The front Schwalbe tyres we supply are 12 x 1.95
They are a superb front tyre for the C5, and have yet to present any problems in the two years I've been using them - including 64miles in one day for the 2007 London Brighton run.
They are also the tyre of choice for Chris Crosskey who over the years has covered 15,000 miles on his C5.
So I'm quite confident they are up to the job