Quote:
Originally Posted by Rudernst
ahem
apart from technical aspects of what works how and is quicker..
how about a look at the regulations ?
to get an HTP, which is requirement for at least some Junior races, such as the Lurani and Goodwood
you need to adhere to the original specification
OF THE CAR IN QUESTION
or justify the changes (difficult)
you cant just simply find the quickest wheel / tire combo and fit it to the car
on paper at least....
what is done in Juniors and how this gets policed is a different matter
and how long this free for all attitude will last is even more of a different matter
fascinating, that this was not worth mentioning in this thread before
RuE
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Being a lawyer, that was the first place I looked.
The tyre regs are only strict as to the need for CR65 (or CR48 in the case of the L15 450).
If you can point out where the rules restrict tyre size selection I'd appreciate it.
Thanks.
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8.1. General
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8.1.1. Formula Junior cars must use either Dunlop Vintage range tyre R5 pattern or older, or ‘L’ section tyres which have 204 compound and tread pattern CR65 or in the case of size 450 L 15, the CR48 (R6) tread pattern.
8.1.2. Cars which have wheels with rim widths of 3.5 inch (88,9mm) or less and for which there is no Dunlop Vintage range tyre of a suitable specification available, may use tyres offered for sale as cross ply or radial road tyres, with an aspect ratio of 75% or more, having a speed rating of ‘S’ or above and which have ‘E’ or ‘DOT’ approval. The manufacturer should be consulted as to the suitability of the tyre for the event.
Note:
This only applies to some Stanguellini, Volpini and other early Italian cars.
8.1.3. Rim widths must not be increased but may be decreased in order to accommodate available tyres. Due regardmust be paid to the impact upon the resulting vehicle track, refer to 6.18.1.
8.1.4. The interior of the tyre (space between the rim and the internal part of the tyre)must be filled only with air or nitrogen. This does not preclude the use of inner tubes.
Prohibitions:
8.1.5. It is not permitted to use any tyre heating/heat retention devices.
8.1.6. It is not permitted to use tyre or compound treatments.
8.1.7. It is not permitted to use Dunlop M section tyres