![]() ![]() While it’s possible to put in higher pressures than described above, 90psi is ambitious, and if you ride with tyre pressures much higher than I do, this might not be the pump for you.Īny mini pump is a balance between size (and weight) and usability. ![]() While I'm willing to believe this is theoretically possible if you're trying to prove a point, you certainly won't need to go to the gym for an arm workout after. Topeak reckons the pump will deliver a maximum pressure of 90psi (6 bar). > How do you choose the right tubeless tyre pressure? If the beads have popped, you're going to need a CO2 inflator as the HV setting isn't high volume enough to pop the beads back on again. Which means that hopefully the beads haven't popped and you're inflating after the tyre's either sealed by itself or with the aid of a worm. As this pump has 'gravel' in its name, I'm going to assume that, like me, you're running tubeless tyres. While it's all well and good counting strokes in the workshop, I reckon it's worth taking all this with a pinch of salt. If I was out on the road and didn't have a gauge, I would have called it good earlier to finish the ride. The 37mm Sport Contact tube tyre required 75HV + 200HP to get to 53psi.įor reference, these are the pressures I would put in with a floor pump at home. The 43mm Panaracer Gravel King SK needed the same number of strokes to get up to 40psi, while the 25mm Schwalbe One needed 50HV + 150HP to get up to 60psi. > Puncture repair: learn how to fix a tubeįor a 35mm Schwalbe G-One Speed, 50HV + 250HP gave me 50psi. It's not impossible to put in more, but this is where I reached the sort of tyre pressure I'm happy with, so I couldn't really see the point in adding more. At this point again, pumping becomes a bit harder. Another 200-250 strokes then gets bigger-volume tyres up to workable pressure. My conclusion is that you have to swap from HV to HP mode after around 50-75 strokes, when the pumping effort becomes a bit too much. For the sake of completeness, I also tried a tubed tyre, a 37mm Continental Sport Contact. I tried a variety of 700C tyres, from a 25mm Schwalbe One to a 43mm Panaracer Gravel King SK. The idea is that you fill a bigger-volume tyre more quickly by pumping in HV mode until the effort becomes too hard, and then you top up to the required pressure in HP mode. According to Topeak, the HV setting delivers 71cc per stroke, and the HP setting 25cc. On to the two-stage bit then: at the bottom of the barrel, there's a rubber knob that you twist between a high-pressure (HP) and high-volume (HV) setting. ![]()
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