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Where did you guys get that info regarding the tread width?
figures taken from willtheyfit.com shows the following:
205/5516 195/65/15
Diameter 631.9mm 634.5mm
Circumference 1985.2mm 1993.3mm
Poke 44.6mm 38.2mm
Inset 120.6mm 114.2mm
Speedo error 0% -0.41%
Reading at 30mph 30mph 29.88mph
Reading at 60mph 60mph 59.75mph
Ride height gain 0mm 1.3mm
Arch gap loss 0mm 1.3mm
this means a decrease in revolutions of 0.41%
the profile width is reduced by 10mm or 0.393700787 inches which is fairly accurate but why would the tread width drop by 1.4 inches?
also
old diameter of 631.9 millimetres = 24.8779528 inches
new diameter of 634.5 millimetres = 24.980315 inches
I am a bit confused? please help..
But the main question remains, are narrower tyres that balloon better than wider tyres that do not in terms of aerodynamics? I know the weight loss has great advantages for lower speed savings but I am looking at high speed improvements as I spend most of my time at 70MPH on UK motorways (30k+ miles PA)
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