Box Components Box One B52 Bottom Bracket

Box Components Box Two 35mm Bottom Bracket

Box Components Two Oversized 30mm Bottom Bracket

Several of the upper-tier Box bottom brackets were engineered using Box Oversized Technology. These were developed in concert with the crank sets. We all know that there is no use pushing hard on your pedals if you can’t deliver most of that power to the rear wheel. During the creation of our bottom brackets, Box were obsessed with Power delivery/pedalling stiffness. To reduce lateral deflection, we chose to oversize the bottom bracket and therefore subsequently enlarged the spindle and the crank arm’s interfaces. This made room for larger bearing rings contributing to a vast increase in contact area. Box removed material from unloaded sections to reinforce the zones of high stress. Not only are you going to be more efficient with power delivery, but you’ll also feel the instant response of acceleration. Seen through another lens, less energy will be required to achieve the same elapsed time.   Key differences: The Box Two M30 bottom bracket is a slightly less acute embodiment of our Oversized technology seen in the M35. Generously sized ABEC-5 bearings help reduce power loss to defection. The larger 30mm cross section is designed to mate up with the rest of the M30 line of Oversized cranksets.

Box Components Two BB Set 24mm

Box Two™ 24mm External bottom brackets feature cold-forged, CNC-machined alloy cups, dual-labyrinth bearing covers, and precision-sealed bearings. They are the perfect match to Box Three™ and Four ™ cranks, and the ultimate upgrade to the budget BBs sold with most cranksets. Box Two™, 24mm External Bottom Brackets, are designed to fit all 24-millimetre crank spindles and frames with 68 or 73 x BC 1.37-inch BSA threaded bottom bracket shells.

Box Components Two Square-Taper Chromoly Bottom Bracket

Box Two™ Square Taper Chromoly Bottom Brackets are the best option for young BMX racers and other users of three-piece cranks in search of an affordable, high-performance square taper bottom bracket. Each bottom bracket is hand-assembled with a Chromoly spindle, sealed bearings, forged and CNC-machined alloy cups, and a composite centre spacer/seal.

Box Components One Bottom Bracket Square Taper Titanium/Carbon

With precision sealed bearings and cold-forged, aluminium CNC machined cups, the Box One™ Titanium Square Taper bottom brackets are the best option for young BMX racers and other users. It is a three-piece crank in search of performance gains and weight savings. They have hollow, custom titanium-nitride-coated titanium spindles and carbon fibre centre seals, helping keep the weight down between 185 and 190 grams (well below that of other square taper bottom brackets on the market). Other features include cups that are anodised black with anodised gold inner seals and a JIS tapered spindle that comes in either 108 or 113 mm.   Features: Precision Abec-5 Sealed Bearings Lightweight Non-Structural Carbon Components Extra Rigid Titanium Spindle