Trek Marlin this is a great trail bike. This Marlin has a 21 inch frame and 29 inch wheels and is great for on the trail on the street. Great for single track. This bike just got a tune up 2 days ago!SR Suntour XCM w/mechanical lockout, preload, custom G2 Geometry w/51mm offset, 100mm travel! This bike is LIKE NEW condition and has been well taken care of. Great bike overall. This would make a great Christmas present!