Hey there!

My bike was stolen not very long ago, so my insurance company decided to replace it with a Scott Sportster 40. I like the frame, tires, brakes and fork, but I feel that the derailleurs are wayyy too cheap. So I'm looking to upgrade both the front and back derailleurs!

So I have these three questions:

• What derailleurs are compatible with my Scott Sportster 40? I'm looking for a high end upgrade, something like Altus, Sora or 105. Click here for full specs
  
  
• What is the difficulty of changing these? Will I need any special tools?
  
  
• How much would upgrading the derailleurs benefit me? I bike 22 kilometers per day, mostly on asphalt but I ride on gravel/mud/dirt around 25 kilometers a year, without any big bumps.
  
  Stock rear derailleur: Shimano Acera RD-M390
  Stock front derailleur: Shimano Altus FD-M370
  
  to
  
  Upgraded rear derailleur: Shimano 105, Tiagra or Sora
  Upgraded front derailleur: Shimano 105, Tiagra or Sora
  

Thanks for reading