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50-34 chainrings for Cannondale Super Six

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50-34 chainrings for Cannondale Super Six

Old 11-10-21, 08:23 AM
  #1  
waters60
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50-34 chainrings for Cannondale Super Six

I am looking to change from 52-36 to 50-34 on my 2020 Super Six. The crankset is Cannondale’s SI ( not Hollowgram ) I can’t seem to find chainrings anywhere online.
Any thoughts?
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Old 11-10-21, 10:05 AM
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bruce19
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Old 11-10-21, 10:38 AM
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Don't the Hollowgram rings fit the Cannondale One crank and spindle? With many things in short supply for new bikes, I'd get on Cannondale's site and push that button that says "check local bike shops" and then call each one.

Otherwise what BB shell is on that frame? If you are willing to have the BB changed and get an entirely different crankset you'll have more options and might find something decent considering the current inventory scarcity.
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Old 11-10-21, 05:06 PM
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you can also order a 5 bolt spider for the cannondale crank and then run normal chainrings from any manufacturer
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Old 11-11-21, 05:25 AM
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Originally Posted by waters60
I am looking to change from 52-36 to 50-34 on my 2020 Super Six. The crankset is Cannondale’s SI ( not Hollowgram ) I can’t seem to find chainrings anywhere online.
Any thoughts?
What are the existing chain rings? Are you looking for (a) 4 bolt chain rings, (b) 5 bolt chain rings, or (c) Cannondale Spidering?
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Old 11-15-21, 08:14 PM
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msu2001la
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I'm pretty sure the SI and Hollowgram SI/SISL2 cranks all run the same chainrings.

​​​​​https://www.amazon.com/Cannondale-Sp...a-574552887732

https://www.biketiresdirect.com/prod...RoCeA4QAvD_BwE
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Old 11-16-21, 02:32 PM
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Old 11-16-21, 07:16 PM
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Originally Posted by SoSmellyAir
What are the existing chain rings? Are you looking for (a) 4 bolt chain rings, (b) 5 bolt chain rings, or (c) Cannondale Spidering?
So the photo posted by waters60 in post #7 above shows a 52T/36T chainring set mounted on a 120 BCD 4 arm spider. The problem is that a 36T chainring is the smallest that fits on this spider. A Cannondale 110 BCD 5 arm spider is needed to fit a 50T/34T chain ring set.

Cannondale HollowGram Spider 110mm BCD Road Compact QC693/ (bicyclebuys.com)

Cannondale Hollowgram SL Spider, 110mm BCD, Road Compact, QC693 (cannondalespares.com)
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Old 11-17-21, 04:59 AM
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Originally Posted by SoSmellyAir
So the photo posted by waters60 in post #7 above shows a 52T/36T chainring set mounted on a 120 BCD 4 arm spider. The problem is that a 36T chainring is the smallest that fits on this spider. A Cannondale 110 BCD 5 arm spider is needed to fit a 50T/34T chain ring set.

Cannondale HollowGram Spider 110mm BCD Road Compact QC693/ (bicyclebuys.com)

Cannondale Hollowgram SL Spider, 110mm BCD, Road Compact, QC693 (cannondalespares.com)
50/34 from my Synapse.
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Old 11-17-21, 06:25 AM
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Originally Posted by SoSmellyAir
So the photo posted by waters60 in post #7 above shows a 52T/36T chainring set mounted on a 120 BCD 4 arm spider. The problem is that a 36T chainring is the smallest that fits on this spider. A Cannondale 110 BCD 5 arm spider is needed to fit a 50T/34T chain ring set.

Cannondale HollowGram Spider 110mm BCD Road Compact QC693/ (bicyclebuys.com)

Cannondale Hollowgram SL Spider, 110mm BCD, Road Compact, QC693 (cannondalespares.com)
50/34 from my Synapse.
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Old 11-17-21, 09:58 AM
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Originally Posted by waters60





50/34 from my Synapse.
Any BCD markings? I cannot see. But assuming that both of your bikes use the exact same crank spider, i.e., 120/90 BCD, there is still another difference. On your Super Six, both chainrings are mounted on the outer (i.e., 120 BCD) holes of the crank spider, whereas on your Synapse, the large chain ring is mounted on the outer holes and the smaller chain ring is mounted on the inner (i.e., 90 BCD) holes. So you may want to try an FSA 120/90 setup comprising a 120 BCD 50T and a 90 BCD 34T chainrings, available directly from FSA:

Gossamer PRO 2x BCD 120/90 | FSA (fullspeedahead.com)

Last edited by SoSmellyAir; 11-17-21 at 10:10 AM.
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