I've got a 2011 Specialized Secteur Elite with basic sram apex groupset.
It has the following specs: 10 speed 11-34t cassette SRAM APEX 50/34t chainwheel SRAM APEX Currently running 700c with 25m tires
I am looking to upgrade the groupset to either the ultegra or the 105. A majority of my rides are longer (>30miles) that are relatively flat with a few hills.
I'm 6ft and weigh in about 215lbs right now.
What I am stuck on is the gear combination for my new groupset. I want to be able to go faster for longer. Obvisouly my weight plays a role so I am focusing on slimming down:) but i am currently averaging about 17mph on my rides and I want to aim for >20mph.
Based on all of this, what gear combination should I go for on my new groupset to be able to ride faster for longer? 53/39, 52/36, 50/34, 11-28, 11-30, 11-32, 11-34???