Need a tip on buying a road bike, maybe 2nd hand. Help me cycling experts!?

I'm in the market for a new bicycle, but seeing as the last bike I owned was a birthday present for my 14th birthday a fair few years back, I'm not really up to speed on these things. My last was a full suspension mountain bike, and was HEAVY. And spent most of its time on the road.. when it wasn't... show more I'm in the market for a new bicycle, but seeing as the last bike I owned was a birthday present for my 14th birthday a fair few years back, I'm not really up to speed on these things.

My last was a full suspension mountain bike, and was HEAVY. And spent most of its time on the road.. when it wasn't in the garage. So this time I want a road bike, I'm not really sure what you'd class it as, not a full racing bike with the clip in pedals etc but very light, fast and strong.

You may correct me on this, but I had a hunch these bikes are the sort of thing people buy, never use, and sell on. So I thought I could get a really good deal buying 2nd hand. So if you could help me out with particular brands/models to look out for I'd be massively grateful.

My specification;
Must be a light and fast road bike, but can handle a bit of dirt occasionally.
There's a possibility it may be taken on a cycle trip through France, so it has to be able to handle rougher stuff moderately well occasionally.
I'm 6'2", if that makes any difference.

Again, any advice or tips on what to look out for much appreciated.
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