Yes, the XX1 crankset will fit, it's the crankset supplied for ultralight models, but be warned there are several constraints to be aware of when choosing a crankset. One of these is that the chain runs very close to the swing arm tube. Consequently there are limits to the largest sprocket and chain ring combinations that can be fitted without the chain starting to saw through the swing arm. The rear changer should also fit but you should contact Helix directly for detailed clarifications. It may take several days to get a response. You can see some of the ultralight derailleur component details if you go to Helix.ca and click on "Order" then "compare".