Ever consider the possibility of holding your cards for a while? A bike a year with the types of bikes you are talking about is actually a pretty good pace. But, whatever floats your boat. I, with 7 bikes, am certainly not one to talk too loudly.
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Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter