- Premium 2X Cannondale compatible rings are designed for the Hollowgram crank family including SI, SISL, SISL2. Sold as a set only
- Rings are machined separately, then connected together before directly mounting to the crank as one
- Incredibly stiff and light with super fast shifting thanks to a patented shift ramp design
- Oval rings help the rider to spin smoother and more efficiently
- Works with 2x chainring systems and does not require any modification to the front derailleur for use
- Designed in UK, manufactured in Poland
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