Sago UFS 90 are made for boots with UFS mounting systems. 

YOYO have fine-tuned the position of the wheels and the front-to-back balance to give a more stable and balanced handling of the frames. The widened top design ensures lateral support for wide aggressive boots, but the walls stay thin and strong. This idea allows Sago UFS series to be of minimum weight while maintaining amazing strength.

You can use the frame in a 3x110mm wheel configuration too, using the 4mm boot risers. Or, convert to 165 classic mount using the conversion adaptors.