Originally Posted by
fietsbob
Consider Thorn resistant tubes .. heavier because they have 4X as much rubber in them, but are molded to have most of it towards the road.
Good idea.
The city jet tires look to be heavy/rugged and already have a kevlar layer of some sort. Have read too many stories of liners causing problems.
Would really help if you could figure out what is causing the flats.
Routine close inspection of the tire surface can help find stuff that has embedded itself into the rubber and which can be picked out before it gets further down.