So, I currently have a 32 tooth rear sprocket for my brand new 80cc motor on my beach cruiser bike. I’m a 220lb guy, making my little engine that could lol, struggle quite a bit goin up steeper or longer hills. I’m thinking of putting a sprocket with more teeth on it to solve my problem. Any thoughts or suggestions?? I’m new to this hobby, this being my first project. So any input from the more experienced peeps would be more than welcomed
Rear Sprockets
- Thread starter Gerald4ya
- Start date
I fluctuate from 217 pounds to 220 pounds myself...My bike a few years ago originally had a Zeda 80 cc motor on it and I was running it with a 36 tooth sprocket on my bike which by the way is already 80 to 90 pounds all by itself...lol...lol.
I only had to pedal assist to start it or take off from a dead stop so as to be kind to the clutch, otherwise it had no problem dragging around my lard arse...lol.
This is a pic of me with my bike when I still had the Zeda 80 motor and 36 tooth sprocket before I changed it the the Phantom 85 motor, (also manufactured by Zeda but humongously more powerful...lol.)
Sidewinder Jerry
Well-Known Member
What size tires are you using and what is your max level ground speed?
Next time stand up, I can't see you behind the bike LOL...
Depth perception my friend...That porch has an 8 foot depth, I'm standing against the wall, the bike is standing on the end of the porch...lol.
But yeah, I'm still kinda short at only 5 '6" ...lol.
Ps...I used to look like a muscular little bull dog years ago...lol...Now I just look like a mangy mutt...lol...lol.
Gordy
Well-Known Member
A 40 or more tooth will probably suite you better
Max speed right now on level ground is around 23-25mph. I have 26” x 2.125 tires. It feels like it wants to go faster sometimes, but where the motor isn’t really broken in quite yet, I try not to push it too hard lol
Sidewinder Jerry
Well-Known Member
So if at full throttle on 26" tires you're doing 25 mph on level ground using a 32t that means your engine is turning 4241 rpm. If you were using a 44t your engine would be turning 5831 rpm. Around 6000 rpm is normal for a quality engine which hasn't been fully broken in or the discount engines which has been broken in.
I have a shifter bike. The max hp rpm is 7000. If I'm doing max hp rpm at full throttle and shift to a higher gear, I won't go any faster. The increased work load will cause the engine rpm to drop and will probably slow me down some because I'll be below max hp.
So what does all this mean? If your speed hasn't increased any after the break-in; unless you do engine performance mods, that 32t is too high of a gear for your engine.
