Originally Posted by syndr0me

The car comes with 44's up front, but many of us have found that if you plan to use the spool, 46's are the way to go. They sit deeper in the spool cups, and keep them from breaking. My spool cups last forever now, where before they'd break with surprising ease. I'd recommend using steel in the front since the alum bones bend very easily. The part number is 51092, and is directly compatible with the hardware that comes with your kit.

Don't just take my word for it, though. Have a look at the videos RedRC did on the 416 with Jilles, and you'll see he too prefers to use 46's up front on his new kits. He mentions it in video 4 or 5.