Spherical Bearings/Bushings Introduced By Use of Slotted
#25680 from Laurie Sheppard · Recommended to the Board · Minutes (2019-01 Fastrack)
Adjuster
Please make the following changes to the Touring class rules sections (Effective 1/1/19):
Change 9.1.9.2.D.5.a.1:
5. Suspension
a. Suspension Adjustments
1. T2-T4: A maximum of 3.0 3.5 degrees of negative chamber is allowed on front
and rear suspensions. Spec line part(s) may not be modified to increase caster and
camber. Strut suspensions may de-camber wheels adjust camber and caster by the use
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of eccentric bushings, eccentric bolts (crash bolts) at the strut-to-spindle, and/or by use
of slotted adjusters adjustment plates at the top of the strut mounting plate. If upper strut
slotted adjustment plates are used, they shall be located on existing chassis structure,
utilizing the unmodified manufacturer’s original bolt holes and may not serve as reinforcement
for that structure. Slotted adjustment plates (strut camber plates) may incorporate a single
spherical bearing (spherical bushing) and a ball thrust bearing per strut tower. On other forms
of suspension, camber and caster adjustment may be achieved by the use of shims and/
or eccentric bushings. Slotted ball joints on A-arms on double wishbone cars may be usedfor camber adjustment only. Adjustable toe links with spherical bearings are permitted and
may serve no purpose other than adjusting toe angle. Spherical bearings/bushings are not
permitted in T2-T4 except for the specific examples listed in the class rules or vehicle spec
line. adjustable toe links that may serve no purpose other than adjusting toe angle, unlessspecifically permitted on the vehicle spec line.