Perfect Bike Tire Pressure gauge
thingiverse
Place this over your rim, get on the bike with air-filled tires that are too full. Have your assistant let air out of the tires until the gauge touches the floor exactly. Your tires will now have a 15% drop in pressure. You'll be amazed to discover you've been using the wrong tire pressure all along. This method only works with 29x2.6" Schwalbe Nobby Nic tires and Easton Arc 30 rims.
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