KG - I agree with RnR, doing the extra milage later in the same day is a good option. I think it works very well for still training the endurance that you're looking for.
Can you elaborate on that? How does that work?
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2008 Roy Hinnen O2 - Selle SMP Glider
2009 Cube Axial WLS - Selle SMP Glider
2007 Gary Fisher HiFi Plus - Specialized Alias