A seven-lug wheel uses seven studs. 
An eight-lug wheel uses four studs. 
Choose the correct taper design of flange studs to fit the wheel lug seats. 
The mounting area of the flange stud must match the design of the 
wheel’s lughole seat or depression. 
The flange plate must be able to apply pressure to the center of the wheel while 
maintaining perpendicularity to the shaft. 
NOTE:  If the lug seats are unevenly machined or worn, an optional 
universal flange adaptor with compressible studs or bolt on 
lugs may be used to more accurately mount the wheel with 
the cone. 
Flange plates are useful when the wheel cannot be properly centered off the hub 
bore with a tapered cone alone because of improper fit, interference, or lack of a 
center hole. 
A flange plate in many cases adds value because it aids in more effective centering 
than a tapered cone alone. This statement is true for many wheels including hub 
centric wheels. That is why a flange plate and back cone may be more accurate and 
repeatable, regardless of whether the wheel is lug centric or hub centric. 
Expandable Collet Mounting 
An expandable collet should NOT be used with the Road Force / GSP9700 due to 
the amount of force applied by the load roller. 
Using the Pressure Ring and Spacers 
Pressure Ring 
The pressure ring clips on to the wing nut. It is used in lieu of the clamping cup.  
It may also be used in place of a clamping cup if space is limited between the wheel 
and the end of the spindle. 
The pressure ring should be used to prevent the wing nut from directly contacting an 
adaptor or a cone. It will act as a bearing to enable higher clamping forces. 
34
 Balancing Procedures  GSP9720JLR Wheel Balancer Operation Instructions