It's uncertain whether the Republican governor sign the measure repealing the state's helmet law, The Detroit News reported. Snyder had told GOP lawmakers last year he would consider repealing the helmet requirement only as part of a plan to reform the state's no-fault insurance laws.
The Senate approved a repeal bill Wednesday that had been passed by the House Nov. 2, but it is not part of an auto insurance reform package.
The legislature is controlled by Republicans.
Geralyn Lasher, a spokeswoman for Snyder, called the vote "kind of a surprise move" but would not comment on whether the governor will sign the measure.
"We will review the bill when we receive it and the governor will determine whether it will be signed," she said.
Under the repeal measure, motorcyclists 21 and older could ride without a helmet if they have $20,000 in health insurance coverage and meet experience or training requirements.
The News said 27 states allow cyclists to ride without helmets, while 20 require helmets on all riders and three have no helmet requirement.