The rules specify that we use FF tires for our FST cars. And, the specific sizes are part of the rules. From the GCR:
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2. Tires shall be Formula Ford slicks in standard front and rear sizes and using a hard compound. The Region, Division and/or racingseries sanctioning the races shall specify which manufacturer or manufacturer’s tires meeting this general description shall be permitted. Regional, Divisional and/or Race Series Tire Options:
1. Option 1. The spec tire manufacture for Formula First shall be Hoosier Tire. Front tires shall be #43130 20.0”x 6.0” – 13" R60 or R60A compound. Rear tires shall be #43302 22.5”x7.5”– 13” R60 compound or #43307 22.5” x 7.2” x 13” R60A compound.
2. Option 2. The spec tire manufacture for Formula First shall be Goodyear Tire. Front tires shall be #807-366-068 3321 20.0”x 6.0” – 13” R600 compound. Rear tires shall be #870-274-068 2015 22.5”x 7.5”– 13” R600 compound.
3. Option 3. The spec tire manufacture for Formula First shall be American Racer Tire. Front tires shall be 20.0”x 6.0” – 13” 133 compound. Rear tires shall be # 22.5”x 7.5”– 13” 133 compound.
4. Inter divisional races or special events may choose to allow more than one tire option by listing the options allowed for said event in the event supplemental regulations.
3. Any tires (brand, size, tread or construction) fitting the 13 x 6 rimsmay be used when the Chief Steward declares a rain race.
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There is a trend in the faster FF racers to use fronts on the back end instead of the wider standard FF rears. See the discussion on the Sprints in the FF section for reference.
It seems to me that this might be something to consider as an option for us in the 2010 race season.
Has anyone tested using FF fronts on the rear? With our reduced HP. it might be a better option for some (or all) tracks.
Also, using the same tire on all four corners would reduce the number of spares needed to have at the track, I know we should replace in pairs, but if one tire becomes unusable, we could use one of our 'second set' of tires as a replacement in an emergency. This would also potentially reduce the overall tire expenses for the season.
I would be interested in everyone's opinions on this topic.
TIA