Nashbar Grinder Mountain Tire 26, 27.5, 29. The Nashbar Grinder mountain bike tire has some of the chunkiest, fattest, most aggressive tread we've ever encountered. If you're all about tackling some super steep, rocky, root laden trails, this all mountain, all weather tire delivers the goods. Exceptional traction, exceptional ride quality, and exceptional durability make this tire a winner. And with Nashbar Grinders available in 26, 27.5, and 29 sizes we've got you covered no matter what wheel size you prefer for your off road adventures.
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