I've got some o rings missing and some stiff spots in my chain, and its the original stock chain, so its time for a replacement. Let's hear what you guys have all got. I'm going to go for a 525, as I do some street riding and that 1-2HP increase and weight decrease is negligible for my needs. Also it last much longer (20k+ vs 520 - 7-8k). Just wondering what you all run / recommend!

Chain Brand:
Chain Model:
Chain Size
Type of riding:
How long it lasted:
Clip / Rivet:
Subjective Comments:

Like RK, DID, O-ring, X-ring, 530, 525, 520, etc., track days, racing, street, etc.