I put 1 1/4 hole in middle on my apex this year to test and so for so good. I also west to 8 inch 2 wheels and mtn tamer rear susp. at same time , it works great but lots of changes all at once, hard to really tell. I really wanted better hyfax life with no bogie wheels at all , so far good! The biggest difference i noticed was when you blow through the travel in the rear you dont get the air pressure built up and false bottom feel in the rear.