PUSH Industries ACS3 Coil Component Kit – 2016-Current RockShox Yari and Lyrik 170mm. Transform your existing RockShox Pike Lyrik or Yari suspension fork into the ultimate trail fork. The ACS3 coil conversion kit combines small bump sensitivity traction and mid stroke support of a coil with the big hit performance of an air spring. By using coil springs you can eliminate the constant maintenance required to keep your fork running optimally!