The Town of Frankfort has no authority to regulate speed limits.
Authority To Set Speed Limits
New York State Department of transportaion has the authority to set speed limits on county roads and in towns having populations of 50,000 people or less. To change speed limits on those roads, the town board and the county superintendent of highways must file a joint request with the regional office of the New York State Department of Transportation to conduct a speed limit study.
If no ordinance, official order or regualtions has set a lower speed limit, the 55 MPH statewide speed limit applies.