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In stock £174.99 Buy

With a growing demand, ROTOR is committing to a separate mountain bike crank line named “REX”. The additional line, with its own designation and design will help to clearly distinguish the ROTOR MTB from the road crank line. The new REX MTB cranks are based on the same successful “Trinity Drilling System” technology as all ROTOR cranks, which helps reduce weight and maximise stiffness.

  • Manufactured by forge and CNC machining, it’s 30mm axle makes REX2 the perfect weight to stiffness balance.
  • Available in single ring (REX 2.1) - 175mm

A great value crank in the mountain bike line is CNC machined and Forged from a 7075 alloy.
NO Q rings
Comaptible with singlespeed and 1 x 10/11 groupsets

Delivery Information

Hargroves Cycles offer Free Delivery for all orders over £9 with in Mainland UK (orders below £9 will be charged £1.99)

Bikes and Bulky items are sent via TNT Courier and smaller items are sent via Royal Mail 2nd Class Post.

Items over £50 are sent with Royal Mail 1st Class track able service which is emailed to the customer on the day of dispatch.
For full delivery details please see our Delivery Page

International Delivery

Hargroves Cycles delivery all across Europe. Goods are shipped from the UK and are subject to import duties where applicable

For further delivery, pricing and restriction information please view our International Shipping Page

Returns Information

We will happily exchange or refund any item purchased at Hargroves Cycles within 365 days, except gift vouchers and personalized products, except where faulty.

Returned goods must be unused and supplied with their original packaging, unless faulty.

For full details on our Returns procedure please visit out Returns Section.

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ROTOR Bike Components comes from one of the nerve centers of technological development in Spain, the Aeronautical Engineering School of Madrid.

The basic idea of the ROTOR System comes from this school where some students developed the initial prototype in 1995. After the Head of the school approved the project, the University's Manufacturing Department helped with the creation of the prototypes.

The designers decided to stablish a company to complete this product development and start a business venture.

After the first working ROTOR bycicle wass introduced internationally, Dr. Conconi showed a huge interest in the idea and asked for a bicycle to carry out a study on the performance of the system, concluding that the system provided advantages more than evident compared to traditional crank systems. Dr. Alfredo Cordova, from Valladolid University also found that later versions of ROTOR System provided biomechanical obvious advantages.

  • Rotor REX 2.1 Chainset