Division 3.6.1.2
United Kingdom
The following parameters shall be within the following limits:
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transmission overall ratios (no more than 8 % higher than the lowest) as defined in point 1.13.3 of Appendix 4,
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reference mass (no more than 220 kg lighter than the heaviest),
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frontal area (no more than 15 % smaller than the largest),
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engine power (no more than 10 % less than the highest value).