srdavo
Well-Known Member
A jackshaft is also an alternative to a gearbox.
Sprockets what is the best ratio for a 2 sprocket bike
- Thread starter bcoltsmith1
- Start date
bcoltsmith1
New Member
yes thats a good way, the only thing is i dont want to risk breaking my spokes. I have an old partner 500 50cc chainsaw engine its yellow
any help with finding out more about this motor would be greatly appreciated
any help with finding out more about this motor would be greatly appreciatedbcoltsmith1
New Member
treewk
wouldn't i go through alot of belts doing it like that?
wouldn't i go through alot of belts doing it like that?
TREEWK
Member
bcoltsmith, I SENT YOU A PM. RON
bcoltsmith1
New Member
i received it
TREEWK
Member
The Secondary Sprockets That You Pm To Me Are 2:1 Ratio (30 To 60). Your Primarey (10 To 60) Is 6:1 As You Stated. You Multiply One Ratio By The Other . 6:1 X 2:1 = 12:1 Final Ratio. I Think Secondary (10 To 30 ) 3:1 X 6:1 Would Give You The Normal 18:1 Ratio. Use Whatever Tooth Counts You Can Find, Try To Be Close To 18:1.
bcoltsmith1
New Member
lol i see what you mean, i found a gear ratio calculator somewhere on the forum, so i have been playing with the numbers that would be easiest for me. i want the most speed i can get from the motor. and from 18:1 ratio at 9000 (give or take a 1000) and 20" tires i will get 29.7 miles per hour. so i was thinking of using davids from davidsfarm ratio 14:1 (for my weight 220lbs) and the closest i can get with his ratio is 13.64:1 and that sprockets would be easier for me to get. im still uncertain cuz david has ALOT of experience with engines, but so does alot of people on this forum.
i know im being a little difficult but i want to do it right the first time
TREEWK
Member
Yeah, I Was Not Taking Into Account Your 20 Wheels. So It Looks Like You Are Real Close. Sorry For Steering You A Bit Wrong. I Am So Used To 26" Wheels. Good Luck With The Build. Keep Us Posted . Ron
bcoltsmith1
New Member
oh no thats fine, i should have mentioned the tire size earlier. and would the center of a bicycle work as a jackshaft?
