Ok I Am Stumped

doubledice · #1 12-02-2009, 09:37 PM

Hey guys im planing on building a 1920s indian boardtrack racer and im trying to get everything planned out before i hit the shop but i hit a road block! I want to keep this project as best looking as i can and I want to do the same chain set up but i dont know how. Here is a pic of the chain set up. any ideas on how they did that without making the pedals spin to???

tyrslider · #2 12-02-2009, 10:31 PM

I think much like the sprag on sbp's shifter this bike is using a one way bearing where the motor is rolling the bearing but the pedals engage the clutch mechanism of the bearing. This is one type McMaster-Carr

doubledice · #3 12-03-2009, 12:10 AM

You know that's so crazy it just, might, work! Thanks bud i didn't know that even existed! Its right in my price range to

tyrslider · #4 12-03-2009, 12:23 AM

right on i just discovered'em myself good luck!

doubledice · #5 12-03-2009, 01:53 AM

I like that bearing allot but do they have all steel ones so i can weld on it?

dmar836 · #6 12-03-2009, 11:50 AM

If you welded on the bearing it would distort and ruin it. It would grind and turn the pedals afterall.

BTW, the assembly you are referring to was called a countershaft.

Dave
KC

dmar836 · #7 12-03-2009, 11:59 AM

I'll let you think a while before I suggest how it can be done.

doubledice · #8 12-03-2009, 09:06 PM

Aw come on haha alright fine.

What if i do a sliding gear thats connected to the pedal crank and when it slides into a groove in the sprocket it moves the sprockets to the engine and tire. If you get what im saying? i guess it would be like a homemade clutch

dmar836 · #9 12-03-2009, 11:05 PM

I would suggest you start with this or a similar freewheel. You will still need a threaded countershaft but this will allow a crank to freewheel once the motor is running.

I think you need something with pawls around the circumference rather than something so close to the spindle like the one-way needle bearings. The larger the diameter the better.
BTW, I ruined a HD freewheel's bearing surface just by distempering the teeth enough to cut them. The heat needed will warp the part. These are already set up for mounting.

Darn it. I'm giving away all my ideas for future projects!

Dave
KC

dmar836 · #10 12-03-2009, 11:06 PM

BTW, found at Sick Bike Parts LLC.