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Arch Pediatr Adolesc Med. 1998;152:820.

	Since this article does not have an abstract, we have provided the first 67 words of the full text and any section headings.

I read with interest the very erudite letter of Dr Elfenbein, "The Physics of Bicycle Falls Revisited,"¹ in which he questions the explanation of Dr Williams.² Obviously both of these physicians overlooked the correct explanation, which can be given by any second grader. A bicycle falls because it is too tired.

Lewis A. Barness, MD
University of South Florida
1 Davis Blvd, Box 15
Tampa, FL 33606

1. Elfenbein GJ. The physics of bicycle falls revisited. Arch Pediatr Adolesc Med. 1998;152:411-412. FREE FULL TEXT 2. William MS. Bicycle-riding circumstances and injuries in school-age children. Arch Pediatr Adolesc Med. 1997;151:1067. PUBMED