freewheel adapter for square taper spindle

MaxPower · #1 10-10-2009, 11:52 PM

I'm doing a project with a tandem bike and want to use the rear riders bottom bracket as a jackshaft. I'm having problems finding a dual sprocket. I need a freewheel adapter for a square taper spindle that can accommodate two freewheels. I've attached a picture of what I'm thinking.

Also, If it use a Keyed shaft with a two freewheel adapters, how would I adapt the shaft to the bikes bottom bracket. Do they make bearings that can thread into the bottom bracket?

bairdco · #2 10-11-2009, 12:49 AM

i dunno about the freewheel adapter, but you can get a three piece crank bottom bracket adapter (american to european conversion, technically) from bikepartsusa.com for $17.58...Pyramid 3 pc, Bottom Bracket Conversion Kit | BikepartsUSA

i know they make sealed bearing set ups, too, and there's a kit that has two aluminum pieces that bolt in to your frame so you can run any euro bottom bracket you want, but those are more spend-y.

hope this helps.

MaxPower · #3 10-11-2009, 01:14 AM

yeah... not much help. I was thinking that I could find a bolt that fits freewheel threads and then find someway to cut the square taper into the bolt. Does anyone know if a bolt like this exist or if a mechanist can cut a square taper into a bolt? I was also thinking of starting with a tapered crank and cutting the crank off and treading it. What is the thread size of a freewheel? how would I describe it to someone I wanted to buy it from?

Blakenstein · #4 10-11-2009, 03:28 AM

Spindle??????????????? what ,......for your disk brake?????hahahahahahahahahahahahahahahahahahahaha hahahahlololololololololololololololololol you better get your spider gears working firsthahahahahahahahahahahahahahahahahahahahahahah lololololololo:

Blakenstein · #5 10-11-2009, 03:31 AM

Im havin prblems with my crown and pinion.. maybe you could help hahahahahahahahahahahahahahahahahahahlolololololol ololoolololololol

MaxPower · #6 10-11-2009, 05:43 PM

I don't understand whats funny. please enlighten me.

Junster · #7 10-12-2009, 04:04 PM

SBP sells a set of cranks, hvy duty freewheel, duel sprocket setup for their shift kit. It would be only on the right side. If you used a shift kit and a extra set of cranks, fw, sprockets for the rear pedals you could get it to work.

MaxPower · #8 10-12-2009, 04:23 PM

here is a better picture of what I'm trying to do

Junster · #9 10-12-2009, 04:49 PM

Will there be pedals on the rear bottom bracket?

NEAT TIMES · #10 10-12-2009, 04:51 PM

Max Power, Interesting!! You Do Have A Bit Of A Challenge. If There Is A Way To Use Sealed Bearings In The Bottom Bracket Housing And A Keyed Shaft With Staton Free Wheel Adapters. Bearings With Outer Snap Rings. Then You May Need A Wider, Longer Front Pedal Spindle To Line Up With Back Sprockets. When You Go To A Machinist, It Gets Expensive In A Hurry. Where Is Your Girl Friend Going To Put Her Feet?? Or Will It Be A Cargo Bike? Good Luck. We Will Be Watching You!! Lol. Ron .