I don't think they really leak on the fly, it's more while it's parked... And it's a slow leak either way but yeah, I personally wouldn't want to mess with them. If you wanted to try them out and see if you can get them to stop leaking once I'm ready to unload them you're more then welcome to. My last ditch effort is to while they're off to hit the mating surfaces 100% with wire wheel and then run a tap thru every single hole. At that point they "should" be pretty much brand new in that aspect at least. I don't totally remember if those mating surfaces were painted when mounted them or not honestly... I've only had them apart once. I do that on my champions and for some reason didn't do it on these KMC's and that really might be all that's needed. I'm just not sure right now though.