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Some motorcycles are water-cooled

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S1 E-Bike Helmet (NTA 8776 Certified) Style: S1 Retro E-Bike Helmet Colors: Black Matte Size: 52 — 60 cm (ie: 20.5” - 23.5”) X-Small: 20.5", Small 21", Medium 21.5", Large 22", X-Large 22.5", 2XL 23", 3XL 23.5" Trademark: S1® Product Description: Helmet for S-EPAC cyclists About: The S1 Retro E-Bike Helmet is certified to the new NTA 8776 standard and is rated for speeds up to 28 mph

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