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While all the dial gauge ones mentioned are great gauges, and I have several, some dial-types can be a bit fragile internally. Believe it or not, this is one of the very, very best I have found over the years...
http://www.harley-davidson.com/store/tire-gauge-tread-depth-indicator-with-braided-stainless-steel-lead
And a little shopping around you can find one for about $20 to $25 bucks. It is mega-tough, consistent, and has a truly *GREAT* 90-degree chuck on the end of the hose designed for use with motorcycles. It's the one I get out of my shop toolbox when working at home.
But while guages like that are great around the shop they're a bit too cumbersome and heavy to carry around on the bike. Some have mentioned various digital ones like the ones from "Roadgear", and while these work great if they are never dropped or have a good battery, if you're ever out on the road and pull one of these out and find the battery dead you'll never carry one on your bike again... Ask me how I know! ::025::
IMHO there's really only one tire gauge worth carrying on your bike - the Milton S921...
Don't confuse a quality Milton tire gauge with any other cheap pencil gauge like a "Slime" one, etc. They're not even remotely similar. You need only pick a Milton up in your hand to feel the difference, and actually using one only reinforces that fact. They work flawlessly, are tough as the Super Tenere itself, and are consistently accurate for *DECADES*. And as a bonus, Milton tire gauges are "Made in the USA". The Milton S921 reads from 5 to 50 PSI in one PSI increments (and 40 to 350 kPa, too) and the chuck fits firmly and securely in the valve stem. I rarely, if ever, lose more than the most infinitesimal amount of air, if any, when checking my tires... And it works great on the Super Tenere's rims.
I get mine from this outfit -
http://www.jbtoolsales.com/milton-s921-passenger-tire-gage-50-psi/
They ship fast and have great prices on lots of tools, but you can find Milton tire gauges at lots of other vendors, too.
The Milton S921 is what I carry on my bikes, and I carry nothing but Milton's in my cars as well.
Just FYI...
Dallara
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