Here’s the latest product to come out of Flatware line. This new flatland-specific Twombolt crank and Rhode Island sprocket are available now, so hit up your shops and mail-orders to get a set. Click around the flipbook above for pics and read below for details.
New “Socket Drive” Interface
This 9-sided sprocket interface has been designed as a new standard for sprocket fitting. It can be built into the spindle on 2-piece cranks like the Twombolt, or it can be incorporated into the arm on 3-piece cranks.
A new interface seemed to be a necessary development because sprockets have become smaller across the board. On anything less than a 25-T there starts to be a heavy concentration of stress around the drive bolt and the sprocket teeth. Switching to a closer spaced sprocket bolt is one solution, but that also increases the stress on the sprocket as the same torque applied at a closer radius results in a much larger contact force.
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