Got my first indoor trainer, and it feels a bit like riding on baby cobblestones especially at high speeds (Tried an all out seated sprint and did 1450w at 138 rpm 53x11 measured by my power meter).
I find this saps some power and takes away from the riding experience, is it likely an off-center flywheel or drum? How much you tighten it doesn’t make a difference and my tire is quite round. Send it back to chain reaction?