Riders who use Apex care most about having fun on their ride. This can include off-road rides and gravel excursions. For taking on that type of challenge, you need a strong and reliable chain to keep you moving. The Apex 12-speed chain comes with a distinct flattop profile allowing for a narrower chain, quieter operation, and increased durability. The PowerLock system. It is also lighter than its predecessors. The Apex Flattop chain is one that you can count on regardless of how you ride.