You’re railing that descent, nailing every line and feeling like a world champ, when suddenly you smash a wheel into a big square-edge rock. Quite literally, you can feel the air go out of the ride.

This might seem elementary – almost not worth mentioning – except for the fact that many riders (myself included) have been running tires designed for use with tubes without tubes many years. There’s ...

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 ...