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I would think the smaller wheels and tires would effectively reduce the moment of inertia thus reducing the stress on the system (less rotating mass).
Comparing stock 20" tires vs winter 18", on tire rack, the winter tires are actually 0.3" larger, so drivetrain would actually run slightly slower, not higher.
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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i
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