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Rotor 3D+ Micro Adjust Spider Crank

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As the lightest rotor crank for racing bikes, the 3D + uses the new 7055 aluminum and a TDS technology redesigned construction to reduce weight while increasing rigidity. For advanced Q-Ring users, a MAS Spider version is available.

  • MAS-Spider 

  • 100% CNC machined 

  • suitable for oval chainrings (must be ordered separately) 

  • compatible with 9, 10 and 11-speed drives


Alu 7055

Rotor uses only the best materials for the best cranks. 7055 combines the superior physical properties of a 7000 alloy with incredible fatigue resistance. Each rod of raw material is ultrasonically inspected to ensure that it is free of defects inside. From 7055 Rotor manufactures the completely CNC milled cranks like FLOW, 3D + and REX 1. 


Rotor CNC cranks are stiffer than the competitors' cranks due to the Trinity Drilling System (TDS). In this procedure, three full holes are drilled from the bottom bracket to the pedal. This creates a box-like grid, similar to a box girder bridge. As a result, the cranks are extremely stiff and still lose weight, whereby an outstanding relationship between stiffness and weight is achieved. 

UBB System

The UBB System (Universal Bottom Bracket) allows Rotor to use both 24mm and 30mm axle diameter, making it compatible with almost any frame on the market. 

Micro Adjust Spider (MAS)

"MAS" stands for Micro Adjust Spider and means "more" in Spanish. And that's what this technology is about: more setting options for optimizing your Q-Rings. Additional screw holes allow intermediate positions between the existing OCP positions (optimal chainring positions) on the Q-ring. A combination of standard crank and Q-ring provides OCP adjustment in 5 ° increments. MAS together with Q-Rings offers intermediate positions in 2.5 ° increments for OCP adjustment. So you can fine tune the position of your Q-ring according to your personal pedaling behavior.

  • Series: 3D 

  • Material crank arms: Aluminum (7055) 

  • Material Axis: aluminum 

  • crank arm length: 165.0 mm, 170.0 mm, 172.5 mm, 175.0 mm, 177.5 mm, 180.0 mm 

  • catenary: 43.5 mm 

  • Q-factor: 148 mm 

  • Axle diameter: 30 mm 

  • Compatible housing width (for BSA bottom bracket ): 68 mm bottom bracket (recommended): BSA , BB386EVO , BB86 , PF30

  • Application: Road 

  • compatibility: 2- Speed

  • chainring attachment: 110 mm bolt circle, 5-arm

  • weight: black-red / 172.5 mm: 504 g

  • 1 x crank arm rotor 3D +, right, incl. Spider MAS 

  • 1 x crank arm rotor 3D +, left 

  • 1 x crank axle rotor 

  • 1 x crank screw rotor 

  • 2 x spacer 11.5 mm 

  • 2 x plastic disc 

  • 1 x chainring bolt set rotor, 10 -partic 

  • without chainrings 

  • without bottom bracket

Buying Guide

Buying Guide - Handbook

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Distributed by: Country Of Origin: Spain