall gear spread.  I’ve used 15 to 17 tooth front and 40 to 47 tooth rear sprockets for this table.  As yet I’m not sure if that covers the range most Aprilia owners would use, so if not please let me know.

FRONT

REAR

RATIO

RPM @ 120 KM/H

RPM @ 20 KM/H

IN 6TH GEAR

IN 1ST GEAR

WIDE

CLOSE

WIDE

CLOSE

17

40

2.35

3979

4132

1946

1765

17

41

2.41

4078

4235

1995

1809

17

42

2.47

4178

4339

2043

1853

16

40

2.50

4228

4390

2068

1875

17

43

2.53

4277

4442

2092

1897

16

41

2.56

4333

4500

2120

1922

17

44

2.59

4377

4545

2141

1941

16

42

2.63

4439

4610

2171

1969

17

45

2.65

4476

4648

2189

1985

15

40

2.67

4509

4683

2206

2000

16

43

2.69

4545

4719

2223

2015

17

46

2.71

4576

4752

2238

2029

15

41

2.73

4622

4800

2261

2050

16

44

2.75

4650

4829

2275

2062

17

47

2.76

4675

4855

2287

2073

15

42

2.80

4735

4917

2316

2100

16

45

2.81

4756

4939

2326

2109

15

43

2.87

4848

5034

2371

2150

16

46

2.88

4862

5049

2378

2156

15

44

2.93

4960

5151

2426

2200

16

47

2.94

4967

5158

2430

2203

15

45

3.00

5073

5268

2481

2250

15

46

3.07

5186

5385

2537

2300

15

47

3.13

5299

5502

2592

2350

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