also depends on what you are riding on. meaning pavement, hard dirt, crushed stone, softer soil based surfaces & or with or without a layer of fresh precipitation, maybe even snow? but for pavement, as mentioned above max in the rear is a good place to start, with 10-20 lbs less up front. you can feel free to use your pump's gauge, tire pressure accuracy isn't critical. trial & error will help you decide your preferred pressure(s). been experimenting with mine & the past year or so been surprised how low I can go with the front tire, especially on unpaved surfaces