Anyone can address what stiffer and lighter between the 2? After all with rotor press fit caps you can use both on a frame with bb86 shell. What would you go for and why?

Thanks

I don't think there is much difference aside weight. The 3D+ is just a bit lighter because the larger hole enables to drill out more material.

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Scott Foil Di2 2012
Scott Scale 35 2010

In theory, from stiffness tests comparing cranksets that Fairwheel did, The bigger the axle, the stiffer the crankset generally. Though, its just an observed pattern ....

Btw I wanted to ask if it is necessary to use an adapter of Rotor for their crank or I can use any adapter which fit my bb86 shell?
I.e I am using now the adapter of Shimano inside my bottom bracket (86.5mm shell width on 41mm dimeter), that means I can't use neither the 24mm axle of Rotor nor the 30mm with this adapter?

I have the 3D on my S2 and demo'd a R5 with 3D+...and at 145lbs...I can't tell the difference.

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The Rotor 3D with 24mm diameter axle should work just fine with the Shimano BB86 cups but the 3D+ will require Rotor's Press fit 4130mm BB86 converter bearings which are specific to the BB86 BB shell.

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Michael - The Anaerobic Threshold is neither...

What you have mentioned regarding Rotor press fit adapter 4130 for the 3D+ for the BB86 shell is what also known as BB83? As I understood the 86 and the 83 is the same exact system? My system works with Shimano press fit cups of 41mm ID and 86.5mm shell width.

Actually, I would say Rotor's Press fit 4130 is an 'adapter'. It is just another bottom bracket specific for a certain BB shell and crank (spindle) combination.
If you have a frame with BB86 shell (41mm diameter x 86,5mm width; Scott, Giant, etc) and want to use a Rotor 3DF/3D+ crank, you use the Rotor 4130 bottom bracket cups. Wheter other 30mm cranks are usable with these cups needs to be measured and tested.

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Scott Foil Di2 2012
Scott Scale 35 2010

Right, regardless of spindle length, Cannondale Hollowgram cranks Will Not Work. Zipp Vuma Quads or any cranks with 30mm diameter spindles that conform to Cervelo's BBRight or FSA's BB386 standard will work with Rotor's 4130 adapters on frames with a BB86 bottom bracket shell.

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Michael - The Anaerobic Threshold is neither...