NJSam

I just noticed the other shrader on your apparatus. Yes, that will work nicely. Excellent idea! I may make one myself. Thanks for the idea. Happy trails!

Absolutely right, which is what I'm saying. The air from the tire has to fill the hose and gauge until equalized, and when you disconnect, the tire doesn't get the air back, so it's that much lower each time you check. BTW, the center thingy is called a Shrader Valve, and they can go bad and start to leak. A little soapy water around the whole valve area will show any leaks. Not trying to be a know-it-all, it just hit me as soon as I saw the pic that you would lose a lot of air each time you checked the tire. TP's on bikes are crucial for a number of reasons. Enjoy the upcoming riding season!

Good idea. The only problem I see with this: the amount of air from the tire required to fill the whole hose with air. Easy test: Check tire pressure 5 times, see total drop, divide by five, and you have average drop per check. Remember that number, and you'll know what TP should be after checking once. Or, shorten hose A LOT and don't worry about it. Sorry to be OCD, but bike tires typically hold 1/5 the amount of a car tire, so each check can drop the TP significantly. Peace!