Thanks for the advice. Largely I'm already pretty comfortable but after a while feel the need to sit more upright and put my hands on the top bars so that I can stretch my neck and back a bit. I've noticed that when I'm in my comfortable position (hands just behind the hoods) I can see the hub clearly behind the bars so I might try a 100mm stem. Thanks for the advice. I'll have to check out some sites on the internet and re-examine my riding position.