I browsed the
manual (PDF) of the savage 5T to get an idea on how hpi mounted a 5T tire (24mm hex) on a savage axle.
The interesting part is that you can run wheels with 17mm hexes and 24mm hexes (hpi even includes 2 tire sets: 5T and Savage XL). To achieve this you have to switch between 2 different wheel axle shafts.
HPI Part Numbers (Main parts needed to mount wheels with 24mm hex):
. 38305 Wheel Axle Shaft 8x11x47mm
. 38306 Wheel Hub 24mm
. 38308 Wheel Nut M18x24mm