Hey guys, last year due to some great help on these forums, i purchased my first road bike. I ended up getting the low end Giant OCR 4. I loved the bike and road it everywhere.

Unfortunetally last week someone stole it . It was locked up with a £30 lock (however not d), and was stolen in broad daylight, in a busy shopping area. Still gutted, but on the lookout for a new bike

I dont have too much to spend, max about £325, and would be looking for a similar bike, preferably in the Giant range. It was size 51, and im just wondering what size that converts to, M?

Cheers for your help guys