I rode 20 miles on Sunday and was getting ready for 10 mile ride yesterday. Before every ride I check the tire pressure and yesterday the pressure in my rear tire was down so, I topped it off and away I went for my 10 mile ride.

Today I am getting ready to load my bike on the car rack because it is going to my LBS for 30 day warranty checkup. The rear tire was completely flat.

I got away with going out on two long rides with a faulty tube with no extra tube or patch kit in wedge.

I won't make that mistake again.

So, for the experts should I buy a mini pump or use CO2? Keep in mind the maximum tire pressure on tires is 80 psi. Finally, a mini pump model or CO2 attachment recommendations would be greatly appreciated.