It's important for many reasons, paramount of which is safety that your tires have the correct amount of air/ nitrogen in them. Months of storage can really decrease the pressure. We put our bikes on the Hydraulic lift yesterday to service them for the rapidly approaching riding season and instead of 36 front and 41 rear called for, they both were +- 24 psi front and 34 psi rear! We'd already put about 400 miles on them before checking them on just 2 or 3 small rides so we felt safe but then again who knows????