This Santafixie brand Wheelset is assembled by hand in our facilities. The 30mm rims are the same ones we ride on our Santafixie Raval bicycles. We have tested those wheels and the results have been excellent. They are high quality wheels but for an economic price.We assemble the front wheel with our branded sealed bearing hub. The rear hub has coaster brake, so if you pull back the pedals the bicycle will be brake. The spokes are manufactured in Europe by the Mach1 factory.It\'s size of 700c, is compatible with all the wheels of road bicycles. The tyres recommended are from size 700cx23 to size 700cx28. You will need a 48mm inner tube. And you need to mount a rim tape between the rim and the inner tube to prevent and reduce punctures..