Triple to double
10-14-18 | 06:39 PM
#26
Junior Member
Joined: May 2014
Posts: 180
Likes: 16
may I ask where you found a 74bcd 36 tooth ring. I have converted my tandem wrap 11 speed and installed new fsa cranks. Moved the outer ring to the middle position and bought a 110bcd 36t only to discover its a 74bcd on the inner. I can’t locate a 74bcd 36t or 34t anywhere.
10-15-18 | 09:32 AM
#27
Full Member
Joined: Dec 2010
Posts: 434
Likes: 13
From: Central Coast, California, USA
Bikes: Co-Motion Macchiato, Calfee Dragonfly, Ancient Sun Fixie, Trek 5900
10-18-18 | 01:15 AM
#28
Junior Member
Joined: Oct 2009
Posts: 136
Likes: 18
From: National Capital Region
Bikes: Specialized Tarmac Pro, Bilenky Coupled Tandem, Calfee Tetra Tandem
may I ask where you found a 74bcd 36 tooth ring. I have converted my tandem wrap 11 speed and installed new fsa cranks. Moved the outer ring to the middle position and bought a 110bcd 36t only to discover its a 74bcd on the inner. I can’t locate a 74bcd 36t or 34t anywhere.
https://www.ebay.com/itm/STRONGLIGHT...EK6m:rk:1:pf:0
11-02-18 | 10:07 PM
#29
Senior Member
Joined: Oct 2016
Posts: 60
Likes: 0
may I ask where you found a 74bcd 36 tooth ring. I have converted my tandem wrap 11 speed and installed new fsa cranks. Moved the outer ring to the middle position and bought a 110bcd 36t only to discover its a 74bcd on the inner. I can’t locate a 74bcd 36t or 34t anywhere.
10-14-25 | 03:23 PM
#30
Junior Member
Joined: Oct 2009
Posts: 136
Likes: 18
From: National Capital Region
Bikes: Specialized Tarmac Pro, Bilenky Coupled Tandem, Calfee Tetra Tandem
A number of years ago I changed my calfee from a 3x9 to a 2x11. Really all I did was change the front ring sizes and put a bash guard in the position of the outer chainring and switch the rear cassette to an 11 speed. We recently went on a multiday ride and the chain kept dropping between the front two chainrings on every down shift (upshift was never a problem). It never shifted well before but when we were really tired and want to get to the small chainring it's super annoying when it drops in between.
I figure it's happening because the 11speed chain is narrower (outside to inside not length of link) and the space between the chainrings on the 9speed spider is wider to allow for the wider 9 speed chain.
I've been looking for a new spider as I figure that's a cheaper way to go than all new cranks. Searching the internet it looks like the spider mount is an old Shimano mtb standard. Attached picture.
Any ideas on where I could get a new spider or am I looking at new cranks?
I figure it's happening because the 11speed chain is narrower (outside to inside not length of link) and the space between the chainrings on the 9speed spider is wider to allow for the wider 9 speed chain.
I've been looking for a new spider as I figure that's a cheaper way to go than all new cranks. Searching the internet it looks like the spider mount is an old Shimano mtb standard. Attached picture.
Any ideas on where I could get a new spider or am I looking at new cranks?
11-08-25 | 11:47 AM
#31
Senior Member
Joined: Nov 2006
Posts: 1,327
Likes: 115
From: Encinitas, CA
I did this recently. Had an FSA triple with 50/39/28. I got rid of the outer chain ring and used a 46T in the middle position and changed the inner ring from 28T to 30T.
The 46T is an Origin 8 and was made to be an outer chain ring so I had to install it backwards so the ramps and pins are on the outside which do not do anything.
Still it shifts pretty well. I changed the the FD to SRAM Force 22 and I have SRAM Red 10 speed rear shifter. the cassette is 12-36 so my higher gear is 46/12 which we spin out out 28 mph.
I thought it would be ok, but on some hills it is not high enough. My freehub won't fit an 11 speed cassette but I ordered one of these 11-36 11 speed cassettes that fit on a 10 speed freehub.
I have a spare Force 11 speed shifter so I will be using that.
https://velo-orange.com/products/11-speed-cassettes
The 46T is an Origin 8 and was made to be an outer chain ring so I had to install it backwards so the ramps and pins are on the outside which do not do anything.
Still it shifts pretty well. I changed the the FD to SRAM Force 22 and I have SRAM Red 10 speed rear shifter. the cassette is 12-36 so my higher gear is 46/12 which we spin out out 28 mph.
I thought it would be ok, but on some hills it is not high enough. My freehub won't fit an 11 speed cassette but I ordered one of these 11-36 11 speed cassettes that fit on a 10 speed freehub.
I have a spare Force 11 speed shifter so I will be using that.
https://velo-orange.com/products/11-speed-cassettes
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