In reply to mikehike:
> It seems that since 1995 technology has come on a long way, but disappointingly im finding mid priced bikes are a similar weight to those of old. Meaning, in general mid priced in 1995 was £1500 weighing 25lb, and now mid priced circa £2000-2500 still weighing 25lb. Surely due to modern materials, bike weights would have reduced?
In 1995 your 25lb bike would have gotten you an aluminium frame that was probably good for 2-3 years tops with excessive material saved in places that weren't ideal. It would also have gotten you canti brakes which didn't actually work that well, as I'm pretty certain 95 was around the era of low pro canti's that weren't as effective as the old school wider ones (as used by CX bikes nowadays) and pre v-brakes and well before discs. The drivetrain would have been 7 or 8 speed highly susceptible to excessive wear in poor conditions and if you got a suspension fork you'd have been doing well to get 80mm of travel and that would have pogo'd. Wheels that were either based around road rim designs or old fashioned touring rims so either extremely narrow and prone to bending or cheap and heavy and still partial to bending.
On a modern equivalent bike at the price point you've mentioned you'll get a top of the line suspension fork that works and has up to 150mm of travel, disc brakes that work on time, every time, revised geometry and materials science in the frame that unless you've either gotten unlucky with a bad design or are completely ragging it all the time is highly unlikely to ever break. Wheels are now more likely to be tubeless or tubeless ready. Plus things like handlebars, seatposts, stems, and other ancillary parts are much better designed and manufactured now. Basically for your 25lbs weight gauge you're getting a lot more in literal and performance terms than you did 18 years ago.
> Anyway, im trying to work out what’s going to be my perfect ride.
> Fuss Sus or Hardtail?
>
> This last 2 months ive been riding a Cyclocross bike on my local trails, 700c x 35 MTB tread low-ish pressure, which in effect is a rigid 29er. Ive been surprised how well it handles the rough stuff. Ok ive have to be careful with the likes of ruts and hidden holes. But it made me think do I need full sus? Can I get away with hardtail?
>
> I then had a blast out on the Proflex to find it feels like riding a mushy settee, in comparison.
Your proflex is a 20 year old full sus design, which whilst incredibly innovative at the time, was based around poor dampers and not having a full understanding of suspension kinematics. Whilst it may still be nice for retronicheness to have and ride the proflex compared to modern full sus's calling it a couch in comparison to the CX bike is a bit of a misnomer as a modern full sus will be a lot more controlled, stiff and versatile than your proflex.
> Hardtail is looking favourable considering the added comfort of running a higher profile tubeless tyre at lower pressure. Add to that 650b wheel diameter instead of 26”.
I like the idea of 650b, at least more than 29", as they're more versatile and stronger. Though I'm still not convinced it's a combination of fashion in the bike industry and constantly changing standards in the effort to get people to buy more bikes. Possibly best to wait a year or two before committing to 650b just to see where it ends up landing in the end. It may become the new standard, like 29ers have to an extent, or it may just turn out to be a misturn along the way.
> Ive just learned about SRAM XX1, 11 speed rear cassette, one front chain ring. No front mech or shifter.
Have you seen the price of an XX1 cassette? £305!!! That's just the cassette. Now I'll hold my hand up here and say I prefer Shimano stuff to Sram though that's just personal preference. Though for money involved in XX1 I'd rather buy an XTR drivetrain, plus with the XX1 cassette you need a specially adapted freehub to run. I don't believe Sram are going to downgrade the tech to the mass market any time soon either. In my opinion if one wants a 1x drivetrain then man up to the fact it has compromises either that or go 2x accept it has a few more working parts though gives a more user friendly range of gears.
> So my perfect ride could be:
> Carbon Hardtail, XX1, 650B Tubeless
Sounds expensive and full of compromises, to me.
> I realise choosing a bike all depends on what one want out of a ride, where you ride and how far you ride.
> My rides tend to be local, with a club of mixed bikes and abilities.
Doesn't actually say a lot about the terrain and distance you ride which would probably be more helpful in suggesting a bike style to suit your requirements.
> I might try locking out my rear end as an experiment.
For me my next bike will probably have a cf frame with between 125-140 of travel on the rear maybe 10-20mm more on the front, 2x drivetrain, a traditional screw in BB (i've yet to be convinced of the advantages of press fit BBs in mtbs), xtr trail type disc brakes and i'll probably keep the finishing kit and wheels I have on my current bike as it's quite good stuff.
All of the above are of course largely speaking only my opinions so may not necessarily be of interest or help to you though hopefully speaking they may be of some assistance.