I have a Specialized Air Tool Combo2 Pump. I use the CO-2 part mostly but I have the hand pump feature in case I run out of CO-2. The 16 G will pump your 700c 23s to 120 Pounds pretty quick. You will have to top them off in a day or so but mostly you are just trying to finish the ride so it doesn’t matter much. I like the quick fill feature and how easy the CO-2 is on the valve stem. But you do need an option just in case you run out of CO-2. But you can fill a tire to 120 pounds just as fast as you can say 120 pounds.