K7S produced the professional Fixed Gear bike. WTB Thickslick tires 700cc x 23c tires give you more nimble, zippy and fast with less rolling resistance. You can enjoy the real fun to riding fixed gear bike. for tire durability for skidding, it matters way more what brand of tire than what size tire you put on your bike. The gear ratio is 46:17 with 73.1 gear inches using a silver KMC chain. It comes equipped a flip-flop rear seal bearing hub has a track-type threading with Taiwan lockring and the other side is threaded for a single-speed standard freewheel ( without freewheel ). Many cyclists interested in simplifying consider going to a single speed freewheel as a way to “test the waters” with the idea that if they turn out to like that, they might later convert to fixed gear. But we strongly recommend starting out with fixed gear. If it turns out to be a problem, you can easily convert to freewheel later if you want to. typically takes a couple of weeks of regular riding to get past the strangeness, but then it’s quite addictive! Because the professional fixed gear bike frame , crank , RC length are different from single speed bike. Alloy handlebar , stem, seat post. Available in frame sizes 49cm, 53cm, 56cm. How much assembly do I have to do when I get my bike? All you need are very basic mechanical skills. Your bike will come 85% put together in the box. All you will have to do is put the front wheel on, put the pedals on, the handlebars on and adjust the brakes. What tools will I need in order to put my bike together? You should be able to put everything on with just a number 5 allen key, 15# spanner, and cross screw driver. Net weight:26 lbs Gross weight: 34 lbs