2025 Giant XTC SLR 29 1 Mountain Bike The 2025 Giant XTC SLR 29 1 Mountain Bike is part of Giant's XTC series, which is known for its lightweight and efficient cross-country performance. SPECIFICATION FRAME ALUXX SLR-grade Aluminum, 12x148mm thru-axle BB Standard: BB86/BB92, 86mm, Press Fit Tire Clear..