What I don’t understand is that some of these £6-7k bikes don’t even seem to be cheaper than buying a frame and building it up
Yeah, this is the stuff that baffles me the most, used to be the case that FULL bikes were drastically better value. Really bad example, bit of an easy target (even though I own one):
http://www.orangebikes.co.uk/bikes/five_pro/
So we’ve got a £1500 frame, £330 groupset (Merlin), £250 wheelset (and I’m being generous given those rims), £150 finishing kit (which is even more generous), £400 fork. The remaining £400 for them to build it?
I’m not convinced components have hugely gone up in price, just seems to be full bikes taking the p.
http://www.evanscycles.com/products/specialized/carve-pro-2013-mountain-bike-ec042223
M4 being their cheaper, older alloy. £300 groupset, £300 forks, own brand finishing kit…errr £1000 frame!