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Key Features
One Crankset. Every Rider. Every Trail.
Adjustable Crank Length
Easily switch between 145mm and 175mm crank lengths in 5mm increments to optimize your ride.
Lightweight & Durable
Precision-machined from 7075 aluminum, ensuring the perfect balance of strength and weight for any trail.
Universal Compatibility
Fits all modern Boost frames and works with standard 3-bolt direct mount chainrings for seamless integration.
Find Your Perfect Fit
With adjustable crank arms from 145mm to 175mm in 5mm increments, the JX7 is a true one-size-fits-all solution. No more second-guessing crank length—experiment, fine-tune, and find what works best for your riding style.
R Theory Cycleworks
JX7 Adjustable Length Crankset
JX7 Adjustable Length Crankset
Regular price
$226.00 CAD
Sale price
Starting at
Unit price
per
$226.00 CAD
Regular price
$305.00 CAD
Shipping calculated at checkout.
Unlock the perfect fit with the R Theory Cycleworks JX7 Adjustable Length MTB Crankset—one crankset that adapts to you. Designed for strength, efficiency, and ultimate versatility, it’s built to take you up the mountain and back down with confidence. Pre-orders are now open for mid to late April delivery—secure yours today!
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Explore the Standout Features of the JX7 Crankset
The JX7 Adjustable Length MTB Crankset is engineered for riders who demand versatility, strength, and precision. Whether you're fine-tuning your ride, maximizing efficiency, or sharing your bike with different riders, the JX7 adapts to your needs.
R&D Process
