“What size of nuts are bolts or hex heads that hold that vertical upright handlebars on ?”

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• They are 6mm hex heads.

  Answered by Product Expert 2 years ago

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• They are 6mm - Schwinn Team

  Answered by Schwinn Fitness Team 2 years ago

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• They are 6mm hex heads.

  Answered by JohnM 2 years ago

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• I believe they may be 3/8". Very sturdy and strong.

  Answered by Anonymous 2 years ago

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