Rotor 3d+ and bb386

[Tinea Pedis]

Have landed myself the Rotor power meter to review, which comes on 3D+ cranks.

Now, from all I've read (and searched for!) I cannot work out if I can fit these without needing to remove the FSA bb386 adapter cups that have been installed on my Sempre (bb30 shell)?

[bikerjulio]

deleted, expunged, redacted

[Devon]

Rotor can provide an adapter/shim for this purpose.

[Tinea Pedis]

I thought BB386 was, in fact, an acronym. With the '3' standing for 30mm (read: diameter of the axle) and the '86' referring to the spacing (read: same as 24mm width axles). Idea being you get the oversized axle with the wider length that comes with standard 24mm axles.

I'll stand corrected though.

Rotor can provide an adapter/shim for this purpose.

Aware of this.

What I'm asking is can the current cups I have in there accept the crank, without the need for the adapters.

[Devon]

Ah I see, sorry. I know a few people who run Rotor cranks so will ask around.

[dudemanppl]

It'll fit perfectly I think. Rotor cranks come with a looong spindle so you can do BSA30, and because of that BB386 is the native fit for the 3D+ (BB30/BBRight require adapters to fix the extra spindle length). BB86 = 24mm spindle, BB386 = 30mm spindle. Gotta love these standards.

[bikerjulio]

OK I was misreading.

there is this Rotor BB chart

http://www.rotoruk.co.uk/pdfs/RotorUk_StandardDeviation.pdf

What's irksome is that the chart indicates you need a "BB30 bearing kit" but then Rotor does not produce one, which may mean that there's nothing special needed, but it would have been nice to explain.

Although Rotor don't call it this, I believe the crank is effectively a 386 EVO. So looks like your existing BB30 bearings and spacers will work.

[Tinea Pedis]

Ta guys. That's what it seemed like to me.

I'll fit them up tonight and report back.

and because of that BB386 is the native fit for the 3D+.

That's exactly how I interpreted it. However finding info online for it is pretty tricky.

[audiphile]

Curious if anyone has run into an issue installing a Rotor 3d+ on a BB386 frame. Just picked up a '14 Jamis Xenith SL and can get a Shimano and GXP crank to install without issue running the necessary adaptors, but the Rotor 3d+ seems to come into contact with the frame before getting tight enough. Seems like the spindle is too short, but I know others who have successfully installed this crank on their BB386 frames so just curious if there is something me and the LBS mechanic are missing or if this is a uniquely incompatible frame.

[AndreLM]

My understanding is that Rotor 3D+ are im BB386, so you should try to install without the spacers / adapters.


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[audiphile]

Agreed that it should be BB386 and no adapters used (spec calls for 2.5mm spacer on NDS and DS), but not working quite right.

[AndreLM]

Ok. My frame is PF30, and I will have to use adapters (I will start assembly next week). If I am not mistaken, there was a thread a few weeks ago about this same configuration (from Tinea Pedis, I think).


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[wpccrunner]

what bottom bracket do you have installed?

[AndreLM]

I will use Chris King PF30. I initially planned on using c-bear to avoid the spacers, but they ran out of stock for my configuration


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[audiphile]

Tinea Pedis' issue was different from what I am posting about. I have a BB386 frame with the Rotor 4630 BB (native BB386 BB for the 3D+ crank) and the spindle seems to be too short as I can't get it to sit in the frame without binding against the frame and if I add more spacers to avoid the frame contact, I can't get the DS arm to sit on the spindle. Almost seems like the bike may be closer to a BB90 width, but need to get an accurate way of measuring this to confirm.

have contacted both Rotor and Jamis and neither seem to know why this would happen.