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Only guessing, but the Asian community's unfamiliarity with the SAE system would imply that 1.4 means 1.4", as measured by a caliper. Just a hair over 1 3/8".
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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