![]() ![]() US tyre brand Compass points out that an excessively flexing tyre can damage the casing: “You also don’t want to run too low a pressure with tubeless tyres. It also increases the risk of slamming the rim into the ground and damaging the tyre. You don’t want to go too low either because the tyre could collapse under load in corners and squirm horribly. Hunt advises against going above 100 psi with 25-28mm tyres, 70 psi for a 30mm tyre, and 35 psi for over 46mm wide tyres. There’s a sweet spot between the two extremes which you want to aim for. Equally, go too high could also be inviting trouble as the tyre could blow off the rim. ![]() You can’t go too low of course, because the tubeless tyre needs a certain amount of air to keep it mounted onto the rim. You don’t get that energy back when you come down the other side, instead as the rider you are working to absorb that vibration.” The rolling resistance reduction is interesting, and a little counterintuitive with a higher pressure the tyre can’t deform as much over small bumps in the road and the wheel, bike and rider are all bounced up over the object. “Once you can run lower pressures without an increased risk of punctures, then you can get all the benefits that come with that: the obvious ones being increased comfort, better grip from a larger contact patch, but also reduced rolling resistance. When an object like a rock or pothole completely flattens the tyre against the rim, a reinforced tubeless tyre sidewall is much less likely to be damaged than a butyl inner tube, explains Brand Manager Ollie Gray. Without a soft inner tube, the chance of pinch flats/‘snakebite’ punctures is much lower. “Alongside the ability to seal punctures, it’s the biggest reason to consider giving tubeless a go. Hunt concurs with this recommendation and as well as reduced punctures, more comfort, and also points to reduced rolling resistance being another benefit. ![]()
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