Anyone had to do this? I can't seem to make it work. I have two 11cm spacers, a 1mm washer, and then the BB30 bearings and covers/dust shields. If I include the 1mm washer it binds up a lot. If I don't there is a bit of lateral play and the pre-load adjuster on the crank is almost all the way in.

No experience and this may not solve the issue but seems like Rotor's Press fit 4630mm converter is designed for this issue.

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Michael - The Anaerobic Threshold is neither...

ms6073, that's just a regular BB. It won't help in this situation.

KWalker, is the preload adjuster all the way in or almost all the way in? If it's not bottomed out, it sounds like you don't need that 1mm spacer. What crankset are you using?

Rotor 3D+ SRM

I think that BB is actually a BBRight BB, but its not on the Rotor USA site or sold in the US yet. I can't tell if it actually is a BBRight bb because it appears that the bearings sit outboard in place of the spacers you'd run with a bb30 bb and BBright crank.

indeed i am trying to do the same thing!
I have a BBright FSA crankset off a 2012 cervelo S5, which i want to use on my cannondale synapse with BB30.
I'm thinking that the bbright spindle is 34mm from center to driveside (like BB30 crank spindles) but 45mm from center to non-driveside (1.1cm longer than BB30 cranks). so then i am assuming i need a 1.1cm spacer!!!?? on the non-driveside... this seems like it would look pretty ugly, and might not even work if there is nothing on the left side of the spindle to retain the spacers. does this make any sense to anyone?

What is the frame? BB30 or Pressfit 30.
Also matters what BB you have because for example Cannondale bearing shields are not as thick as the Truvativ/Sram shields.

http://www.rotorbikeusa.com/pdf/3dplus_ ... 2-8-10.pdf