Python Syntax error in ArcGIS field calculator

I've been unable to get a simple block of code and am hoping someone can spot what is wrong. I feel like I'm blind.

1) I create a new short integer field called "SpeedLimit" in my ArcGIS attribute table that signifies the speed limit for a road type.

2) The road type is a string found in the field "fclass" in the same table.

I open the field calculator for the SpeedLimit field and fill the following:

Pre-Logic Script Code:

def Speed(class):
    if (class == ‘secondary’ or class == ‘tertiary’ or class == ‘trunk’ or class == ‘motorway’ or class == ‘primary’):
        return 70
    elif (class == ‘secondary_link’ or class == ‘tertiary_link’ or class == ‘trunk_link’ or class == ‘motorway_link’ or class == ‘primary_link’):
        return 45
    elif (class == ‘service’ or class == ‘track_grade1’ or class == ‘track_grade2’ or class == ‘track_grade3’ or class == ‘track_grade4’ or class == ‘track_grade5’):
        return 15       
    else:
        return 30

SpeedLimit =

Speed(!fclass!)

Can anyone spot what I'm doing wrong to receive a syntax error?