You can determine what hub you have by checking the end caps

Cons: Not suitable for brakes that take Mineral Oil

2mm square drive - nominal 6mm outer diameter

By threading in to your crank

Material: They are stainless spokes

Shimano SLX SM-CRM75 Shimano Direct Mount Chainring - Shimano Direct Mount - Round - Black - Grey - 34T Images Uploaded - Ready for Review You can determine what hubThe SLX SM CRM75 chain ring uses the same direct mount system as XTR and also features Dynamic Chain Engagement. With a narrow wide tooth profile, it provides excellent chain retention and less chain vibration even on bumpy trails. Who's this item for: Designed for all riders using Shimano 12 speed direct mount cranks and Shimano 12 speed chains. Number of teeth: It is available in 30T 34T options. Mounting style: Mounts using Shimano's Direct mount