caption ridertype updated proteam birth_place discipline birth_date proyears role image article_title name currentteam
zirbel at the 2012 tour of california time trialist may 24 , 2014 bpc 2006 jsh 2011 kbs 2012 clear lake , iowa , united states road 30 october 1978 2006 -- 2009 2011 2012 -- rider tom zirbel , tour of california 2012.jpg tom zirbel
 tom zirbel kbs
tom zirbel

tom zirbel -lrb- born october 30 , 1978 -rrb- is an american road bicycle racing cyclist from clear lake , iowa , riding for .
he rode for from 2006 to 2009 .
he came fourth in the uci road world championships time trial in september 2009 , and had signed to join uci protour team the following season .
in december 2009 , a urine test taken at the 2009 uspro time trial championships the previous august , in which zirbel came second , tested positive for dhea .
zirbel denied having taken the substance knowingly , but he nevertheless voluntarily accepted a two year suspension , and immediately announced his retirement .
his suspension was reduced in march 2011 to 18 months , which had already been served , in recognition of assistance given to the us anti-doping agency .
he suggested that , despite earlier comments about retiring , he would seek to resume his racing career .
he maintains that he ingested the banned product inadvertently .
in 2011 , zirbel rode for .
on may 28 , 2011 he placed 2nd in the us pro time trial championship , behind david zabriskie .
he joined for the 2012 season .
