If your bike has Presta valves on its rims or tubes, you'll know that pumping the tires can be a fiddly business. The Zilch floor pump is claimed to address that problem, with head seals that don't ...
Tubeless mountain bike tires certainly improve on their conventional counterparts, but could they perform even better? The OPTIS insert is claimed to help them do so, by serving as an inflatable ...
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