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Esjot Aluminum Rear Sprocket 99-05. These Esjot Alloy rear sprockets are less than 1/2 of the weight of the stock sprockets for better acceleration.
Availability: Please select from the options
SKU: ES51-13026
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Old price: $45.99 (USD)
$19.99 (USD)


Replace the heavy steel stock rear sprocket with an aluminum sprocket. For big-bore motors, the most popular combination is 13/43.

This chart shows the approximate top speed you will see on your RS50 at 12,000 rpm with a different final drive gearing choice than your stock 12:47 Gearing. The bold numbers on the left are your front sprocket choice.  The bold numbers across the top are your possible choices of the rear sprocket.  Not all possible gearing choices will work with the stock drive chain on the Aprilia RS50 and your top speed numbers may differ slightly from what we have calculated.  Speed numbers are in MPH and assuming 12,000rpm in top gear on a stock size rear tire.

 

 

 

 

 

 

 

 

 

 

 

41

42

43

44

45

46

47

48

49

11

65.0

63.4

62.0

60.6

59.2

57.9

56.7

55.5

54.4

12

70.9

69.2

67.6

66.1

64.6

63.2

61.9

60.6

59.3

13

76.8

75.0

73.2

71.6

70.0

68.5

67.0

65.6

64.3

14

82.7

80.8

78.9

77.1

75.4

73.7

72.2

70.7

69.2

15

88.6

86.5

84.5

82.6

80.8

79.0

77.3

75.7

74.2

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