Yokozuna Down Tube Shifter Boss Mount 28.6/31.8mm
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$5.00 shipping within contiguous U.S.
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Allows bicycles without downtube shifter bosses to run downtube shifters.
• Clamps to 31.8mm or 28.6mm downtubes.
• Clamp and shims are aluminum.
• Threaded bosses are steel.
* Anodized black