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Message: [QUOTE="JTT, post: 88278, member: 19620"] I guess I didn't explain what I meant very well...sorry. I was intending to say that, for example 1" of 32mm catridge movement would move a different amount of fluid that say a 28mm catridge with the same 1" of travel. With that in mind the ports on the larger piston would have to be larger to accomodate the additional volume, all other things being equal. What I was trying to get at with the shim diameter question is that difference in area between the largest shim and the inner walls of the cartridge (combined with the float) is the area that fluid can "free flow" before having to deflect the shims. I would think that, for instance a 23mm piston, with a 20mm shim would not be capable of "free flowing" as much fluid as a 32mm piston with a 29mm shim (again, with all other factors equal). This may have nothing to do with nothing...just trying to get it straight in my head :think [/QUOTE]