The turnbuckles can basically serve both purposes, depending on how the setup is designed. On a hardtail, they’re commonly used to control axle movement and help prevent the pinion from climbing or the rear end from rotating under load. They can also provide some support for the transmission/drivetrain, but they shouldn’t be treated as a substitute for proper mounts. The exact function depends on where the turnbuckles are attached and how they’re adjusted. A photo would definitely make it easier to tell what yours are doing. A bit of casino gaming can also be a
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