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A Bike with both 29" and 27.5" wheels to ensure a great fit regardless of frame size, get ready to hit your local trails this summer. Buy the GT Avalanche Sport 29/27.5 Mountain Bike 2020 at SportChek.ca. Sport Chek carries a wide selection of Men’s Mountain Bikes and Women’s Mountain Bikes, including Hardtail Bikes. Free Shipping Credit Available.