I have just bought a BTwin 900 AF. It seems like a quality machine but I'm struggling with it. Background: I'm 46, 16stone but general fitness and endurance is ok. I've ran 3 marathons in my 40s. I cycled 250 miles over 5 days on my hybrid 4 years ago. I've never had a road bike before and I know it'll take some getting used to. I also accept I'm not the fittest and I'm quite heavy, but I literally cannot cycle up a hill of any kind and I can't believe it's purely down to fitness. I still have my 12 year old hybrid that I managed to cycle up the An Clisham on the Isle of Harris and the Rest And Be Thankful and I can get up any hill on that, albeit slowly. I can easily sustain 20-25 mph on the flat. Am I missing something? Is there a problem with my bike? Shouldn't it be easier on a road bike than a hybrid?