The Surly Lowside Frameset is the perfect evolution of your childhood BMX bike, designed for riders who crave versatility and durability. Whether you're carving through singletrack trails or relaxing outside your favorite pub, this frameset delivers a unique blend of rugged performance and laid-back style. Built as a singlespeed mountain bike, the Lowside continues Surly’s tradition of simplicity and strength, making it ideal for riders who appreciate a straightforward, no-fuss ride. Featuring modern trail standards such as dropper post compatibility, a 44mm headtube, Gnot-Boost rear spacing, and thru-axles, the Lowside frameset offers excellent adaptability to current mountain bike components. Its design accommodates both 26 x 3" and 27.5 x 2.8" tires, allowing you to customize your ride according to your preferred terrain and style. With compatibility across most mountain bike standards—except rim brakes—this frame is a versatile foundation for your next build. What It’s Good For Riding singletrack trails with confidence and ease Building a custom singlespeed mountain bike with modern components Enjoying a reliable and durable frame for casual cruising or aggressive riding Using as a versatile parts bin bike with wide compatibility What It’s NOT Good For Riders who require rim brake compatibility Those seeking multi-gear mountain bikes Riders who prefer road bike geometry or performance Frequently Asked Questions Can I use rim brakes on the Lowside frame?No, the Lowside frameset is not compatible with rim brakes. It is designed for disc brakes only. What tire sizes does the Lowside support?The frame can accommodate either 26 x 3" or 27.5 x 2.8" tires, giving you flexibility based on your riding preferences.
