Where to buy sprockets?

[BL_RV0]

I'm building a weedwacker powered pocket bike at the moment, and need some help as to where I can buy sprockets for it. The engine's shaft is on the left side of the bike and the rear sprocket is on the right. Because it is like this, I am going to use a jackshaft setup. Overall, I need a 10:1 reduction ratio to attain 30mph. I've tried mcmaster, SDP-SI, and boston gear to no avail. If anyone has an idea where I can get these, that is much appreciated. I'd prefer polycarbonate or acetal to keep the costs down. I've also considered a beltdrive setup, but decided against it because it would cost upwards of $200 for the gears and belts!

[johnrobholmes]

Have you tried mfgsupply.com?

[eovnu87435ds]

McMastercarr.com has EVERYTHING

try finding a piston return spring there, it may help you and your pocketbike project

[Overdriven]

I know you probably can't move the sprocket to the other side of the wheel, but can you flip the wheel so the sproket is on the correct side. IMO if you're going to be fabbing brackets, fabbing a new brake bracket on the other side would be a simpler/cleaner setup. That's assming you can get your gearing without a jackshaft. A jackshaft also complicates chain tensioning, since you now have 2 to worry about. And your more likely to run out of motor/axle adjustment and be in between links on the chain (too short, adding 1=too long), so do mockup with complete chains in place. Ebay used to have alot of sprockets when pocket bikes were popular.

[lincpimp]

Ben linked me to some sort of site that had all kinds of sprockets and chains in various sizes. Pm him.

[eovnu87435ds]

me and ben use mostly the same sources... mcmastercarr.com and robotmarketplace.com will have most common sizes... besides, ben's parents jacked the computer right out of his room, so you may not find him online for a bit...

If you are modifying a regular bicycle wheel, be aware that they do not use standard 25 chain... If you cant budge on the gear ratio, anybody who runs a cnc machine can cut you one...

[BL_RV0]

Thanks guys, but I looked thru a random box of mountain bike parts I found today and found every sprocket I need except one, which I can order from sdp-si. It'll be great to know the aforementioned sites though.