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Single Chainring. Смотреть видео: 1x Single Chain Ring Bicycle Drivetrains View This Before Conversion Or Buying, How To Upgrade To A 1X11 Or 1X12 Drivetrain The Ultimate Single Chainring Conversion Guide, Do You Really Need A Front Derailleur Is 1x Better Than 2x, Everything You Need To Know About 1x 2x 3x Cranksets.