Base Model The base Cobalt came with two lug patterns: 4 x 100 - fairly common pattern, easy to find 15-16 inch wheels with this pattern 5 x 110 - uncommon pattern Both versions have the smaller Cobalt axle spline so they are interchangeable if you want to change your lug pattern. We recommend swapping to 4x100 to make it easier to find wheels. All you have to do is buy 4 lug base model hubs (2 front and 2 rear) from your local auto parts store. SS/SC (05-07) The SS/SC Cobalt only came with the 5 x 110 lug pattern. The SS/SC 5x110 bearing hub has the same size axle spline as the base model. This means that you can easily swap to 4x100 just by swapping out the hubs. We recommend swapping to 4x100 to make it easier to find wheels. All you have to do is buy 4 lug base model hubs (2 front and 2 rear) from your local auto parts store. SS/TC (08-10) The SS/TC Cobalt only came with the 5 x 110 lug pattern. The SS/TC 5x110 bearing hub has a larger axle spline than the base or SC hubs. This means you have to stick with a 5 lug pattern. We recommend redrilling your hubs to 5x114.3. This pattern is far more common and easier to find wheels for. If your donor had ABS, you will have clearance issues when you move the rear Cobalt bearing hubs to the front. The wheel speed sensor collides with the steering arm. ABS/Wheel Speed Sensors We haven't attempted to adapt the Cobalt ABS. The system is pretty complex and would need quite a bit of work to get it to function safely. When you move an ABS equipped rear bearing hub to the front of the Goblin the wheel speed sensor plug and housing will contact the steering arm. The wheel speed sensor plastic will need to be modified for the hub to bolt up without damaging the hub. There are two different versions of the wheel speed sensor and one of them (the one on the right) is much easier to adapt. The first style, part number 512250, has a tall plastic housing that has major interference with the steering arm. If you cut this plastic housing enough to clear the steering arm, the bearing inside will be exposed. You'll have to figure out a way to seal up this hole with the plastic removed. The other style, part number 512285, has a shorter housing. For this style, you will just have to cut the connector portion of the wheel speed sensor to get it to clear. This does not expose the bearing. These hubs are interchangeable on the Goblin. If you have the version on the left, we recommend replacing it with the version on the right to make modifying the hub much easier.