Most people in our club run zero rebound on carpet. I imagine rebound is useful on bumpy outdoor tracks, because it helps the wheel return to the track surface faster after a bump (you can't generate any grip if the wheel is in the air
![Very Happy :D](./images/smilies/icon_biggrin.gif)
)
I have found the new, flat membranes easier to bleed, and have also tried the Tamiya membranes which are stiffer than the XRay ones - couldn't spot any difference to be honest...(maybe my driving ability or style
![Confused :?](./images/smilies/icon_confused.gif)
) A lot of people say the Tamiya ones are "better".
I think the bladder affects the very first part of the damping action as you turn in - the softer, larger membrane will stretch and expand into the air space under the cap, so there is less damping action initially. The low profile, stiffer membranes force the oil through the piston holes earlier, so the damping action is stiffer on turn in. Thus the turn-in will be more aggressive. Obviously shock oil and holes in the piston affect all of this too.
HTH