Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

770euro from Power2max. Which to be fair is a nice price. They also have a 165mm option. But in my experiance Rotor offically come in 165mm. But in reality no one has them, as they dont really bother producing them.

I was kinda hoping for something cheap from ebay etc. I could retro fit to my existing cranks. Money is going to be tight this year.

I'd be very surprised if your Rotor 3D 165mm road cranks differed in any way from my Rotor 3D 165mm track cranks.

I reckon they just chuck a different spider on there.

Whether the importer/distributer would be at all interested in swapping a spider is a different question of course.