Gear ratio

[thisismyusername]

Ok so my gear ratio is going to be a 12 tooth clutch, 42 tooth sprocket, and 10" wheel (engine is the predator 212 and its going to be single wheel drive). The speed calculator on here said its top speed would be around 31mph. I didn't think it would burn up the clutch but my friend told me it would burn it up fast. So before i assemble it tomorrow it would be nice not to burn up the brand new clutch if possible lol.

 

[firemanjim]

You are wrong, sorry to say..... 12 and 42 is like 3.5:1 (quick math,late hour)
You are gonna burn up the clutch.....
Why are you using 10" tall tires? That's tiny...

 

[thisismyusername]

You are wrong, sorry to say..... 12 and 42 is like 3.5:1 (quick math,late hour)
You are gonna burn up the clutch.....
Why are you using 10" tall tires? That's tiny...

Its on a trike build i'm doing, would you recommend a bigger sprocket or different tires, because i dont really want bigger tires for this small trike build? What ratio's will burn up the clutch?

 

[chancer]

3.5:1 even with 10" will not work. I imagine you want the small sprocket due to the small tires and it is a drift trike. Check out this thread. He tried some different sprockets and then a jackshaft. http://www.diygokarts.com/vb/showthread.php?t=29207

 

[thisismyusername]

3.5:1 even with 10" will not work. I imagine you want the small sprocket due to the small tires and it is a drift trike. Check out this thread. He tried some different sprockets and then a jackshaft. http://www.diygokarts.com/vb/showthread.php?t=29207

Ahh i really don't want to do a jackshaft, and its going to have regular tires so its not for drifting, thats why i don't want it to go too fast.

 

[firemanjim]

3.5:1 even with 10" will not work. I imagine you want the small sprocket due to the small tires and it is a drift trike. Check out this thread. He tried some different sprockets and then a jackshaft. http://www.diygokarts.com/vb/showthread.php?t=29207

Ahh i really don't want to do a jackshaft.

Argggggg sometimes we just have to bite the bullet, and do it right...... A jack shaft is definitely gonna be needed in order for the clutch to last . You're gonna want at least a 5.2--5.4:1 ratio, and with 10# tall tires, you should be OK.

 

[chancer]

Yeah I did not want to do a jackshaft on my recent "Razor Buggy" build either. But it was not really that hard. Just a lot of pieces. What if you got a 10 or 11 tooth clutch. and 54 or 60 tooth axle gear. You could get the 5.?:1 Jim mentioned.

 

[thisismyusername]

Argggggg sometimes we just have to bite the bullet, and do it right...... A jack shaft is definitely gonna be needed in order for the clutch to last . You're gonna want at least a 5.2--5.4:1 ratio, and with 10# tall tires, you should be OK.

Well i was thinking of putting a 72 tooth sprocket on. I mean i'm not too sure but with the jackshaft i would probably need to spend at least $100 or more into this build. I was thinking of putting this sprocket on the 10" wheel. http://www.amazon.com/Browning-Mini...pebp=1434346789924&perid=1C491C7D51B24CDE8BCB

When it says its an 8" pitch, do you think the diameter is 8" or do you think it is too big for 10" tires?

 

[thisismyusername]

Yeah I did not want to do a jackshaft on my recent "Razor Buggy" build either. But it was not really that hard. Just a lot of pieces. What if you got a 10 or 11 tooth clutch. and 54 or 60 tooth axle gear. You could get the 5.?:1 Jim mentioned.

Yea i already have the 12 tooth clutch though. And i don't really know much about gear ratio's and i have no knowledge on jack shafts. So im kind of clueless here lol.

 

[firemanjim]

He's running #35 chain I bet, so if a 60-66 tooth axle sprocket is in your budget, buy one. A 60 tooth is only 7.375" in diameter. That's a 5:1 ratio, better, not best.... A 66 is like 8" in diameter, so it would fit too, and be better for you at a 5.6:1..... If you don't want to go fast, don't hammer down on the throttle......

 

[firemanjim]

If you are concerned with smacking the chain on something , then install a chain protector on the hub. I'm assuming that you are only gonna be riding on asphalt ,street ? If you intend to go in the grass and dirt, you will need a smaller sprocket for clearance, then a jack shaft becomes a necessity.....

 

[thisismyusername]

If you are concerned with smacking the chain on something , then install a chain protector on the hub. I'm assuming that you are only gonna be riding on asphalt ,street ? If you intend to go in the grass and dirt, you will need a smaller sprocket for clearance, then a jack shaft becomes a necessity.....

Yea its mostly for on asphalt. Im thinking about picking up some 13" tires. Then ordering a 60 or 72 tooth sprocket.

72 tooth would be a 6:5.5:1 with 13" tires.
Also thinking about leaving the 10" tires and using that sprocket to bolt to the tires. That ratio would be a 6:6:1 with 72 tooth sprocket.
I think the holes in that line up to the holes in the 10" tires i have, just a matter of how big the sprocket's diameter is. I want to keep it a nice and simple 1wd trike. or would it be better to use a 60 tooth? A 60 tooth sprocket, 12 tooth clutch and 10 inch wheels. That would be best i think, that wouldn't hurt the clutch right?


Neither of those would be bad for the clutch would they? It would just have a lot of torque? Im kind of leaning towards the 60 tooth sprocket, would that be fine for the clutch?