The beauty of the Hollowgram system is that every part is interchangable. Not only can you use the same arms on your road and mountain bikes, but you can swap out whether or not you want to run a single, double or triple at a whims notice. We stock every variant, and all of the subsequent parts needed to complete your hollowgram system. If you have any questions regarding fit or compatibility, please feel free to contact us anytime.
- Compatible with Shimano double or triple
- 104mm / 64mm BCD
- 4 Bolt Holes