I bought the Ti 2 sprockets front and back, Plus the Smart chain 2, for my dads completely stock XR 400, that he rides around the ranch ever day nothing crazy just putts around all day. The sprockets are guaranteed for life to never wear out and if they wear out you get a FREE replacement of sprockets, The chain has a 1 year warranty to replace if it wears out! Well I bought it all june of 2010 spent 480 dollars with them, The sprockets wore out, So i called them for my free replacement, and they told me I had to pay 20 dollars each to replace the sprockets! The chain is also shot and they told me that I have to pay 89.99 for a replacement of another chain. I told them to go jump in a lake. They do not stand by there words, or warranties, and there products are way over priced and do not hold up. I will never do business with them again.