Results of camber camber surveys.
#37997 from Touring Committee · Recommended to the Board · Minutes (2025-05 Fastrack)
The Touring Committee has surveyed the active membership regarding the proposal to change the camber limit in T2, T3 and
T4. The original rule, setting the limit to 3.5 degrees, has been in effect as the classes evolved. As time goes on and production
cars has become more complex, the average operating life of Touring cars has increased. Members are building cars and
expecting them to last 10 years or more. The TAC believes that the 3.5-degree camber limit, much like bolt in roll cages, should
be a thing of the past.
Survey Results-
The survey was a simple, containing 1 question: “Are you in favor or removing the camber limits in T2, T3 and T4? Yes or No.”
There were 130 respondents. A majority of respondents (73.85%, 96 people) were in favor of removing the limit. A minority of
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respondents (26.15%, 34 people) were not in favor of removing the limit. There were a variety of comments. Detractors
mentioned; rules creep, performance parts cost, and effects to BOP. Proponents mentioned; increased tire life, and decreased
long-term operating expense. With inaccuracies in tech, many members have expressed frustration with the buffer they needed
to feel safe at tech inspection.
Interpretation-
By removing the camber limit, racers can find an optimal setting that prolongs the life cycle of the most expensive wear item on
the car, the tires. In many cases, this optimal setting may be only a few tenths off of 3.5 degrees. The Touring rules already
allow various means to achieve camber, including; eccentric bushings, eccentric bolts, slotted top hats, shims, and adjustable toe
links. Some cars have individual spec line allowances if camber cannot be achieved. It is the intention of the Touring
Committee to launch the new rule as of January 1, 2026. This provides ample time for members to request spec line allowances
to adapt to the change. Remember, current camber-related allowances tend to be the most affordable and basic options
available. Future allowances would follow this trend.
In GCR, Section 9.1.9.2.D.5.a. Suspension Adjustments, change as follows:
"1. T2-T4: (Effective 01/01/2026) A maximum of 3.5 degrees of negative camber is allowed on front and rear suspensions. Spec
line part(s) may not be modified to increase caster and camber. Strut suspensions may adjust camber and caster by the use of
eccentric bushings, eccentric bolts (crash bolts) at the strut-to-spindle, and/or by use of slotted 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. 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.”