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'03 outback limited, '01 Outback Limited, '01 Legacy L wagon, '96 Legacy Brighton wagon
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One thing not mentioned is, on a roller dyno, how much the flexing of the tire contact patch and sidewalls takes up in HP to get the tires to conform to the roller - different tire constructions will yield different results, even when the tires are the same diameter - or more correctly, loaded rolling radius.
 

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2008 OB Limited 2.5i, Portland OR USA
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6,313 Posts
Jalopnik is also a bit confused about physics, and misunderstood Jason Fenske in the Engineering Explained video that he linked.

If wheel diameter alone determined power delivered to propel a land vehicle forward, this experimental TGV certainly would not have attained the world's fastest rail speed at 574.8 km/hour:

https://en.wikipedia.org/wiki/TGV_world_speed_record

Note that they increased wheel diameter from the TGV Lyria's stock 920 mm to 1050 mm in order to improved overall gearing and keep electric drive motor speed reasonable.
 

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2002 3.0 VDC Wag + 2018 2.5 Leg Ltd
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26,305 Posts
not mentioned in the main article.

braking distances increase with more spinning mass on the wheel/tire.
 
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