I use all 10 in my middle ring and I don't get any chain rub as long as I use my front derailleur trim. But I'd say I spend most of my time in the middle ring. Then, like you, I go into the big or little rings when needed. I find the middle ring to be the most versatile for this terrain, but I would never give up my big or little rings. My assumption would be that it's fine to use all 10 in the middle ring as long as things aren't rubbing. I've been using my middle ring like this for 3 years and I haven't had any trouble. But I could be wrong about this...however where I ride, I'd be shifting between chainrings constantly if I wasn't using all 10 in the middle.
What groupo do you have? I have Ultegra on my current bike and shifting between the chainrings is great. I had Tiagra before and I had to coax it and baby it to avoid dropping the chain. I had to make sure I'd moved the chain far enough one way or the other in the back before I tried to change chainrings up front or I'd drop the chain every time.




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