The pro is based on the kr 451 slick, it has much better edge grip vs the GPA. The 212 has a very different front sidewall...completely different than the U.S. tires. Some people say they can't tell where the limit is on the 212 front. But I've had others say they like it. Overall, more people ask for the US front vs the 212....I don't normally carry any 212's.