Standard thickness butyl tube, suitable for 650B / 27.5" wheels. The MTB world hasn't sorted out a standard way to define this wheel size yet - some even refer to it as the Goldilocks wheel size: Not too big, not too small.
Recommended for tire casing sizes up to 2.5". The 48mm Presta valve stem works well with deeper rim depths common on some MTB rims.
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