Tooth Chainring
Which gear would let me peddle my 10 speed bike faster?
Front chainring: 52 teeth and Rear chainring: 8
Or
Front chainring:39 and Rear chainring: 6
Please explain, also!
While it is common to have a 52/39 chainrings, rear cassettes or freewheels do not offer the smallest cog is 6 or 8 teeth.
Old 10 speeds were equipped with either a 13 or 14 tooth small cog.
Fastest gearing combination is largest in front, smallest in back.
Let’s assume your bike is equipped with a 14 tooth small cog.
It is all about ratios.
52 divided by 14 = 3.71
39 divided by 14 = 2.78
What does this mean?
When you turn the cranks one revolution, the rear wheel turns either 2.78 times or 3.71 times. 3.71 revolutions will move you farther than 2.78 revolutions. Hence when you are in the 52/14 combination, you bike will go faster.
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Ultegra FC-6603 30 Tooth 10-Speed Triple Chainring $30.91 |
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Ultegra FC-6603 39 Tooth 10-Speed Triple Chainring $37.91 |
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Ultegra FC-6600 39 Tooth 10-Speed Chainring $33.91 |
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Ultegra FC-6600 53 Tooth 10-Speed Chainring $65.91 |
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Ultegra FC-6650G 50 Tooth 10-Speed Compact Chainring $115.91 |
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