american community surveys aren't 'bike counts'
The research from Pucher and Beuhler did a fair bit of corrections for reporting bias in various factors they considered, and were able to unequivocally point to the prevalence of bikelanes and bike paths affecting bicycle commuting.
Eugene - robust network, high percentage of bicycle commuting.

Originally Posted by
study
analysis of newly collected data on cycling facilities in 90 large U.S. cities shows that cities with a greater supply of bike paths and lanes have higher bike commute levels—even after controlling for other factors that may affect cycling levels......we find that the supply of bikeways per capita is a statistically significant predictor of bike commuting.
you guys didn't read the study, did you?