My first post so 'Hi All'. I am off to my local bike shop this afternoon to have a look for a suitable bike to buy on the 'Bike to Work' scheme. But I have a few questions as the last time I bought a bike was about 15-16yrs ago. 1. I am 6'3" and 15 stone and have been advised by several cycling colleagues that i should get a steel frame and not aluminium or carbon as they are not as robust (because I am a big guy)......is this true or are they all pretty good? 2. I mainly want to use the bike on roads and eventually to and fro work when my fitness has improved, although I would like to go on some cycle tracks which arent off road tracks but are not tarmac either. Therefore should I buy a hybrid or a road bike and use my 15yr old £199 halfords special for the cycle tracks? 3. My LBS specialize in 'specialized' and am worried that they may try to force a specialized on me without it being suitable just because they get a higher 'mark up' and due to the fact I am a noob! Can anyone give me a idea of what to look at for about £500 budget.