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Here is some information on the wheels size and offset for both models.
SlingShot SL:
Front Wheels 18X7.5 with +42mm Offset / 43.5 lbs with tires
Rear Wheel 20X9 with +45mm Offset / 53 lbs with tires
The SL's premium wheels are wrapped with 225/45R18 up front and 255/35R20 in the rear.
SlingShot Base:
Front Wheels 17X7 with +42mm Offset / 46.07 lbs with tires
Rear Wheel 18X9.5 with +45mm Offset / 57.07 lbs with tires
The Base gets 205/50R17 up front and 265/35R18 in the rear.
Lug nut Pattern is 5X114.3 for both
Keep in mind that while the size of the wheel is measured in inches, the offset is measured in Millimeters (mm).
What most people will look for is a wider rear tire... The main concerns with going with a wider rear are: keep the rear tire centered and not rub the swing arm...
So let's start with our center point. The rear offset is +45mm which is the center and keeps the wheel dead centered.
Ideally you will go for a wheel with +45mm offset...
The highest number (in my opinion) that you can go without noticing that the wheel is off the center is +/- 10mm
The higher the number of the offset the closer to the swing arm
The lower the number the farther out from the swing arm.
In other words:
+55mm will be 10mm closer to the swing arm (off center to the Right) Wheel cannot be too wide.
+35mm will be 10mm farther to the swing arm (off center to the left) Wheel can be wider.
SlingShot SL:
Front Wheels 18X7.5 with +42mm Offset / 43.5 lbs with tires
Rear Wheel 20X9 with +45mm Offset / 53 lbs with tires
The SL's premium wheels are wrapped with 225/45R18 up front and 255/35R20 in the rear.
SlingShot Base:
Front Wheels 17X7 with +42mm Offset / 46.07 lbs with tires
Rear Wheel 18X9.5 with +45mm Offset / 57.07 lbs with tires
The Base gets 205/50R17 up front and 265/35R18 in the rear.
Lug nut Pattern is 5X114.3 for both
Keep in mind that while the size of the wheel is measured in inches, the offset is measured in Millimeters (mm).
What most people will look for is a wider rear tire... The main concerns with going with a wider rear are: keep the rear tire centered and not rub the swing arm...
So let's start with our center point. The rear offset is +45mm which is the center and keeps the wheel dead centered.
Ideally you will go for a wheel with +45mm offset...
The highest number (in my opinion) that you can go without noticing that the wheel is off the center is +/- 10mm
The higher the number of the offset the closer to the swing arm
The lower the number the farther out from the swing arm.
In other words:
+55mm will be 10mm closer to the swing arm (off center to the Right) Wheel cannot be too wide.
+35mm will be 10mm farther to the swing arm (off center to the left) Wheel can be wider.