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  • Rotor REX 1.1 Cranks
  • Rotor REX 1.1 Cranks 3/4 Front
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  • Detail Images - 3/4 Front
RotorREX 1.1 Cranks

Temporarily Out Of Stock

Item # RTR000G

Don't get too bummed. This item is on the way and will be available for purchase as soon as it rolls into the warehouse.

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Rotor has devoted itself to a new line of mountain bike cranks it's calling "REX," and they are based on the same successful Trinity Drilling System as all Rotor cranks. The REX 1.1 is for a 1x drivetrain.

The Trinity Drilling System (TDS) is a method of hollowing out the cranks, which reduces weight and maximizes stiffness. Unlike traditional hollow crankset design, the Trinity Drilling System drills three channels from the pedal to the spindle. While these holes remove excess material, they also leave behind two thin walls, making them stiffer than the design of a single hollow chamber. The TDS creates a maximum strength-to-weight ratio, and the arms were constructed using a new 7055 alloy, which is both lighter and more durable than the more often used 7075.

UBB30 & UBB24 axles ensure maximum frame compatibility. Without the bottom bracket they weigh in at 489grams. The Q-factor is 163.

  • Light and reliable cranks that refine alloy construction
  • Trinity drilling system sheds material and weight
  • CNC machining provides immaculate and accurate results
  • Two thin inner walls elevate stiffness for snappy power
  • Crafted from 7055 alloy for a lighter, more durable build
Tech SpecsWeight
Tech Specs
Arm Material
7055 Alloy
Arm Length
170 mm, 172 mm, 175 mm
Bolt Circle Diameter
BB Type
BSA , BB89 , BB92 , PF30 , BBRight
30mm, 24mm
Q Factor
Compatible Components
Rotor QX1/No-QX1
Recommended Use
mountain biking
Manufacturer Warranty
1 year

Claimed Weight

Claimed weights are provided by the vendor.

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489 g

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Unanswered Question

Would it be able to unscrew the spider from the crankset to use it with direct mount chainring system

Unanswered Question

I have a Rotor inPower left side only power meter. I was using it on my road bike with 3d+ drive side crank arm. Could I use it to attach to the drive side of this mountain crank if I wanted to use it on a 1x mountain build?

Unanswered Question
Avg. ride time: 9h 36m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Would I be able to use these cranks on my Trek Boone?

Unanswered Question

I have a pf 92 gxp bb how can I choose a 24mm spindle when ordering a rx1 crank.?

there is no option to choose between a 24mm spindle or a 30mm spindle.

how do I know for sure that the rx1.1 crank that i'm ordering comes with a 24mm spindle and not with a 30mm spindle?

this crank is compatible with BSA (68 & 73), BB86, BBB89, BB92, BB30, and BBRight bikes. if you want to email me at I can help you out on compatibility with your frameset.

Is this compatible with other PF30 Bottom brackets such as Chris King, Enduro, or Wheels Manufacturing?

Yes the King or any other PF30/BB30 BB will work with those.

Unanswered Question

What's the BCD? Spider looks *maybe* close...

What's the BCD? Spider looks *maybe* close to XX1? What about ring availability or cross compatibility if it is a 76 BCD like XX1?