In the process of turning my 2022 Supersixevo SE from 2x into a 1x Sram Mullet 10-52, due to its proprietary Ai geometry nothing is easy: the main problem beeing the 107BCD and the spindle lenght.
Has anyone, other than the pros, tackled this transformation?
On my buy list:
Eagle XX RD
Eagle Transmission 10-52 cassette
Force X-Sync Road Aero DM 44t
Force D2 Dub Wide cranks+spindle
Would appreciate any experienced tips, especially on the above spindle length.
Thanks
Maybe I am missing something, but the relevant SRAM cranks have an 8-bolt interface. If you donāt intend to mount a Quarq power meter, your SRAM chain rings use the 8-bolt interface and BCD is irrelevant as there is nothing to screw into.
BCD is only an issue if you have a Quarq spider-based power meter like I do, then you have SRAM chain rings up to 46 teeth. For larger chain rings, you likely still need to get power meter/chain ring combos.
BCD is an issue with Cannondaleās Ai geometry.
I am currently riding Rival cranksets and spider (chainring is custom made) and could not find a Rival (gen 1 - 4 bolt) alternative for the mullet set up.
I ride a 2019 SuperX with Ai and have dealt with the spindle length issues way, way, way, too much. Dub Wide is not actually wide enough for the Ai 83mm bottom bracket shell. You specifically need to source SRAM Ai width cranks, which are very difficult to find and not particularly new. If you canāt find these; I would buy the following:
This combination is what I run on my SuperX with the same BB as you. You can swap to the orange 125mm spindle if you want to run 2X Hollowgram rings.
Maybe we are splitting hairs, but if I understand you correctly, the issue you have is chain ring clearance, not the BCD, correct?
I know that e. g. Garbaruk makes chain rings with a different offset, which improves clearance.
I have experience with this setup. I found the regular DubWide Spindle worked great for a CX Gear range (10-36), but for some reason I got a lot of noise in the 12-14-16T cogs. I thought it was maybe the chainline being more consequential, so I bought a Passquest chainring with a 3mm offset (instead of 6mm) and it seemed to somewhat quiet the noiseā¦.although I also havenāt ruled out that maybe the āGrey Marketā cassette that I bought could have been a factory 2nd or something and maybe that was the root causeā¦.
No, Max (but thanks), the main issue is a combo of spindle length and chain-line.
Garbaruk does make a 107 bcd 1x chainring that will bolt on the Rival spider, thanks for the tip.
Is your experience specific to my frame (2022 Supersixevo SE) ?
Does the 2022 frame even have UDH? If not, thereās no way to run a T-type derailleur or cassette. Non T-type AXS would work but not Transmission (or XPLR 13).
The frame is not UDH ready, nope.
Thanks for the tip Stephen, I thought the Eagle XX RD would mount on a regular DH.
I suppose the Eagle GX RD is the right component.
Confirm?
Yes and no - Iāve had a 2019 SuperX, a 2022 SupersixEvo SE/CX, and another 2024 SuperSixEvo SE/CX. Iāve done similar setups on both the older (2019) Cannondales and the newer ones (2022) all of which share the same PF83A BB. So yeah it should work with a Force D1 or D2 Dub Wide Crankset, but you may want to consider getting a chainring with less offset like I did to account for the slightly narrower chainline.
Thanks for the tip, Andrew.
As someone who owns a Cannondale Ai bike (Topstone Carbon 2019?) and has spent A LOT of time and money being deep into the Ai crankset nightmare that SRAM/Cannondale created, I would suggest your easiest option is to sell your bike and buy literally any other bike.
The only reason I preserved was that my crank snapped and I needed to replace the crank. Shout-out to SRAM Australia, who were incredibly difficult and painful to deal with throughout the process and only made a modicum of effort when I threatened to take them to court.
Buying a different bike is the best advice youāll get. Every other version will involve considerable time, effort, and money for a debatable outcome with one or more shortcomings that youāll need to live with.
I believe (from the grapevine) that SRAM has decided that the only āsupportā (cough) for Ai is the Apex 1x crankset, which is still available. In theory, thereās probably new old stock (referred to a NOS) floating around of various Ai cranksets somewhere. If you want something specific (as I did, Force D1 46/33), youāll need time and luck. Why do this when there are thousands of perfectly fine bikes that have zero issues with this conversion? Someone will want what you have in its current form.
Hereās a reddit thread discussing wide cranks on your bike: https://www.reddit.com/r/bikewrench/comments/1imoweh/sram_dub_wide_on_cannondale_ai_supersix_evo_se/
This might be something worth looking at towards the end of the thread
āBbinfinite makes a bottom bracket for ai spacing that allows you to use a dub wide crank. Iāve been using one for almost 2 years with no issueā
The bottom bracket in the screenshot is $274. No other bike would require this. Do you really love your Supersix EVO SE this much?
Hereās a link to the Apex crank on an Australian website so you can search for this where you live: Crankset Apex 1X D1 Dub 83-A Cannondale-AI 170 42T Aluminium (BB not included) - The Bike Place
Thanks for the links Andrew.
Yep, selling the frame and move to a more sensible iteration (the new SuperX for example) has been on my mind, truth is, I really like how my SE rides and right now itās totally dialed for me on fast gravel mixed tarmac with a 2x 46/33 + 10-36, I am curious though as how it would perform with a 1x setup on more technical/ vertical race terrain.
I may have found a simple solution with Garbaruk (chainring + cassette) which will partner with my Rival spider + cranks, and I will have to add a GX Eagle AXS derailleur which is 50% cheaper than the current T evolution.
Yes, the Ai āthingā was not thoroughly explained when I bought the bike. I do love the SE though, it just flies.
Welcome 
I noticed this when I bought Garbaruk chain rings for my Shimano XTR M9000 1x crank. I wanted something bigger (38 teeth) and noticed that Garbaruk added an offset to their chain rings the larger they went. On my MTB frame, I probably could have fit a 40-tooth chain ring as well.
I hope youāll find a combo that works for you!
