Shimano 3spd coasting system conversion
04-13-15, 01:34 PM
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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!
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!
04-13-15, 03:28 PM
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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.
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.
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04-13-15, 09:20 PM
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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.
04-14-15, 12:37 PM
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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??
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??
04-14-15, 02:16 PM
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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..
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.
