Panaracer Fire XC Pro Mountain Bike Tire. Introduced waaaay back in the 90s, the Panaracer Fire XC Pro mountain bike tire just keeps coming back, year after year. That's got nothing to do with nostalgia, by the way, and everything to do with the way it keeps on dishing out performance and value. Its blocky profile and side knobs look a bit odd when compared to the latest tread designs, but they're just as good at rolling fast, hooking up in the corners and gripping everything from hardpack to loamy trails as they ever were. They work, they last, and they're priced right. With all that going for them, these iconic Mountain Bike tires won't be going away any time soon.