Posted: Yesterday at 10:25
For lower price bikes you are confined to an alloy frame and the weight is always going to be more than ideal - a few hundred quid will get you a built bike at about 10kg - 5K will get you one at 7kg. Weight of frame and going up levels in componentry shaves a lot of weight off. However, unless you are riding a lot of hills you won't notice a huge difference other than the pick up in speed. Over a 10% gradient weight really becomes a factor but you can offset this by not eating as many pies! Worth investing in a bike with a carbon fork to take some vibration out. There are loads of reviews out on the magazine websites and on bikeradar that give an idea of which bikes are available for each price bracket.
Think about what you want it for: commuting - go for comfort and a hybrid type bike, cross training - go for a relaxed set up road bike, sportive riding - invest in a good frame and upgrade bits like wheels / components over time, triathlon - invest a bit more in a more aggressive bike with some aero qualities and a decent group set like Shimano 105 as minimum.
You can get a decent carbon bike for a grand from somewhere like Planet X or Ribble with OK wheels and a good groupset. More mainstream, Boardman bikes stocked by Halfords always get good reviews too.
I started with a ??1200 Giant TCR on Shimano tiagra (basic-ish groupset) and used this for a couple of years including for an IM. Then wanted a more aero bike so bought a Cervelo P3 on Dura ace groupset (top of the line) tri bike for racing, then wanted to upgrade my road bike so picked up a Cervelo R3 with electronic groupset and relegated the Giant to the turbo and for mucky winter rides. Then wanted to upgrade the tri bike wheels etc etc etc. It never ends!
Cracking 5K Leslie - great to see you running well and injury free.