Yep, they sure are. Standard 1/8 scale uses 8mm axles. I guess when we were talking about this, I didn't realize that the Dace adapters were made for 1/8 scale.
Just so others are aware of my way of adapting the Maxx/Revo to 17mm, here's what I used when I had my Revo:
http://www3.towerhobbies.com/cgi-bin...?&I=LXSCH9&P=7
http://www3.towerhobbies.com/cgi-bin...?&I=LXMDB3&P=7
http://www3.towerhobbies.com/cgi-bin...?&I=LXMDC0&P=M
The Savage actually uses a larger bearing on the axle, so it's not a perfect fit with the wheel
off. But when it's all tightened up, it's tight and won't come undone. Those nuts actually dig into the wheels when tightened enough, and I never had a single one fall off on my Revo.
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz