The Principia Mac B Retro Mountain Bike is a high-quality aluminium bicycle frame designed specifically for mountain bikes. With a wheel size of 26 inches and a frame size of 18 inches, this frame is compatible with mountain bikes and offers a sturdy and durable option for off-road cycling. The retro design adds a touch of nostalgia to this modern and functional bike frame, making it a stylish choice for cycling enthusiasts looking to build a custom mountain bike.
