crank length is 170. I rode with a fun group last thursday and finished the 17 miles with no problem. On tuesday I am oing to go out with a faster group and peddle like hell until I get dropped. On the bike fit side my legs felt great and I did a lot of coasting while in the group. My only complaint is that my lower back hurt alot. I dont know if that is due to bike fit or poor posture while riding.