Components - Rotor cranksets

On this page: Rotor 170mm RS4X crankset

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Rotor 170mm RS4X crankset with 30/39/50 chainrings and Italian bottom bracket. Lightly used, $1,200.00

The crankset comes with the owner's manual, which we have also posted below the crank pictures.

Rotor crankset owner's manual.

As the crank rotates, this brilliantly designed crankset has the top crank arm zip over the top so that it is 15 degrees past top dead center when the other (lower) crank is at the bottom.

The result? The dead spot when the crank arm is at the top of its revolution and the leg exerts little downward (rotational) force is eliminated. The crank arms move relative to each other and do not remain collinear.

Here's a drawing of a Rotor crank showing the left arm past top dead enter while the right arm is at the bottom of the stroke.

• Rotor claimed that this crankset's design gave a 10% boost in available power while climbing and accelerating.
• This crankset has an Italian bottom bracket.
• Because it is out of production, bottom brackets of other threadings are virtually unavailable.

Here's our lightly used Rotor crankset.

From behind

Here's a look at the backside of the crankset.

From a slightly different angle

Close-up of the mechanism

Another view

It's not made like other cranksets.

It was originally mounted on a Mondonico bike. Here's how it looks installed.

We still have the box it came in.

Here's the warning that comes with the crankset. Installing this crankset is not like installing other cranksets.

Here's the Rotor RS4X crankset owner's manual:

It has installation & maintenance instructions as well as a parts list and exploded drawings of the parts.

Here's the cover

A warning to use care when installing or using your Rotor crankset

Table of contents

Rotor Manual page 1

Page 2

Page 3

Page 4

Page 5

Page 6. The crankset is installed.

Info on Rotor crankset care and use

More maintenance info

Specs

First page of the spare parts list

Spare parts list page 2.

First page of exploded crank parts

Second page of exploded crank parts

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Third page of crank parts drawings

Fourth page of crank parts

Warranty page

Back cover