SPECIFICATIONS Front Bearing Outer Diameter: 17mm (0.67") Inner Diameter: 9mm (0.35") Thickness: 5mm (0.20")
Rear Bearing Outer Diameter: 17mm (0.67") Inner Diameter: 9mm (0.35") Thickness: 4mm (0.16")
lmm 11.4.10
http://shop.towerhobbies.com/cgi-bin/wti0001p?&P=WR&I=LXAHZV