Recently we changed from 28 front and back to 23 front and 25 back. We like the way the tandem rides particularly while cornering. The other night while getting ready to start what was intended to be a two hour ride in the dark we noticed a low pressure front tire. After four new tubes, don't ask me, what usually take us about 5 minutes tops, became a 1 hour ordeal that almost derailed our outting. We are used to not needing tire levers for mounting our tires but with the cold fingers and tired hands we had to use them. We wanted to pick the brains of experinced riders to possibly learn a few tricks while mounting a stuborn tire. Thanks for your help.