Question for jackshaft guys?

toker_ace · #1 11-22-2009, 09:19 AM

I am so on the fence about ordering a jackshaft from sickbikeparts.com . My questions are .... How much trouble is it to keep rear gears adjusted? Is it a constant tinkering to keep adjusted correctly. I have always had no luck with bicycle gears. Is it worth the price of two motors? LOL! Also, will it allow me to do some slow off roading? Hard to start? Will regular (wal mart) sprockets work or am I going to need to upgrade everything? See...... I got some questions. Thanks

Sydneysider · #2 11-22-2009, 09:38 AM

Hi TA, havent got a jackshaft kit yet but Im gonna get one for sure.. my friend has one on his bike and theyre well worth it I think. If you got a good quality brand set of rear gears like Shimano, you wouldnt need to adjust them that often like you would on cheap ones. As for the starting, your motor should be tuned to start pretty much right away otherwise youll be doing alot of pedaling as you kick that engine over.. Id say go for higher brand for sprockets and derailleur than the regular ones because there will be alot of shifting up and down.. cant wait till I get mine

Good luck with your decision..

Technocyclist · #3 11-22-2009, 09:45 AM

my 2 cents is that if you have the $$$, then go for it... I'm using an internal gear hub so the adjustment is very minimal. But you might have to modify the rear mount to keep the chain with a correct tension. The engine has a tendency to twist downwards to the right, so install that little angle aluminum bar, to minimize the engine movement, and chain slacking. You might need to have an extra angle aluminum bar, it can sometimes break. I have upgraded to a steel angle bar.

Starting the engine is not that difficult.

Your bottom bracket should be wider, about 127mm or longer.

It will certainly allow you to do off roading, but this depends on your sprocket size, and that your spokes, rims, brakes, and tires can handle the additional torque and power.

Sydneysider · #4 11-22-2009, 10:11 AM

Quote:

Originally Posted by Technocyclist

It will certainly allow you to do off roading, but this depends on your sprocket size, and that your spokes, rims, brakes, and tires can handle the additional torque and power.

I agree with Techno.. go for the heavy duty double walled rims with 12 guage spokes preferably stainless steel ones as Ive done.. theyre the best wheel ever!

Maxvision · #5 11-22-2009, 11:14 AM

I just put a shift kit on a bike for a guy that has a 3 speed Nexus hub. First gear is so low that he can take off from a dead stop without having to pedal first and he's a big guy. I drove it across a very thick matted grassy lawn and started in first without pedaling. Barely any strain on the clutch. Off roading wouldn't be a problem I'm sure.

I'm putting a shift kit on a 7 speed derailer right now. I'll be curious to see if all those extra gears are really worth it. The 3 speed hub seemed to cover all the needs that a shift kit allows.

MrLarkins · #6 11-22-2009, 02:39 PM

I got a kit this past summer. my chain keeps jumping off and I don't have the time currently to tinker with it. I can't seem to keep the setup from shifting angles when I ride it. I haven't ridden my bike for 5 months. I also lost a locking 'key' for a gear on one of the jackshafts and haven't figured out how to replace it. i have had moments where i wished i would have spent the money on other things...but once i get it running again, i'll probably change my mind again. i will say that sickbikeparts has awesome customer service. they've been very eager to help with all my problems...but i just haven't had the time i need lately to get it and keep it going.

one more note, i'm a small guy and i find it VERY hard to start it with the jackshaft

Pablo · #7 11-22-2009, 05:04 PM

Quote:

Originally Posted by toker_ace

I am so on the fence about ordering a jackshaft from sickbikeparts.com . My questions are .... How much trouble is it to keep rear gears adjusted? Is it a constant tinkering to keep adjusted correctly. I have always had no luck with bicycle gears. Is it worth the price of two motors? LOL! Also, will it allow me to do some slow off roading? Hard to start? Will regular (wal mart) sprockets work or am I going to need to upgrade everything? See...... I got some questions. Thanks

Once your rear gears are dialed in, then you should not have to adjust them any more than if you use your gears for pedal power only. If you have a 20 year old bike and you never have adjusted the derailleur, then probably it's time to adjust the derailleur. Pretty easy, really. No constant tinkering.

The shift kit isn't the price of 2 motors. Slow off roading? You will need low gear ratios, but I do it all the time.

If your engine is always hard to start, then it will remain hard to start. It's different, but if it's hard to start then something is not correct.

Not sure what a "regular (wal mart) sprocket" is. Don't use cheap, soft stuff. Some people do use some low cost bikes. But some low cost bikes even have terrible axles.

Hope this helps.

Pablo · #8 11-22-2009, 05:11 PM

Quote:

Originally Posted by MrLarkins

I got a kit this past summer. my chain keeps jumping off and I don't have the time currently to tinker with it. I can't seem to keep the setup from shifting angles when I ride it. I haven't ridden my bike for 5 months. I also lost a locking 'key' for a gear on one of the jackshafts and haven't figured out how to replace it. i have had moments where i wished i would have spent the money on other things...but once i get it running again, i'll probably change my mind again. i will say that sickbikeparts has awesome customer service. they've been very eager to help with all my problems...but i just haven't had the time i need lately to get it and keep it going.

one more note, i'm a small guy and i find it VERY hard to start it with the jackshaft

Sounds like something is not aligned correctly. Our instructions need to be followed explicitly on alignment issues. The key is simply 3/16" key material, available at most any hardware store. I can relate to the time issue. I wish I had time just to ride my bike.

As for starting, is your engine just difficult to start? Do you have a high compression head? Did you read our "how to" on starting?

toker_ace · #9 11-24-2009, 06:58 AM

hey sidneysider. Do you have a link to those rims?

Sydneysider · #10 11-24-2009, 08:36 AM

I think tyrslider still builds and sells these wheels, I may be wrong but see if he's around on the forum or drop him a message..