Ok, this is bugging me. Always ridden hardtails and free of neck pain. Recently picked up a short travel full sus frame. Built up with my hardtail parts. Geometry is pretty similar. But really suffering with acute neck pain after 30 mins. I've messed around with stem and bar lengths to ensure seat to stem and seat to bar tips is the same as my hardtail, with no joy. I've tried another fork with longer steerer to raise the front end a wee bit. No joy.
Seems odd to me, so the key variables are the frame geo (and it's a tiny bit longer/taller than my hardtail) and the bounce! Rebuilt my hardtail and rode a couple of hours pain free.
I'd like to try the full sus but really struggling. Any suggestions, apart from ditching?