Gearing - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 29 (permalink) Old 04-22-2014, 01:57 PM Thread Starter
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Gearing

Right my bike has 16/45 gearing that the previous owner put on. Thinking about switching the gearing to 15/42. Would it be much of a difference? Or would it be pretty similar to what's on the bike now?

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post #2 of 29 (permalink) Old 04-22-2014, 02:08 PM
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45 / 16 = 2.8125

42 / 15 = 2.8

So theoretically your front sprocket will turn by 0.0125 turns less for each rear sprocket's full rotation. That means it'll be a bit "longer" geared than with the 16/45.
Probably a couple of mph more on the same rpms

I don't think that you'll notice much on the throttle while riding it though


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post #3 of 29 (permalink) Old 04-22-2014, 02:31 PM Thread Starter
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Cool, I hada feeling it would be pretty close.
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post #4 of 29 (permalink) Old 04-22-2014, 06:51 PM
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Sprockets

How many teeth are the stock sprockets?
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post #5 of 29 (permalink) Old 04-22-2014, 07:18 PM
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How many teeth are the stock sprockets?

16/40 are stock. If you look at your rear, it is normally stamped on the sprocket.

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post #6 of 29 (permalink) Old 04-22-2014, 07:28 PM
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Thanks. Thinking of going to 16/42 to "brighten" it up.
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post #7 of 29 (permalink) Old 04-22-2014, 07:42 PM Thread Starter
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Thanks. Thinking of going to 16/42 to "brighten" it up.
Ditto!!!! I think I'm going to give that a shot too after doing a little asking around.
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post #8 of 29 (permalink) Old 04-23-2014, 06:42 AM
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Originally Posted by extrapolator View Post
You'd achieve a tad more power at the rear wheel, since a 15T sprocket is easier for your motor to turn than a 16T, but I'm not sure you'd notice it. I'm not smart enough to convert it to torque figures.
Only variable IS torque.
Power will stay the same.
Can't work out power without a torque figure to start with.
Power = torque X rpm

Smaller drive sprocket = more torque + less rpm = same power
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post #9 of 29 (permalink) Old 04-23-2014, 09:49 AM
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Only variable IS torque.
Power will stay the same.
Can't work out power without a torque figure to start with.
Power = torque X rpm

Smaller drive sprocket = more torque + less rpm = same power
Right. I should've said 'torque' ... and as the old saying goes, "Horsepower sells cars; torque wins races."

Do you think 16/45 (2.8125) gearing and 15/42 (2.8) gearing would accelerate at essentially the same rate? (i.e. no benefit from the fact that the front sprocket is 15T vs 16T?)
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post #10 of 29 (permalink) Old 04-23-2014, 10:23 AM Thread Starter
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Do you think 16/45 (2.8125) gearing and 15/42 (2.8) gearing would accelerate at essentially the same rate? (i.e. no benefit from the fact that the front sprocket is 15T vs 16T?)
This is pretty much the same thing I was wondering, and why I asked the question.
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