Depends on the situation - although you did say usually.MR_GRUMPY said:A bike built up with Sora components is usually not worth upgrading, while the old components still work.
Ride the bike into the ground until you wear the components out. Then get a higher quality bike, with "better" components.
Would you put a $1000 sound systen into a $2000 used car?
^ ^ ^ ^simonaway427 said:As others have mentioned, any reason for upgrading your Sora? Is there something wrong with it? Don't like the thumb shifters?
If its the thumb shifters, you can find plenty of 9 spd paddle shifters on ebay that are perfectly compatible with what you have.
Otherwise, stick with, and enjoy, your Sora gear until it wears out. Then upgrade.
Hooben said:Get familiar with SRAM before you swap out, it's very difficult for some to get used to. Everything I've heard points to it being a little expensive to upgrade components. Many will just buy a new bicycle that is set up the way they want it instead of upgrading. Try to shop online or from somewhere that might allow you to save a buck or two.