Back in May 2013, Sram announced that it had released the technology for the chainring with the "wide tooth, narrow tooth" scheme under license. For its part, Sram relies on a 1979 patent from the agricultural sector for the chainring that keeps the chain in check.

In December 2013, Chromag and Accell Group (comprising the brands Batavus, Sparta, Loekie, Ghost, Haibike, Hercules, Winora, Raleigh, Diamondback, Lapierre, Tunturi, Atala, Redline) obtained a license from Sram for the "X-Sync" technology on the chainring.

The licensed manufacturers can produce their own versions of the "X-Sync" chainrings and distribute them via their own networks. At the same time, these manufacturers will combine their own chainring with parts from the XX1 or X01 groupsets.

Sram points out in a press release that chainrings in the "wide tooth, narrow tooth" scheme without a license from Sram wear out quickly and should not hold the chain reliably.

www.sram.com