My question is, if you have a 28.5 boot with a 323 bsl and you go buy a different boot size:28.5 but it has a 310 bsl. Will they still fit in your bindings. or will you need to remount? I know its probably a stupid question but i need to know.
get a shop to see if you can slide the heel enough to fit, also depends if u mounted true center then you will be farther forward so you might want a remount. But if the boot is has a smaller bsl it wont be safe to keep the bindings the same
With a BSL difference 5mm, you should have enough movement in your heel piece to not have to remount. Unless you're confident that you know what you're doing, just take them to a shop and have them do it for you.