Oban is very fortunate in having many great places to to go cycling, suitable both for mountain bikes and road bikes. Mountain bikes are well served with forest tracks and paths and there are single track tarmac roads suitable for all bikes so you can ride from Oban to Connel or Oban to Taynuilt for example along beautiful quiet glens, with plenty of opportunities for whizzing down the hills.... once you have climbed up them!
A very exciting development in recent years has been the construction of a tarmaced cycle path by Sustrans which will eventually reach all the way from Oban to Fort William. Large portions of it have already been completed and the route is breathtakingly beautiful.
Click maps above to enlarge
Oban also has many local islands which are perfect for cycling. The ferries take cycles on for free. Kerrera is the nearest island and is only suitable for mountain or hybrid bikes. Lismore is a perfect size for cycling round with good quiet roads and an excellent tearoom and museum. Lismore can be reached from Oban and Appin. You can catch the ferry from Oban to Lismore, cycle up the island and catch the ferry back to Appin then cycle back to Oban mostly on cycle paths. Mull is only 40 minutes away and is also a good destination for cycling. The roads are busier though with more heavy traffic so possibly not suitable for beginners or nervous cyclists. Ferry times can be found on the Calmac website.