These are the only tires ill run on my bikes. They wear very good, hook up great, and are easier to install than the mx51's. Their performance is similar to to starcross, but they last much longer. I've tested these tires back to back with mx51's, and they are hands down better tires. It seems like they are made of a softer rubber than the 51's, but have more blocks. Buy them, you won't regret it.