In article ,
Chris Janus wrote:
My first question is, the OCR 3 uses
Shimano Sora(I know, pretty much crap). Can I upgrade this to Shimano 105
or Ultegra? Second, is it worth it to upgrade the components or should I
look at a new bike? Thanks for all responses and opinions.

Sora isn't that bad, as long as you keep it clean and lubed.
Upgrading may be worthwhile if specific components are worn out.
Upgrading the whole thing will be expensive; better to just
buy a new bike.