Heavy But Effective .. the rolling resistance is not too bad when up to pressure But it lets you know when your Psi Drops

Made a 10 Month Tour of western Ireland and Scotland without a Flat tire in '97... It was Fine, I was Not in a Hurry.

They're in Both My Bike trailer wheels and My Bike Friday too ...

Though for air retention Im favorably Impressed with the Schwalbe A/V 4 tubes I Got for my Brompton.