I have a 04 1k and I need to replace the front sprocket cuz of shark tooth effect. I was going to go with a new 525 chain and 16/41 sprockets. I talked to my local Suzuki dealer and he suggested switching to a 520 chain and sprockets. He said there was very little difference in the strength and the 520's were much more common and cheaper to boot. My question is: Has anyone tried this modification and what are your thoughts about sprocket/chain wear and longevity.