RE 150 fork: This is easily the best upgrade i have done. Replacing the 140 RL’s with 150 RLC’s! Finally been able to find a happy medium between air pressure (sag/ using all the travel) and low speed compression (not squidging away under braking etc) So much more confidence in the front end, able to run lower pressure and get a smooth ride, but have a bike that can handle hard braking, especially on the way down hill, and still feel linear / controlled. Can’t say i notice any difference in climbing or wandering. I run a bit more sag now, so the angles probably aren’t much different to the 140 in reality. I was never happy with the original front fork, felt it let the side down somewhat, now, well, i don’t even notice it working (like the rear suspension has always been) so it’s a massive improvement. Well recommended. ( I did um-and-ah about going to a 34mm fork, if i had gone new (rather than the s/h fork i bought) i probably would have gone bigger at the expense of a little extra weight.
RE ST’s: Too early to tell really, only about 5 rides old. So far, i can feel the extra stiffness, and the freewheel is soo much more positive than the factory fit Easton XC70 one.
Other obviously good mods have been adding a rear mech with clutch and modifiying the wheelset to take a big diameter rear QR / axle