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X2 RD is the chainring designed for those who demand the maximum: lightweight, stiff, and capable of transferring every watt with absolute precision.
The R81 is designed for Ultegra 8100 cranksets with three dedicated configurations: 50, 52, and 54 teeth, while maintaining the same design philosophy.
Both are compatible with Miche R12 inner chainrings as well as original Shimano ones, giving riders different setups.
The essence of this chainring lies in its meticulous engineering and the incredible attention to detail we have always put into our products: a CNC-machined AL 7075-T6 aluminum plate merges with a structural 3K carbon layer, creating a unique synergy that delivers extreme stiffness, lightness, and top-level responsiveness in power transmission.
Specifications
- Weight: 126g
- Speed: 12cx
- Material: Carbon and AL 7075 T6/CNC
- PCD: 110
- Holes: 4
- Compatibility: Shimano Ultegra R8100
Every Watt Matters
- With X2 RD, it’s not just about pushing harder: it’s about maximising every single watt you produce, transforming energy into speed, and feeling the difference with every pedal stroke.
- Every watt saved is not just efficiency: it’s time, it’s performance, it’s results.
Please be aware that images and descriptions are usually supplied by the brand / manufacturer and are in no way affiliated with Cycle Centre Congleton Limited T/A CycleStore. We only resell items from third parties and do not design or manufacture any products. Product information is compiled automatically from supplier data and occasional errors can occur — if a detail such as size, specification or price looks incorrect, please contact us to confirm before ordering.
| Order Value | Service | Estimated Delivery | Cost |
|---|---|---|---|
| Under £39.99 | Royal Mail Tracked | 2–3 working days from dispatch | £4.99 |
| £39.99 and over | Royal Mail Tracked | 2–3 working days from dispatch | FREE |
| Any order — Express | Royal Mail Tracked 24hr / Parcel Force 24hr | Next working day from dispatch | £6.99 |
| Bikes | Parcel Force 48hr Signed For | 2 working days from dispatch | FREE |
Delivery times shown are from dispatch, not from the point of ordering. As we source products from a range of suppliers, lead times can vary — please check the product page, your cart, or your order confirmation for the most accurate estimate for this item.
Some remote UK postcodes (Highlands, Islands) may carry a courier surcharge on larger orders — we will always contact you before applying any additional charge.
Questions? Email sales@cyclestore.co.uk with your order number.
