The Surly Ultra Light Fat Tube's name is cryptic, obfuscating the true use and nature of a very complicated artifact. You may not guess it at first, but the Ultra Light Fat Tube is a butyl tube with a presta valve for use with fat bike tires. And it's light compared to other tubes designed for similar applications. The Surly Ultra Light Fat Tube fits 26" tires from 3 inches to 4. 8 inches.
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Surly Ultra Light Fat Tube
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