I am buying a road bike, a Lapierre AUDACIO 400 DB. Its my first road bike and I'm a bit green. As indicated, it has two front rings but I was originally looking for a 3 ring but there are none available in my size.
The shop have told me that they will put an extra small ring on the back of the bike which will work equally as well as having a third ring on the front. As the shop is really reputable and the guys know their stuff this seems reasonable, but I thought I'd put it out there and see what you guys think?
I will probably use the bike for some alpine biking next year so there will be a lot of uphill work. My primary reason for thinking I need a third ring though is because I have a bad knee which I've blown once already doing another sport and as that put me out of commission for 6 months I don't want to run the risk of putting it under too much pressure again.
Does the small ring on the back sound like a good option?
Thanks for the help.