mx_rob makes good points about 520 vs 525 chain. One thing to keep in mind if you think you might take your DR on some very long rides and find yourself in need of a chain somewhere in BFE it might be pretty hard to find a shop that has a 525 replacement chain in stock. For years our shop was the only one in the area (population about 250K) that stocked a 525 chain. We only kept one and we only kept it because none of the other shops did. Seems like every time I sold one of those chains the buyer had already called all the big shops in the area and was already convinced he wasn't going to find a chain. If you are running a 520 chain then just about any bike shop anywhere will have a chain to get you back on the road.