Eliminating the driven sprocket

HI,

I am dying to try this out!....One thing tho....Will this kit fit on an aluminum frame with over sized tubes?

Thanks!

Andrew

PS - I suppose I could take a ball peen to dimple where the u bolt goes around the seat tube but is there enough clearance for the sprockets on the jack shaft?

__________________
Sprockets now available in 9 anodized colors!

http://www.myspace.com/kingssalesandservice
http://www.youtube.com/watch?v=-zyU8n41f2c

What size tube?

I suppose the rear mount bracket could be "adapted" in several creative ways to take a larger u-bolt.

__________________
http://oilslubesfilters.com/ AND NOW http://www.sickbikeparts.com/

I stumbles across this 15 page thread and read it all with excitement. Very interesting and a good idea. I have to throw this out there though: anyone looking to do this should have the rear derailleur hanger alignment checked at a bike shop or buy the park tool (Park DAG-1) to do it yourself. Being out a couple millimeters can make a big difference in shifting when putting the leg to it, could get ugly when adding in the torque of the motor. And make sure the low limit screw is adjusted so the derailleur doesn't meet the spokes and lunch the wheel. And don't just put on a new chain, have the chain checked for stretch with the propper checker (Park CC-2) or just put a whole new drivetrain on. New tolerance chain on old cogs means skipping and trouble. Not as bad on older mountain bikes with 6 or 7 cogs in the rear but an 8 or 9 should definitely be checked.
And did I read those last few posts right, you will be able to lean a bike over, clutch lever out, and use the crank arm like a kick starter?

Indeed. Bike needs to be tuned. If your dérailleur is marginal, have it adjusted. If your low limit is off, I think you would know it before installing a jackshaft, but yes check that and the high limit.

Yes. But with engine cold, it's a bit easier to do it with bike upright so you can get your legs into it.

__________________
http://oilslubesfilters.com/ AND NOW http://www.sickbikeparts.com/

Ok, I just meant leaned over enough so the rear wheel was barely off the ground.

Pablo, where can i see a larger pic of the bike in your avitar? Looks cool but I can't squint that much anymore

Here is the rendering of the photo that Pablo uses. It is what is theoretically possible with the jackshaft kit. I also included a picture of the bike I started with.

Attached Thumbnails

   

Hi,

Ok, I will try and explain this so it makes sense...

What I have at the moment is a GEBE belt drive 32cc 2S

What I want to do is get a hold of one of these jackshafts with one side configured with a GEBE gear so I can run a short belt to the jackshaft and then use the hub gears for a geared transmission - 7 speeds.

What I need to know is what is the dimension of the jackshaft and also can I set it up without using that idler chain as shown in the pictures - ie have the standard chain lengthened so it would go chainring/jackshaft/hub and back.

This would get me the best of both worlds and be the cheapest solution all in all...

comments and suggestions welcome

Jemma xx

The shaft itself is 5/8" - but the hassle in your set-up may be mounting the assembly. Also - I assume with what you describe your pedals would turn when under engine power [?]

__________________
http://oilslubesfilters.com/ AND NOW http://www.sickbikeparts.com/

I would need a freewheel crank of some description but my local bike shop reckons they dont exist!

Mine is a one piece schwinn cruiser type so would I need to replace that in order to use the jackshaft with the usual method of drive..?

Also why would there be problems fitting it - I assume its just two clamps to the frame?

On the upside - it looks like the belt would fit pretty much perfectly as regards a run from the gebe mount to the input side of the shaft

now I just need money.

The reason for this is to make the bike more flexible but still keep the reliability of the GEBE kit while adding gears - better hill climbing and possibly much better speed with the same power output.

Jemma xx