"This is no garage-only experiment. Doug has secured patents in the U.S. and Europe, has years of prototypes behind him, and some very real test data pointing to a new way of turning watts into speed. We tested some of his earlier work, and now that he's refining his design, we thought it would be the perfect time for an interview."
"The Spreng Reng chainring stands out for its patented quasi-hexagonal shape, a design registered in both the U.S. and Europe. Unlike traditional oval rings that only improve efficiency through the dead spots of the pedal stroke, the Spreng Reng claims to enhance performance within the power stroke itself. This unique geometry reportedly achieves a 50% reduction in friction from chain-link stiction, a 50% intermittent reduction in articulation friction, and a net torque increase without compromising gear speed."
Doug Brown Jr. developed the Spreng Reng, a patented quasi-hexagonal chainring registered in the U.S. and Europe. The geometry targets power-stroke efficiency rather than only dead-spot mitigation, reportedly cutting chain-link stiction by 50% and intermittently reducing articulation friction by 50%, while increasing net torque without altering gear speed. Independent testing recorded a 26-watt increase and a 5% faster climb using a 36T Spreng Reng versus a 34T round ring. The design produces a smoother, more fluid pedal stroke and easier climbing cadence with no adaptation period. Prototyping began in 2016 and the current version is presented as a refined final iteration, with potential uses across road, gravel, MTB, and Hour Record pursuits.
Read at Bikerumor
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