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Monday, August 10, 2020

Review: Topeak Smart Guage D2

I've been making do with the gauge on various pumps in the house for ages, and relying on feel to decide how high to pump up the tires. Mountain biking with kids, however, requires much more tuning of tire pressure than for adults: kids can ride tires with as little as 15psi, and I always wondered if the gauges on the pump were accurate. So I bought a Topeak SmartGauge D2.

It's not a particularly cheap one, but it is fairly well regarded, and has a nice switch that flips between presta or schraeder modes. It also uses a CR2032 battery, which ties in nicely with all the other CR2032 driven Garmin sensors in use on various bikes.

The device seems much better for schraeder than presta valves. The valve will leak more than a little if you're not spot on when using it on a presta vale. The ergonomics otherwise is great: the unit will beep when it's done, and there's a bleed valve so you can bleed down the pressure.

I discovered of course, that my floor pump (a $20 Bontrager purchased in 2008 when I was in Munich) over-reads pressure, and when it reads 90 psi, the D2 reads 75. That's good to know --- it means I have extra headroom on tire pressure on the triplet, which will become necessary as the kids grow heavier.

It turned out that I also really didn't need the gauge. When I used it on my kids' bikes, it read 14psi! So my thumb was already well-calibrated to what my kids needed, even if my gauge wasn't. But that's also worth knowing --- if I'd been off, I wanted to know, and given that my thumb is accurate, I also now have the confidence to do without a gauge most of the time as well.

Recommended.

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