well I hate presta valves they allway's caused problems for me so I stick with shraders I've do it before with no problems.. the first fixed ride was fun I was slowing down with my legs and brakes I did get bumped off the saddle a few time and when I went to move position on the seat the peddles gave me a reminder but I just had the tooth done so riding so soon was abit stupid so I headed home spiting out blood that ruined the ride abit but it was alot of FUN too