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In the test results shown for the second reference above, the tire heights are similar. There is a progression of aspect ratios to maintain ride height so the test does isolate the effect of the tire width to CD:
Figure 5.72 on page 295 shows a drop from .32 with 225/55/15 down to .29 for a 155 R 15
The other reference (fig. 4.117) does not specify the aspect ratios.
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