download: OpenOffice.org Downloads Some where in this sight I believe. I use linux Ubuntu 904 right now. So I don't know how or where for windows really. Try this page! download: Instructions for Downloading and Installing OpenOffice.org 3.0
Motorized Bicycle Gear Calculator
- Thread starter Dave31
- Start date
Thanks GH! I am going to try and trash infopath and see if it will ask me what to open with.
Can't we all just get along!? LOL, talking to my programs
Can't we all just get along!? LOL, talking to my programs
Here's another zip with two files inside. One for Open Office and one for MS Excel. I hope it'll be easier for everybody 
Last edited:
no thats not right
firstly
is the 11 tooth pully or sprocket mounted on the engine crankshaft or a gearbox?
if its a chinese 2 stroke motorized kit it uses a geabox so you will have to remove the gearbox cover and count all the teeth involved
i believe its somthing like 20 teeth on the crankshaft
then 90 on the clutch
firstly
is the 11 tooth pully or sprocket mounted on the engine crankshaft or a gearbox?
if its a chinese 2 stroke motorized kit it uses a geabox so you will have to remove the gearbox cover and count all the teeth involved
i believe its somthing like 20 teeth on the crankshaft
then 90 on the clutch
Ahhh! What am I doing wrong? I am trying to calculate final drive for a mid-drive (jackshaft) setup, to select the best gears on the clutch, jackshaft and rear wheel.
The problem is (and I obviously must be doing some wrong) that for instance, if I change the gears on the jackshaft around (i.e the input is a 13 tooth, output is a 18 tooth; then swap them round to a 18 input, 13 output) the resultant speed remains the same! Its like I can't affect the final drive ratio at all?? WTH?
The problem is (and I obviously must be doing some wrong) that for instance, if I change the gears on the jackshaft around (i.e the input is a 13 tooth, output is a 18 tooth; then swap them round to a 18 input, 13 output) the resultant speed remains the same! Its like I can't affect the final drive ratio at all?? WTH?
Right, this makes sense. I think my problem is how I am inputting the jackshaft into the calculator.
Trying to figure out what I need to get, or more specifically, if some components I have sourced will work. From the HF 79cc Utility Bike thread, I said I found a Hilliard centrifugal clutch at Northern that has 12 teeth; also they have a jackshaft kit that has a 13 tooth and 18 tooth cogs in it. So I was trying to input those, along with an assumed rear wheel gear, to see if I was in the ballpark. I put in the 13 and 18 tooth gears in one way, and then when I flip them, the output on the calculator remains unchanged, which makes no sense to me? It's gotta be operator error, I just can't figure out what.
Thats right the utility bike. I didn't put two and tow together. Sorry, most likely your first reduction will have to be at least 2/1. So a minimum of a 24 tooth sprock will be required (24/12=2/1). That sprocket would be attached to your Centi. clutch via chain. on the other end of you jack shaft you would want something around a 9-12 tooth sprocket. That would be run to your rear axle by chain.
You want to multiply your first reduction by your second reduction to get the total reduction.
So if your second reduction went from a 10 tooth to a 72 tooth (72/10 or 7.2/1) and your first reduction went from a 12 to 24 (24/12 or 2/1) your final reduction would be 7.2 x 2 which equals 14.4 or 14.4/1
Clear as mud huh???
You want to multiply your first reduction by your second reduction to get the total reduction.
So if your second reduction went from a 10 tooth to a 72 tooth (72/10 or 7.2/1) and your first reduction went from a 12 to 24 (24/12 or 2/1) your final reduction would be 7.2 x 2 which equals 14.4 or 14.4/1
Clear as mud huh???
Last edited:
Thanks, Felton. So would it be easier for me to use the jackshaft to get to the right side and then drive that thru a freewheeling crankset, finally back to the rear wheel (ala sickbikes shiftkit)??? I can see how I might have issues getting large sprockets for a 5/8" jackshaft.
Villiers Information at www.villiers.info
And these lads say that isn't so. More motorcycle motor of a direction but maybe something for us.
Steve.
And these lads say that isn't so. More motorcycle motor of a direction but maybe something for us.
Steve.
Cobra found this. Looks pretty cool.
Not gear related but thought it would go well with the other calcs
Hi, i cant get the links to work. Here is a pic of what i have planned. im open to criticism.
Attachments
asuming jackshft has two equal sprockets
your final ratio will be 10 tooth / 54 tooth
=5.4 to one ratio
which is too tall for a 26" wheel
would be ok if your rear wheel was 20"
reduce the number of teeth on jackshaft sproket that connects to rear wheel
your final ratio will be 10 tooth / 54 tooth
=5.4 to one ratio
which is too tall for a 26" wheel
would be ok if your rear wheel was 20"
reduce the number of teeth on jackshaft sproket that connects to rear wheel