First one, what could I use to make a back support for my Timbuk2 messenger, it's really annoying having something sticking into your back all the time.
Second, would I be better off putting a grippier tyre on the front or rear to stop me from slipping? My rear lugano is fairly worn and there isn't much tread left so I was thinking of sticking a zaffiro on there for now until I can afford something better. But it'd leave me with 25 on the front and 23 in the rear. Or should I just stick the other zaffiro on the front and put up with the shit ride.