Stoker Coaster Crank
02-12-19, 06:31 PM
#1
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Bikes: '06 Titus mtb, 2004 Trek T2000 tandem, '88 Merckx 753, '18 Emonda, '91 Cannondale mtb, '19 Trance 29er
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Stoker Coaster Crank
Hello everyone,
It has been a few years I think. Has anyone heard of a company lately that makes a stoker crank capable of coasting when captain is pedalling? Our '04 Trek T2000 that we love has captain drive chain on left side. But if the only option was to convert to all chains on the right side, we could do that too.
Best,
John & Elsa
It has been a few years I think. Has anyone heard of a company lately that makes a stoker crank capable of coasting when captain is pedalling? Our '04 Trek T2000 that we love has captain drive chain on left side. But if the only option was to convert to all chains on the right side, we could do that too.
Best,
John & Elsa
02-12-19, 07:37 PM
#3
Senior Member
The Independent Pedaling System (IPS) tandem cranksets made by Lasco are still available as far as I can tell - I see them on numerous sites, including Wal-Mart, eBay and BikeMan.
I’ve used them in the past and they worked great on both a Burley Duet and a Santana Sovereign. You can use a pair of IPS cranksets so that both riders can coast independently like a da Vinci tandem or just one so that your stoker only (or captain - if you install your one IPS crankset in that position) can coast independently.
They do have a right side timing chain set up. If they are still the same, they will work with a triple 130mm BCD for middle and outer rings and a 74mm inner ring. An old school square taper BB is required and you’ll need a wider-than-usual spindle length and end up with a Q-factor that’s a bit on the wide side, which was perfect for my stoker wife.
We have a da Vinci tandem now (our second one!) which is a more elegant solution for independent coasting, but these IPS cranks do work fine if you’re willing to tinker a bit with the setup. We pedaled in sync for 8 years and have been “independent” for 21 years now and would NEVER go back!
I’d post a link, but I’m still at less than 10 posts so I can’t ...
I’ve used them in the past and they worked great on both a Burley Duet and a Santana Sovereign. You can use a pair of IPS cranksets so that both riders can coast independently like a da Vinci tandem or just one so that your stoker only (or captain - if you install your one IPS crankset in that position) can coast independently.
They do have a right side timing chain set up. If they are still the same, they will work with a triple 130mm BCD for middle and outer rings and a 74mm inner ring. An old school square taper BB is required and you’ll need a wider-than-usual spindle length and end up with a Q-factor that’s a bit on the wide side, which was perfect for my stoker wife.
We have a da Vinci tandem now (our second one!) which is a more elegant solution for independent coasting, but these IPS cranks do work fine if you’re willing to tinker a bit with the setup. We pedaled in sync for 8 years and have been “independent” for 21 years now and would NEVER go back!
I’d post a link, but I’m still at less than 10 posts so I can’t ...
Last edited by Joint Venture; 02-13-19 at 05:34 PM.
02-13-19, 04:01 AM
#4
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Our latest is a da Vinci tandem . Love it and would never go back to a sync setup! 
02-14-19, 06:10 PM
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Posts: 270
Bikes: '06 Titus mtb, 2004 Trek T2000 tandem, '88 Merckx 753, '18 Emonda, '91 Cannondale mtb, '19 Trance 29er
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The Independent Pedaling System (IPS) tandem cranksets made by Lasco are still available as far as I can tell - I see them on numerous sites, including Wal-Mart, eBay and BikeMan.
I’ve used them in the past and they worked great on both a Burley Duet and a Santana Sovereign. You can use a pair of IPS cranksets so that both riders can coast independently like a da Vinci tandem or just one so that your stoker only (or captain - if you install your one IPS crankset in that position) can coast independently.
They do have a right side timing chain set up. If they are still the same, they will work with a triple 130mm BCD for middle and outer rings and a 74mm inner ring. An old school square taper BB is required and you’ll need a wider-than-usual spindle length and end up with a Q-factor that’s a bit on the wide side, which was perfect for my stoker wife.
We have a da Vinci tandem now (our second one!) which is a more elegant solution for independent coasting, but these IPS cranks do work fine if you’re willing to tinker a bit with the setup. We pedaled in sync for 8 years and have been “independent” for 21 years now and would NEVER go back!
I’d post a link, but I’m still at less than 10 posts so I can’t ...
I’ve used them in the past and they worked great on both a Burley Duet and a Santana Sovereign. You can use a pair of IPS cranksets so that both riders can coast independently like a da Vinci tandem or just one so that your stoker only (or captain - if you install your one IPS crankset in that position) can coast independently.
They do have a right side timing chain set up. If they are still the same, they will work with a triple 130mm BCD for middle and outer rings and a 74mm inner ring. An old school square taper BB is required and you’ll need a wider-than-usual spindle length and end up with a Q-factor that’s a bit on the wide side, which was perfect for my stoker wife.
We have a da Vinci tandem now (our second one!) which is a more elegant solution for independent coasting, but these IPS cranks do work fine if you’re willing to tinker a bit with the setup. We pedaled in sync for 8 years and have been “independent” for 21 years now and would NEVER go back!
I’d post a link, but I’m still at less than 10 posts so I can’t ...
02-17-19, 06:53 PM
#6
Senior Member
Thanks! I’d be willing to bet your 2004 Trek has conventional BSA threaded BB shells, so fitting a BB with a square taper spindle will be no problem. The “old school” BB’s are still widely available. You’ll need to mock up the IPS rear crankset and measure carefully to determine the spindle length needed for a good chainline.
