The definitive OTP ( Off-The-Peg ) List (<£500 and <£1,000 sections)

It will actually make you faster up hills (as would any reduction in weight anywhere). Just not enough to notice!

The nice thing about a light bike is the handling (direction changes, hopping over things etc,.).
Also, saving 4 kg on bike weight will feel noticeably different/better than saving 4 kg on body weight.

I ride in a club and have the heaviest bike. But I have proved that losing 26kgs makes more of a diference when climbing than any of my mates who have light carbon bikes with all the latest light weight groupsets and wheelsets. It really pisses some off when I go flying past them on my 25lb bike and they on an 15lb bike. And I can hop curbs better. So yes you will feel a slight diference in a light bike and most likely the good feel factor of riding a best bike. But dont kid yourselves that its better losing bike weight than body weight. I've been there, done that and worn the tee shirt. I'm buying some dura Ace wheels in two weeks so the boys can look out then cos I believe they are lightweight ha ha But enjoy