Grinduro winds up and down the beautiful Sierra Nevada Mountains out of Quincy. The course is only 65 miles but make no mistake, you'll have to take your time to finish it and climb all the 8,000 ft. It's a sufferfest with big smiles, pizza and beer! Depending on the conditions of the single-track 40-45mm tires are a good option. Coming down the bigger climb is pure joy and traction is key to leave the mtb's behind in a dust cloud.