FORMULA FORD CHALLENGE SERIES
Technical Bulletin
TB: 012
Subject: Avon ACB9 Vintage Formula Ford Race Tires by Nova Tyre
Specifications Nova / Avon ACB9 Vintage FF Tires:
V
Values in parentheses are measured vs. Nova / Avon advertised approximate dimensions.
SUGGESTED STARTING POINTS FOR SETUP AND ALIGNMENT
Camber
These tires perform best with only slight negative camber:
Front: -0.25° to -0.5°
Rear: 0° to -0.5°
Caster
Same as with bias slicks: +3° to +5°
Toe
Front: 1/16" to 1/8" toe out
Rear: 1/16" to 1/8" toe in
Tire pressure
Tire pressures are a matter of driver preference and "feel". The rear sidewalls are not very stiff and move sideways when turning in, then take a set. The front and rear tires develop maximum grip at slip angles greater than the bias slicks.
Cold: F12 R13 psi
Hot: F15 R18psi (maximum)
For rain / wet conditions set pressure to "hot" settings.
Ride Height Change vs. Hoosier VFF Tire
Published circumferences indicate the Front Avon tire is slightly taller than the Hoosier VFF tire, which may require an adjustment in front ride height.
The rear Avon is slightly taller, therefore little or no ride height change is required.
Gear Ratio Change vs. Hoosier VFF
Since the rear Avon tire is only slightly taller, most tracks will not require a gear change.
For Comparison - Specifications Hoosier Vintage FF Tires:
Item # | Size | Compound | Tread Width | Diameter | Circumference | Section Width |
|---|---|---|---|---|---|---|
17680 | 5.0/22.0-13 | A46 | 5.51" | 21.6" (21.8") | 67.86" (68.5") | 7.2" |
17681 | 6.5/23.0-13 | A46 | 6.69" | 22.7" (22.76") | 71.3" (71.5") | 8.5" |
Item # | Size | Application | Tread Width | Diameter | Circumference | Section Width |
|---|---|---|---|---|---|---|
44165 | 135/545-13 | VFF | 5.4" | 21.3" (21.5") | 67" (67.5") | 6.6" |
44170 | 165/580-13 | VFF | 6.8" | 22.7" (22.6") | 71.2" (71") | 8.5" |