Join Date: Jun 2010
Location: NW,Oregon Coast
Mentioned: 2 Post(s)
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Quoted: 218 Post(s)
so what combination Do you want? 39 is as small as you can fit on 135 bolt circle,
39 is it , so there is a bigger small ring and smaller big ring.
7075 aluminum is good , Stronglight and TA make top notch spare chainrings.
so you will be reducing the wrap capacity required of your Rear derailleur
Cyclocrossers often switch to a smaller big ring, on their cranksets.
the Paris Roubaix racers swap in a bigger small ring.
so it's all fine.