Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Shimano 3spd coasting system conversion

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Shimano 3spd coasting system conversion

Old 04-13-15, 01:34 PM
  #1  
nasium
Newbie
Thread Starter
 
Join Date: Sep 2006
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Shimano 3spd coasting system conversion

Need some help with a Shimano 3spd internal hub. I have a Trek Lime bike that is an automatic and I want to convert it to a 3spd shifter. Here's a link to the Trek Lime and it's Shimano 3spd Coasting hub.

Park Tool Co. ParkTool Blog Shimano Coasting System

Will I be able to convert this hub to a manual 3spd shifter? Or, was this hub designed specifically for the auto shiifting Trek Lime?

Many thanks!
nasium is offline  
Old 04-13-15, 03:28 PM
  #2  
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Posts: 6,927

Bikes: 03 Raleigh Professional (steel)

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
No, the hub wasn't designed for the bike. But the bike might have been designed for the hub.

There are several considerations, notable among them, how are you going to mount the shifters and the shift cable?

Measure the distance between the rear dropouts and compare to external shift alternatives.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline  
Old 04-13-15, 09:20 PM
  #3  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 11,805

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1809 Post(s)
Liked 74 Times in 57 Posts
Sure looks like the axle end and push rod will play nice with a bell crank from a 333 hub. Unknown if the push rod amount of movement is the same as the old 333 hub's. But I suspect it is. By my eyes it seems to be an easy discovery to attach a bell crank and cable with a lever then find out how it all works. The source for these parts will be a shop that has a lot of used/scavenged parts or just Craigs list an old bike. As an example the trigger lever is no longer available as a new part. Securing the cable will be the least of the challenges. Andy.
Andrew R Stewart is offline  
Old 04-14-15, 12:37 PM
  #4  
nasium
Newbie
Thread Starter
 
Join Date: Sep 2006
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks for the replies. I have sourced a 333 bell crank Shimano 3 Speed Bell Crank Classic Vintage Bicycle Parts | eBay but the lever might be tough to locate. Can I use this as a lever? New Economy Shimano 3 Speed Twist Shifter with Cable Housing and Brake Lever | eBay I wonder how long that cable is, I need a cable 48" long.

Newbie question, why would I need to switch out the bell crank? Would it be possible to just buy the twist shifter above and run the cable??
nasium is offline  
Old 04-14-15, 02:16 PM
  #5  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,396

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6899 Post(s)
Liked 238 Times in 196 Posts
Bell crank is the Mechanic's name for the way the L shaped piece Functions.. that converts a Pulling force with the cable , in this case,

converting it into a pushing force to push on the end of the rod that actually moves the parts in the Hub that cause the gears to shift.

you can cause the cable to be Pulled with the Grip shifter or a trigger shifter .. if you wish..



Rather than pushing In, .. the competitor, Sturmey Archer, shifts by pulling outward a pin screwed into the hub..

Last edited by fietsbob; 04-14-15 at 02:19 PM.
fietsbob is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
miamimike
Commuting
0
01-01-11 10:19 PM
bikerbert
Northern California
0
08-26-08 02:07 PM
Moistfly
General Cycling Discussion
1
04-18-05 03:10 PM

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.