Shifting???

Bikewithamotor · Nov 20, 2009

Hi, I have a stock 44t rear sprocket which maxes out on the road pretty quick. So...I mounted a 24t right next to it. The engine doesnt have enough power to start going in this gear, so I was wodering...

Does anyone know of a good way of shifting gears? (Please not the 250 dollar shift kit!)

Homemade designs are sweet if you have one!!!

Thanks

Ghost0 · Nov 20, 2009

The standard kit is only $180, but I hear what you are saying. My initial attempt at a shift kit was to use a derailleur on the left side to try to make a three speed. Didn't work out very well because when you try and bump start the engine the derailleur would unwind, loosen your chain and it would fall off. I am sure others will have some ideas for you though.

Creative Engineering · Nov 20, 2009

Bikewithamotor said:
Hi, I have a stock 44t rear sprocket which maxes out on the road pretty quick. So...I mounted a 24t right next to it. The engine doesnt have enough power to start going in this gear, so I was wodering...

Does anyone know of a good way of shifting gears? (Please not the 250 dollar shift kit!)

Homemade designs are sweet if you have one!!!

Thanks

I would like to see your set-up with the 24T mounted right next to the 44T. Do you have pics?

Jim

Riding Rich · Nov 20, 2009

Search google for "Jackshaft / Shiftkit / Freewheel"

I have a thread out there that might give you some ideas.

It's not completed totally.

Someday i'll finish it.

I don't know about cheaper though.

NEAT TIMES · Nov 20, 2009

A Sbp Shift Kit Or A Cvt Belt Box Is The Best Thing You Can Do For Any Motor. I Weight 0ver 300 And My Titan 49cc With Shifter (sbp Shifter Pieces) Amaze`s Me Every Time I Ride. Motor Developes Awsum Torque With Out A Lot Of Rpm`s. If You Could Test Ride A Shifter Bike, That Would Be It!! A Shifter Build Is Better Than Any Mods. Ron

Pablo · Nov 20, 2009

You could wait for our dead of winter sale! zpt

BarelyAWake · Nov 21, 2009

Pablo said:
You could wait for our dead of winter sale!

orly?

oops Pablo - you may have just postponed a purchase lol

Bikewithamotor - not to dissuade any DIYers, but after a buncha research I've found the SBP's shift kit isn't as expensive as it seems - when you add up all the costs of the various parts (the freewheel sprocket on the crank being one of the biggest) and all the effort in R&D... it's actually quite reasonable and you know it'll perform.

Pablo · Nov 21, 2009

Late Dec-Jan time frame...

Riding Rich · Nov 21, 2009

Pablo

That's great news.
I'm on a limited budget till after christmas.

Bikeguy Joe · Nov 21, 2009

I don't think the stock engine will pull a 24T on a 26" bike anyway.

Maxvision · Nov 21, 2009

I'd save my pennies and go with SBP's shift kit. Just put one on a bike for a customer and it's sweet as can be. With his 3 speed nexus hub he can start in first gear without pedaling and in third, with a good flat road and a back wind he can hit close to 50 mph.

Be safe when you ride at those speeds. All we're going to need is a few dumbasses killing themselves (or someone else) then bingo, new laws will no doubt be passed.

xlite · Nov 21, 2009

Bikeguy Joe said:
I don't think the stock engine will pull a 24T on a 26" bike anyway.

Absolutley true. Even a 28t is close to worthless, even on a slant with expansion pipe. If 24t did work the difference between 24 and 44 is too much for any deraileur anyway.

Russell · Nov 21, 2009

I'm not sure how the math works. It seems that any two sprockets next to each other on a hub, must be sized so that they match the pitch of the chain for proper shifting.

I have no idea how great the difference in tooth count in two ajoining sprockets, could be.
If I were able to figure all that out I would fab a two or three max cluster.

NEAT TIMES · Nov 21, 2009

When I Looked Carefully At The 7 Speed Cassette Off A Regular Pedal Shifter Bike, There Is Much More To It Than I First Thought. There Are Ramps To Move The Chain Up And Other Mods. It Is Not A Simple System. Ron

Bikewithamotor · Nov 25, 2009

Yeah...i'm kinda tight on cash right now so I'm wondering if for now I should just have the 24t sprocket mounted...use the 44t normally, and when I come to a flat stretch just hop off and manually shift the chain over. (I could have a little pouch behind the seat of tools I would need to take the slack out of the chain) Its a pretty foolproof idea and what I'm doing is just taking that extra power from my engine and putting it to use. I recomend that you do this yourself because as you can see in the attachment, there is plenty of room for a smaller sprocket on the average bike.

What do you think?

MaxPower · Nov 25, 2009

It took a fair amount of R and D but I'm pleased with how my transmission turned out. I'm going to take the motor off and put a 4 stroke on it just as soon as spooky tooth gets them in stock. I'm having reservations about the grubee 4g box but I know Roland is a stand up guy and will replace it if its crap. He said his kit is going to cost 250-300 dollars. As far as shifting is concerned, I'll never go back to single speed. can't wait to see SBP 4 cycle shift kit. peace

.

toker_ace · Nov 26, 2009

Lets build it right here in the kitchen! LOL! I ordered my jackshaft a couple of days ago. I'm like a kid at christmas. Just two more days. I'll keep ya'll posted.

Maxvision · Nov 26, 2009

MaxPower said:
It took a fair amount of R and D but I'm pleased with how my transmission turned out. I'm going to take the motor off and put a 4 stroke on it just as soon as spooky tooth gets them in stock. I'm having reservations about the grubee 4g box but I know Roland is a stand up guy and will replace it if its crap. He said his kit is going to cost 250-300 dollars. As far as shifting is concerned, I'll never go back to single speed. can't wait to see SBP 4 cycle shift kit. .

First Tandem I've seen with a motor on it MaxPower. I bought an old rusty tandem last summer with plans to put 2 motors on it. You've re-inspired me to do a little more planning on it...Thanks

Dug out my photoshop prototype. .weld

.

MaxPower · Nov 26, 2009

If you need help with the Tandem shoot me an email. I got most of the parts for the trans from Staton-Inc motorized bicycles, bike kits & gear drive kits..

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