nicklow241
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- Jul 24, 2003
- 9
- 0
I’m trying to create a table that will show different top speeds, given wheel size, and front and rear sprocket selection. I’m missing some key data. First would be the maximum revolutions the CDI allows the engine to revolve. Second is the meaning of the ratio number given for the gears. For instants, first gears having a ratio of 1.800. Is this the reduction of my crank rpm? So it would make the front sprocket turn .556 per revolution of the motor. If I’m doing my math properly this cant be right... saying that I have my bike in first gear revving at 10,000 rpm and my front tooth sprocket is 14 and rear is 50 and my rear wheel being 21 inches top to bottom. What would my Mph be? I would take .556 times 10,000, which is 5560. That would be the number of turns the front sprocket would be moving at that rpm. Then the ratio of 14/50, which would be 3.571. So for every 3.6 turns of the front it would turn my rear wheel once. Now I take 5560 / 3.571. To give me the number of revolutions the rear tire is making. So 1561.798 times the rear wheel diameter being near 80 inches. 124943.820 then convert that to feet so 10411.985 feet, and then divided by feet in a mile which is 5280 I think... that’s 1.972 miles per hour
That is not how slow I’m going in first gear. I think I would be doing at least 25 mph. Can someone help me with what I’m doing wrong. I don’t have a real good idea of what they are describing the ratio to be for the gears.
1st is 1.8
2nd is 1.47
3rd 1.210
4th 1.00
5th .869
any help is much appreciated.. Thanks
That is not how slow I’m going in first gear. I think I would be doing at least 25 mph. Can someone help me with what I’m doing wrong. I don’t have a real good idea of what they are describing the ratio to be for the gears.
1st is 1.8
2nd is 1.47
3rd 1.210
4th 1.00
5th .869
any help is much appreciated.. Thanks