Total newbie to the world of road biking. I went on my first road ride today and rode 47 km. I'm riding at an average speed of 24km/hr. The LBS told me to ride around a cadence of 90. According to my trip computer, I'm riding around 64. I tried to speed up the cadence, but it was killing me. It felt totally unnatural and awkward. Its comfortable for me to ride with the cadence of 60-70. So now I'm wondering what speed and cadence I should be riding at? Today's ride was a mix of hills and flats (more flat). As this was my first road ride, it was also my first experience riding clipped in. After about an hour my right foot got tingling and kinda numb and then the left foot started feeling numb. The bike shoes feel like they fit. I kept riding but unclipped the shoes and the numbness went away. I'm thinking I must be doing something wrong. Anyone else have these issues?