I'm getting a 500 foreman 4x4 and need to know to get 26" swamplites or 27". I want them to still spin fast in deep mud. Thanks for your info.

The 27s will still work but if you want less power loss, then go with the 26s.

Do you want it to look cool or do you want it to perform well? I look at it this way if you are going to go big then you NEED the power to turn them and if you do go big go 27-28's. Just going up 1 size is not worth the power loss to me just to gain and extra 1/2 clearance. You need all the power you can get when in the mud and 1/2 in clearance in teh real world does nothing! Stay with an agressive 25" tire and keep your power for when you need it. You will notice a power loss with going up just one size but once they load up with mud it will really hurt. The swamplites are almost a 26" tire anyways. Nice lght tire, great in the mud, smooth ride, good wear. So it comes down to power or looks. What do you want most????