I ended up taking the 58. Wow I absoutely love the bike. First run on the new bike I averaged 22.1mph. Record on old bike was 20.6.

Now I warmed up well, ate a little food, which I usually don't in morning, and was really excited about getting on new bike. So some things on plus side. Negative side it was really, really hot, really windy, helmet was slipping a lot. I would expect to increase this to 23mph and maybe higher. Plus road alone with no one pushing me.

I am excited to spend the 3+ hours working with the LBS on fitting to increase wattage.

I am going to go back to LBS today and see if I can get the R10s switched with R20s.