Challenge reshapes Gravel Grinder into vastly improved tire, new road hookless tubeless Criterium RS
Much like the gravel discipline itself, Challenge’s popular Gravel Grinder is a tire spilled over out of cyclocross. But while it was a literal cut & paste of straight-line speed & grippy cornering, now it refines the transition to create a more versatile, much more predictable gravel bike tire. Back on tarmac, Challenge adds an
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