Go Back  Bike Forums > Bike Forums > Tandem Cycling
Reload this Page >

Questions on child stoker kits

Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

Questions on child stoker kits

Old 10-03-11, 10:31 AM
Senior Member
Thread Starter
Join Date: Dec 2005
Location: Richmond, VA
Posts: 415

Bikes: Torelli Titanio; Serotta Atlanta Concept; Specialized Rockhopper, Raleigh Twenty, Velo Orange Polyvalent

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Questions on child stoker kits

I have a square taper BB assembly for a child stoker kit and want to cobble together the rest of the kit, for, I hope, less money than the kits cost. I have a few questions and would appreciate any help you can offer.
1. Can I use any properly-sized crank for the child stoker, or do I need one designed to have the chainring on the left side?
2. The rear synchronization chainring (probably has a shorter name, but I don't know it) is 32T. Does that mean I need to use 32T chainrings to connect the child stoker's crank to the drivetrain, or will it all work fine if I just make sure my connecting chainrings have the same number of teeth? (I expect this question exposes my ignorance of some basic principal of physics or something, but there you go.)
3. Anything else I need to keep in mind in assembling my kit?
harlond is offline  
Old 10-04-11, 07:04 AM
Certifiable Bike "Expert"
Join Date: May 2005
Posts: 5,647
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
1. If you use a normal crank for your kid stoker setup, it will be on backwards. This means that the threading for the pedals will be backwards (reverse threaded on the right side, normal on the left). That will have two effects: the pedals will be backwards and the threading will not tend to keep them tight. Pedals backwards might be a problem if you use toe clips (you probably should!) or some kind of clipless other than Speedplay.

I have a cheaper kid stoker setup that uses a 140mm Bulletproof (now Origin8) BMX crank. For the pedals, I used some regular old toe-clip-friendly pedals, disassembled them and switched the RH and LH pedal spindles. Then I used blue Loctite on the spindle threads so they wouldn't back out of the crank. This has worked perfectly.

2. The captain-stoker sync chain on the stoker doesn't need to have the same tooth count on its rings as the stoker-kid stoker sync chain. But, for each chain loop, the tooth count of its rings must match. Does that make sense?

Example: 34t captain, 34t/32t outer/inner on stoker, 32t on kid stoker crank. One chain goes around both 32t rings, one around both 34t rings. This will work fine.

3. You will probably need to come up with a high-rise handlebar scheme.
Phantoj is offline  
Related Topics
Thread Starter
Last Post
Road Cycling
06-03-15 09:51 PM
Bicycle Mechanics
06-24-13 01:20 AM
Classic & Vintage
04-28-10 10:47 AM
Road Cycling
05-17-09 02:57 PM
Bicycle Mechanics
10-20-05 05:56 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.