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Optis Tubeless Tire Insert 27.5" x 28 40mm Insert Only PSI 55 it features TriMax® triple insulation Weight 653 it features TriMax® triple insulation and keeps drinks cold up to 60 hours and hot up to 12 hours The thermo moldable fit and women's specific shape ensure a snug feel for ultimate comfort This allows for lower tire pressures while the insert is inflated to a higher pressure than the tire keeping the tire supported while allowing the main volume to be at a lower pressure that provides optimum grip Riders can separately tune the tire's grip and internal support through a dual valve design allowing for lower tire pressures and ride characteristics that would not be possible with a traditional tubeless or foam insert set up
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