Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-01-16, 02:48 PM   #1
Tandem2
Senior Member
Thread Starter
 
Join Date: Jan 2016
Bikes: Ibis Mojo HDR, Devinci Atlas, Walt Works 29er, Cannondale EVO, Co-Motion Supremo
Posts: 88
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Calfee BB shell change

What are owners of the original smaller Eccentrics thoughts?
Is it serviceable? Or should it be avoided like the plague?

Last edited by Tandem2; 02-01-16 at 05:54 PM.
Tandem2 is offline   Reply With Quote
Old 02-02-16, 12:31 PM   #2
jnbrown
Senior Member
 
jnbrown's Avatar
 
Join Date: Nov 2006
Location: Encinitas, CA
Bikes:
Posts: 1,009
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Quote:
Originally Posted by Tandem2 View Post
What are owners of the original smaller Eccentrics thoughts?
Is it serviceable? Or should it be avoided like the plague?
If I understand your question, the eccentric that Calfee provided was unacceptable. Replaced it with a Bushnell which is great.
Not a big deal but did cost extra.
jnbrown is offline   Reply With Quote
Old 02-02-16, 12:56 PM   #3
Tandem2
Senior Member
Thread Starter
 
Join Date: Jan 2016
Bikes: Ibis Mojo HDR, Devinci Atlas, Walt Works 29er, Cannondale EVO, Co-Motion Supremo
Posts: 88
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by jnbrown View Post
If I understand your question, the eccentric that Calfee provided was unacceptable. Replaced it with a Bushnell which is great.
Not a big deal but did cost extra.
My understanding is that the first generation calfee eccentric was smaller, prohibiting an easy swap. In reading the tandem geeks write up, he sent his front triangle back to calfee, who in turn bored out the front BB shell to accept either Calfee's 2nd generation larger eccentric or a Bushnell.
I was looking at a 2009 calfee that apparently has the first gen smaller bore and eccentric.

Last edited by Tandem2; 02-08-16 at 06:18 AM.
Tandem2 is offline   Reply With Quote
Old 02-02-16, 01:26 PM   #4
akexpress
Senior Member
 
Join Date: Nov 2007
Location: Anchorage, Ak
Bikes: Calfee Tetra tandem, Ventana ECDM 26, Ventana ECDM 29r, Orbea Orca, Santa Cruz Carbon 5010
Posts: 497
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
my 2008 frame had the larger bore and I replaced the eccentric with a Bushnell after about a years use of the original Calfee one. The Calfee one was not really a problem just harder to adjust. I use the same type on our fat tire tandem as Ventana specs the same as the original Calfee one.
akexpress is offline   Reply With Quote
Old 02-02-16, 01:35 PM   #5
Tandem2
Senior Member
Thread Starter
 
Join Date: Jan 2016
Bikes: Ibis Mojo HDR, Devinci Atlas, Walt Works 29er, Cannondale EVO, Co-Motion Supremo
Posts: 88
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by akexpress View Post
my 2008 frame had the larger bore and I replaced the eccentric with a Bushnell after about a years use of the original Calfee one. The Calfee one was not really a problem just harder to adjust. I use the same type on our fat tire tandem as Ventana specs the same as the original Calfee one.
Hmmm. Maybe I should have that shop do a test swap.
That was a deal killer for me, if I did'nt have the option.
Tandem2 is offline   Reply With Quote
Old 02-07-16, 08:43 PM   #6
wtandem
Senior Member
 
Join Date: Oct 2006
Bikes:
Posts: 63
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I bought my Calfee in late 2003. Not sure how to tell if it is the early design, but from the other postings seems like it probably is. No problems in over 12 years and about 50,000 miles.
wtandem is offline   Reply With Quote
Old 02-08-16, 07:30 PM   #7
twocicle
Clipless in Coeur d'Alene
 
twocicle's Avatar
 
Join Date: Mar 2012
Location: Coeur d'Alene, Idaho
Bikes: Calfee Dragonfly S&S Tandem, Specialized Tarmac SL4 S-Works, other misc Road & MTB singles
Posts: 1,707
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 38 Post(s)
This link from TandemGeek's blog shows Calfee's eccentric at the bottom left, and the Bushnell near the top right.

TandemGeek's use of square taper BB adjusts by applying inward pressure to the BB cups. That does not work very well with Calfee's 2-piece eccentric. Since the Bushnell eccentric has a solid center core, the BB cups will screw into this and any adjustment pressure is applied to the ecc core, not the frame shell, which works better for his case.

Calfee's ecc can be a bit tricky to get the two side to align perfectly when using external BB bearings (think HollowTech or MegaExo, etc) since these BB types do not provide their own cores. It can be especially tricky when trying to set a specific tightness for a Gates belt. The Bushnell BB helps keep everything properly aligned. The Bushnell is also a better option for Gates belt users as it allows the ecc to be setup a little left or right to improve alignment with the rear timing ring.

I have no experience with older and possibly smaller Calfee shells, but only the "newer (+2008?) aluminum sleeved shells which are compatible with either the Calfee two-piece or Bushnell shell.

FWIW, I actually got DaVinci's version of the Bushnell from Mel at Tandems East. This one has some extra gripper notches, etc, and the price was good too. If curious, call Mel and ask about it.

Tip: An added benefit with the Bushnell, is the ability to flip the core and have the ecc tightening screw on the left hand side. This is useful if using right-side drive setups (ours for example).

Last edited by twocicle; 02-09-16 at 02:10 PM. Reason: typo
twocicle is offline   Reply With Quote
Old 02-09-16, 09:45 AM   #8
mtseymour
Senior Member
 
Join Date: Nov 2010
Location: Vancouver, BC
Bikes: 2014 Calfee Tetra, 2014 Norco Carbon Sight, 2016 Giant TCR
Posts: 238
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Quote:
Originally Posted by twocicle View Post
Tip: An added benefit with the Bushnell, is the ability to flip the core and have the ecc tightening screw on the left hand side. This is useful if using right-side drive setups (ours for example).
Good tip.

Another benefit of the Bushnell is that it can accommodate large diameter BB. My Lightning crank's bearing cups are about 7mm larger in diameter than the Shimano Hollowtech BB. As a result, the cup partially block the two Allen bolts on the Calfee eccentric (current version). This made it impractical to adjust the eccentric. The Bushnell uses a single Allen bolt that will work with any bearing cups, plus it's more secure.
mtseymour is offline   Reply With Quote
Old 02-10-16, 06:21 AM   #9
Tandem2
Senior Member
Thread Starter
 
Join Date: Jan 2016
Bikes: Ibis Mojo HDR, Devinci Atlas, Walt Works 29er, Cannondale EVO, Co-Motion Supremo
Posts: 88
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks for all the replies, they helped confirm my gut feeling.
I was actively pursuing the bike toomany put me on, but saving a little $ up front won't amount to much value if the bike is a pita to setup and maintain.
Our value level Fuji has a Bushnell (or a copy) that has been perfect, so going forward I want to stick with that level of dependability.
Tandem2 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 08:42 PM.