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Shimano Dura-Ace SG chainrings _ (January 1991)
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Dura-Ace 53t chainrings _ New-In-Package
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Dura-Ace Chainring _ Retail package card
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SG chainring instruction brochure
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SG chainring instruction brochure
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Dura-Ace 53t chainrings _ Beautiful finish
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Dura-Ace "SG" (Superglide) chainring
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Dura-Ace 53t "SG" chainring (January 1991)
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eBay listing (January 2019)
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Seller's description
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New Dura-Ace SG chainring _ on FC-7402 crankset
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Dura-Ace crankset (FC-7402)