Hi all. I have a question about my banshee gear setup. Stock is 14/41 correct? Okay, I'm running with a 13 front sprocket, and rear is stock. I'm also running 22" tires, and stock is 20". So, I'm thinking I'm running it taller than stock by a little. Is this correct? How would I bring the gearing closer to trail riding gearing?

Thanks,

Jason

 

click here, then go to great info (link)
and you can go to a chart with ALL GEAR RATIOS!!!
http://pub20.ezboard.com/bhondatrx250r


hope this helps!!
remember that the info you are looking for is
under great info(link), after you click on url above

 

Ok, think of it this way...

14 / 41 * 20 * 3.14159 = 21.455" per cs sprocket rotation.

13 / 41 * 22 * 3.14159 = 21.915" per cs sprocket rotation.

That means that yes, you are running a little taller than stock.

 

Thank yall for the replies and help, but I didn't get what I wanted. I don't understand the numbers really, but am I still taller than stock gearing? Where precisely am I in laymen terms? Hehehe..not mechanical terms!

Later all,

Jason

 

Yes, you are running a little taller than stock. Ok, think of it this way. Let's say that at a given engine RPM with the stock configuration in 4th gear you would go 21.4 MPH. With the new configuration at the same engine RPM and in 4th gear you would now go 21.9 MPH. In short, your gearing is almost the same as before overall; it is slightly taller but I doubt a normal person could feel the difference.

 

So if I go up 2 teeth on the rear sprocket, where will that leave me? I want a little more low throttle rpm for the trails..but I don't want to lose a ton of top end either. If it can't beat a 400ex in top end...then what is it worth? Thanks for that informative reply...

Jason

 

Use the example below where:

13 is the number of countersprocket (front) teeth.

divided by

41 is the number of rear sprocket teeth. (put in a different number here to try larger rear sprocket).

multiplied by

22 which is the tire height in inches

multiplied by

3.14159 which is Pi (use this to figure circumference)

This will give you a relative value to work with.

13 / 41 * 22 * 3.14159 = 21.915" per cs sprocket rotation.

Give a man a fish and he eats for a day. Teach a man to ... Ah, you know.

 

That sound good for a stock banshee but what about a 370 long rod banshee? i have 9 cup Haulers 22x11x8 on 8x8 wheel. i have a 6 over swing arm, and i'm 250 lbs. what would you fun for gearing on this bike?

 

Thanks for the info...but I still don't understand how this relates to low end, less than half throttle, power characteristics.

Thanks,

Jason

 

Larger front sprocket = more top speed, less acceleration

Smaller front sprocket = more acceleration, less top speed

Larger rear sprocket = more accerleration, less top speed

Smaller rear sprocket = less acceleration, more top speed

Taller rear tire = more top speed, less acceleration

Shorter rear tire = more acceleration, less top speed

1" @ the rear tire roughly translates to 2 teeth on the rear sprocket.

2-3 teeth on the rear sprocket roughly translates to 1 tooth on the front sprocket

"Taller" ratios mean more top speed, less acceleration, smaller numerically.

"Shorter" ratios mean less top speed, more acceleration, larger numerically.

To obtain a gear ratio, divide the number of teeth on your rear sprocket by the number of teeth on your front. For example, 13 tooth front and 40 tooth rear.

40 divided by 13 = 3.07

If you had a 11 front and 37 rear that = 3.36

If you had 3.36 and you went to 3.07 that would be considered moving to a "taller" gear, because you're going to achieve a higher top speed with it.

If you had 3.07 and went to 3.36 that would be considered moving to a "shorter" gear, because you'll be acceleration more and achieving less top speed than before.

It can't be explained any simplar than that. Check out my printable gear ratio chart @ www.bombardierds650.com