Defy the norms.
The hollow Si crankset, paired with the any SpideRing, is an impressive upgrade for any mountain or road bike.

Where it thrives:
Challenging trails, the open road, up and down hills

What it's built for:
Durability, efficiency

Highlights:
- Compatible with all SpideRings and HollowGram spindles
- Self extracting bolts for easy removal
- 172g/arm including hardware