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Originally Posted by gtfpv
to be honest i have nothing to compare it too , i've done 750kms though over 3 months , and the sora gears have copped a hiding , i dont think they like changing under hard powering up a hill tend to jump a few teeth on the back cogs if you do that, but everywhere else they are fine ,and dont miss a beat, i change them all the time to maintain my speed and cadence , anything better would have to be good .
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Sora is fine for most people (including me) the only benefit most people will get from upgrading to ultegra and dura-ace is bragging rights really.. Sure they'll be a bit lighter but are you going to notice that when starting out? Probably not.
My bike came with sora groupset and I replaced the cranks with Ultegra ones, did I notice the difference? Not at all. Are the shineyer and look nicer? Sure.
As far as changing gears under load goes, no gear is going to do that well. You need to be in the right gear before heading up the hill.