Topeak SmartGauge D2 Digital Tire Pressure Gauge – Presta/Schrader Compatible, 250 Psi/17 Bar, Precision Air Pressure Reader with LCD Display for Bikes, Motorcycles & Sports Equipment

When my Toppeak analog gauge finally fell apart after over ten years of heavy use my first thought was to get one exactly like it, but I was attracted to the feature on this gauge which allows you to release tire pressure while reading it as it drops and the fact that it has a single hole head which is compatible with both Presta and Schraeder. Months later, I couldn't be more pleased with this gauge. When I look at the gauge on my Lezyne Alloy Floor Drive Pump as I'm pumping up the tires the gauge on the pump is fairly accurate, but you can't increase pressure by only a pound or three, and you can't decrease pressure with it at all. So when I overpumped the tire--as on most any floor pump--I would have to remove the pump from the valve, take a wild guess about how much air I should let out, and repeatedly use my old analog gauge to check it until it was roughly the pressure I wanted. With this gauge I always put more pressure than I need in the tire, then remove the pump, measure the pressure--which is too high at that point--then press the button to measure the pressure as I use the release button to get it where I want it. This would be a pain in the butt if it weren't for the swivel head on the gauge which allows me to point the display where I can easily see it rather than change the position of the tire or tilt my head to view it. Overall this process has become quicker, easier, and more accurate due to this gauge. And it's a great benefit to other riders when I'm on a club ride or volunteering as a ride marshal in a community bicycle tour that with the flip of a switch I can change between Presta and Schraeder valves without having to take it apart or switch around any gaskets. A lot of people will tell you that you don't need a gauge, that they can tell just by squeezing the tire. That's nonsense. I used to think that until I finally bought a gauge and found out that when my mountain bike tires feel rock hard by the squeeze test they actually have only about 25 psi in them when they should be at least 50 psi, and my road bike tires might feel rock hard at 60 psi when they should be 120 psi. For reference, your car tires only take about 35 psi. And by the way, this is a great gauge to use on your car too. I check the tire pressure on my car at least every month, and more often when the seasons are changing. Sometimes I need to put more air in using the electric pump on my Slime 50051 Safety Spair All-In-One 36 Piece Roadside Emergency Essential Kit and sometimes I need to let out a pound or two of pressure. With this gauge, I don't have to guess how much air to let out when the pressure is too high, checking each tire multiple times until I have it right, or use the needle on the analog gauge to get an approximate pressure reading. Whether on my bikes or in my car, inaccurate tire pressure can mean compromising fuel/power efficiency or traction, and with gas prices what they are these days even another three miles per gallon matters in my car, and incorrect pressure in bicycle tires make for a harder ride and lower endurance. So instead of thinking that maybe this is a little over the top, I recommend you buy it. The price is certainly reasonable and I doubt you will regret it.

This is a very solid, reliable and easy to use gauge that works well for both higher-pressure road bike tires and lower-pressure mountain bike tires, and for auto tires. It works with both Schrader and Presta valves, with a simple, one-click switch to go between these two standards. I really like the large display, which is much easier to read than the tiny display I had on another, older electronic gauge that eventually failed. I also like the swivel head that makes it easy to see the display from various angles. It's got a rugged feel to it (without being too heavy for bringing along on a MTB ride), and is the proper shape for holding it securely while using. It's a great device ... the best tire-pressure gauge I've ever owned. I only have two nitpicks: One thing that's not obvious is how to use the "bleed" or air release button. If you read the instructions, you'll be fine ... so don't toss them! Another nitpick: With a maximum 250 psi, this gauge can supposedly even handle pressure readings on suspension forks and shocks ... but I wouldn't buy it for that purpose. Since this is a press-on, rather than a threaded chuck, you get too much air loss from a shock to get an accurate reading (I tried.)

No external tire gauge can measure tire pressure without some air loss. The is always the case because some air has to get into the gauge in order to make the pressure reading and the gauge can't put that air back into the tire when you remove it, no matter how talented you are. So those claiming to use this or any other external tire gauge without losing ANY air doesn't know what they are talking about. With the Topeak D2 Smart Gauge you can get it to work with a loss of only about 1 psi for a road bicycle tire and a negligible amount for a car tire, when using it with either a Schrader or presta valve. However, as others have observed, it is difficult to consistently achieve this with a presta valve. This is because the pin of the presta valve, unlike the Schrader valve, extends several millimeters beyond the body of the valve so that you must press the gauge on very quickly if you don't want to lose much air. The presta valve opens as soon as the gauge starts pressing down on the pin and the air keeps leaking out until the gauge is fully engaged and seals the air in, so the faster you are the less air will leak. With a Schrader valve the pin is flush or slightly below the housing so you can fully engage the gauge much quicker and with less air loss. To make matters worse, with the presta valve you have to push the gauge down on the pin in a very straight line lest the gauge catches on the top of the valve while the air continues to leak out. This can be very frustrating to say the least and is all the more so if you are trying to check the pressure after fixing a flat out on the road. People can claim all they want that with some practice and good technique they can nail it every time ... just wait until they try this at the side of the road, at night, with fingers numb from the cold. In spite of the problems with presta valves I would have kept the gauge anyway since I needed to replace the gauge I used for the car. I like using it for the car because you can rotate the bottom of the gauge so that it is easy to read the display regardless of whether the valve is at the 12:00, 3:00, 6:00, or 9:00 or any other position. The bleed feature is also useful for car tires (but too fast to be useful for road bikes). It also leaks much less air than my old gauge. But I did want to use it with my bicycles that have presta valves and I found a simple solution – use it with a presta to Schrader valve convertor! This does require a bit more time because you have to screw on and then remove the adapter (well, unless you don't mind the extra rotational weight unbalancing the wheel). I found that with my adapter I had to grind the end down 1.5 mm to bring the presta valve pin close enough to the top of the adapter so that the gauge will open the valve when pressed onto the adapter. Once I did that it works fine and I can get a reading with just 1 psi of loss every time, even under adverse conditions.

Small and convenient to have to know the tire pressure

This gauge is a beaut. I bought the previous version several years ago, but was never really happy with that one. This new model has picked up several improvements and is a lot better. It's now easier to use, and most importantly it takes fast and accurate road bike tyre pressure reading with virtually zero air loss. If you're like me, you can probably estimate the air pressure in a high volume MTB tyre, but that's less critical anyway and the pump is usually enough of a guide for such tyres. However, with high pressure road tyres, knowing the difference between say 70psi and 110psi is less obvious from just squeezing the tyres with your fingers or putting your weight on the bike. Making it worse is the fact that most floor pumps don't have particularly accurate gauges on them, and more importantly... low volume high pressure tyres can very quickly change pressure from even a momentary air loss! The body of this new version rotates, making it simple to take readings without any mucking about or getting down to the wheel level eg. when valve is at the top, just have the gauge display facing up, simple. The gauge now fits better in the hand, and the ON button is easier to use. It takes a single CR2032 battery which fits with less nonsense than before. There is also an added air bleed button and a continuous reading mode, to allow readings while releasing air (with the gauge still attached). I always stick with PSI readings, but bar readings are also available (plus kilograms per square centimetre if anyone wants that). The smart head works well with both Presta and Schrader valves, allowing it to double as a shock or fork pressure gauge. I should mention though, that this is primarily a high pressure reading gauge (max 250 psi) and road tyre pressure readings with Presta valves are quick and leak free. Low pressure in a Presta valve tube will cause a temporary air seal leak when connecting or disconnecting the gauge... but this is NOT a fault, and it will not upset the pressure in MTB tyres unless you have no idea how to use it properly. It's the air pressure behind a Presta valve which seals it and facilitates the nice sealing around this gauge (Schrader valves depend on a spring inside the valve stem, but usually work with lower pressures eg. wheel barrow, car tyre). A sliding lever must be moved to accommodate Schrader valves, which also work just fine. Great product at a fair price, Recommended.

The SmartGauge D2 is an absolute game changer for any performance rider out there. This precision air pressure gauge has become an indispensable tool in my biking arsenal, and here's why: First and foremost, it's incredibly easy to use. The intuitive design and user-friendly interface make checking tire pressure a breeze. Whether you're a seasoned rider or a novice, you'll appreciate how effortlessly you can fine-tune your tire pressure. A tip I suggest is to pump your tires slightly above your desired pressure. Then use to gauge to read the pressure and release air until the desired pressure is shown. This can be tricky at first but after reading the paper instructions, it is a breeze. Accuracy is key when it comes to performance, and the SmartGauge D2 delivers on this front. I've tried several other gauges in the past, and this one stands head and shoulders above the rest. It provides consistently precise readings, ensuring that my tires are dialed in to perfection. If you're a performance oriented cyclist or simply someone who values accuracy and ease of use in a pressure gauge, the SmartGauge D2 is a must-have tool. It's the best I've come across, and I highly recommend it to anyone looking to fine tune their tire pressure with confidence. Five stars all the way baby!

This product is great. It measures the pressure of my tires and shocks with ease and accuracy. It works with both Presta and Schrader valves without changing parts. It has a digital display that shows the pressure in psi, bar, or kg/cm2. It has a rotating head that makes it easy to attach and read. It has an air release button that lets me fine-tune the pressure. The Topeak SmartGauge D2 is a handy tool for any cyclist who cares about their tire and shock pressure. It's small, lightweight, and durable. It runs on a single CR2032 battery that lasts for a long time. It's easy to use and reliable. The only problem is that sometimes I get too obsessed with checking my pressure. It's so satisfying to see the numbers on the screen and hear the beep when it's done. I can't stop myself from using it every time I ride. I even use it when it's not necessary, like when I'm at home or at work. But hey, maybe that's not a bad thing. Maybe I need to be more careful and attentive to my pressure. Maybe I need some fun and excitement in my cycling. Maybe this gauge is the best thing that ever happened to me. If you're looking for a way to improve your performance and comfort on the road or trail, you should definitely try the Topeak SmartGauge D2. It's like having a smart assistant on your bike. Trust me, you won't regret it.

I have been looking a long time for an accurate prseeure gauge for Presta that does not lose air while checking. This is the best I have found so far. It does take a little practice. Once you figure out how to place it and push it on, it works well. I lose exactly one lb of pressure with each check. I don't think you can find a gauge that does better than that. Line it up and push it straight on quickly (but not too much force...just enough). Now for the problem... I was prepared for a problem with the battery after reading other reviews before I bought this. When I opened the package and installed the battery, nothing worked (blank screen). I tried a brand new battery. Still nothing. I was ready to send the unit back! The original battery was fine. I had read a review that had said to remove the inspection sticker that is inside the battery compartment. So, I did and while I was experimenting with the battery again I heard a beep. I noticed that I could move the battery around and hold it in place (without the cover) to get a readout on the screen. So, I cut a small piece of rubber from an old bike tire inner tube and placed it directly on top of the battery (between the battery and the battery cover). I then screwed the battery cover on and everything worked fine. I have not had a quality control issue with Topeak before. Other than this, the unit seems well built and accurate. If it were not for the battery problem, I would have given it five stars. I have a Lezyne alloy drive floor pump with built-in gauge (another excellent product I got through Amazon). The pressure readout is exactly the same on the floor pump and on the Topeak. Since I am pretty sure the pump is excellent quality, this leads me to believe that the Topeak gauge is accurate.