Following up my earlier post a couple days ago regarding selecting a power meter. Decided to go with the Power2Max and of course they are sold out of the Classic model for the Rotor 3D model…still have for the 3D+ and the 3Df. I’ve “ask the engineers” at Cervelo two days ago but no response (responses have been considerably slower since Damon left). Appreciate any help how I can identify which model is on my bike…2011 P4 bought new in January 2012. Thanks much.
You’ll need a new BB with those as they are both 30mm spindles. I believe a Rotor BSA30 will work with your 2011 P4 and the Rotor 3D+ or 3Df. The 3D+ and 3Df are pretty much the same with the exception that the f has some forged parts vs everything CNC meaning its about 60g heavier.
You’ll need a new BB with those as they are both 30mm spindles. I believe a Rotor BSA30 will work with your 2011 P4 and the Rotor 3D+ or 3Df. The 3D+ and 3Df are pretty much the same with the exception that the f has some forged parts vs everything CNC meaning its about 60g heavier.
Thanks Rodney. But sounds like I still need to determine what model Rotor I have now so I know whether or not to get the correct BB?
Measure the spindle diameter it’s either 24mm or 30mm 
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Measure the spindle diameter it’s either 24mm or 30mm
rbuike, sent you pm
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Bikepedia has your model bike running a BB1 bottom bracket. This is a 24mm diameter. The crank is listed as 3D, which supports this.
A P2M S for a Rotor 3D24 without crank should fit onto your existing crank.
Caveat, what’s on your bike may be different. This info is based off five minutes on Google searching “2011 P4 Rotor” and also looking at images.
You can remove your crank with two allen wrenches. Instructions at http://www.rotorbikeusa.com/pdf/3d_manual_8-18-10.pdf.
Measure the spindle. If it’s 24mm, you have a 3d. If it’s 30mm you have a 3d+.
If you have a threaded/external bottom bracket, it’s likely you have a 24mm/3d. JBF seems to support this.
Hi folks,
an easy way to differentiate between the Rotor 3D (now called 3D24) with 24mm axle and the 30mm model (Rotor 3D30 / 3DF / 3D+ / Flow) is by looking how the cranks are mounted:
3D / 3D24: no bolt on the drive side. Non-drive side crank arm is installed with a pinch bolt and there is a bolt to set lateral bearing play on the non-drive side.
3D30 / 3DF / 3D+ / Flow: there is a big bolt on drive side and no pinch bolt on the non-drive side. Lateral bearing play is set with a ring on the non-drive side.
I hope this helps figuring out which model you have!
Best
Nicolas
The support from Nicolas on Slowtwitch is yet another reason to go with Power2max.