what would happen...

[Mobius]

If I welded a sprocket to the driveshaft and connected it to the sprockets on the back tire via a small chain???

would this be an effective way to power the bike???

[Dave31]

That's what I am doing...but I am not going to weld the sprocket to the shaft. I'm having trouble finding the right sprocket to fit the shaft with the gearing that I'm looking for.

So until I find the right sprocket I'm using a old one off a old MTB that I have to get thing's ready for when I do find the right sprocket.

I welded the sprocket to the sprocket of the one that does fit the motor...keep in mind this is just for mock-up

Hmmm....I'm having trouble uploading my pics. Check this thread later on for pics...http://motorbicycling.com/f36/my-diy-project-2444.html

[Mobius]

what kind of gearing would you suggest???

and you wouldnt weld it you would just fasten it up with bolts???

I guess this is an interesting idea... In that case couldnt you just take some kind of metal disc and bolt the correct gear to it and go from there?

You could almost change teh angle of your derailleur so that it could change what gear the motor was engaging.

You might be on to something

[Dave31]

My photobucket is not working so here is some attachment files

[Mobius]

is that a bicycle sprocket or something bigger??? how did you attach it?

I was thinking jsut to add a single to the top and maybe realign the derailleur.

[Jemma Hawtrey]

Do you mean a shaft with the cassette on it and a single sprocket at the back?

That would actually make more sense than the usual way because the change is nearer the motor and torque source and you'd get less trouble from the chain such as it jumping and such.

Im interested in seeing what you come up with on this

jemma xx

[jasonh]

hmm, or even a cassette on both ends and two derailers! That would be an interesting one. Get a whole boatload of gears that way, lol. Ok yeah, I'm a little nuts

[Dave31]

The motor will have a single sprocket...I will be using the existing cassette sprocket already on the wheel.

I'm just using this cassette sprocket to mock-up. The gearing will not work...No way will I be able to take off from a stop with this gearing. The motor has a gear reduction with a centrifugal clutch.

The small sprocket is the original that came with the motor..I welded it to the cassette sprocket.

[Mobius]

Originally Posted by jemma

Do you mean a shaft with the cassette on it and a single sprocket at the back?

That would actually make more sense than the usual way because the change is nearer the motor and torque source and you'd get less trouble from the chain such as it jumping and such.

Im interested in seeing what you come up with on this

jemma xx

I was thinking of mounting a single sprocket to the driveshaft and running the chain down to the mainsprockets on the rear axle and making the derailleur work for it instead

[Dave31]

Originally Posted by Mobius

I was thinking of mounting a single sprocket to the driveshaft and running the chain down to the mainsprockets on the rear axle and making the derailleur work for it instead

That's the plan