Here are some comments from John on getting his Opel set up for the Houston track with C1 tires and the stock guide:
“As a side note, I installed a stock type guide and 1167 C1s which were take offs close in size to F30s onto the Opel. Ran a few laps and the C1s were not near as bad as I thought. Include the F30s in the box just in case. Gave Mark my car to send to Houston. If I mailed it from home it would take 2 days longer to get either to Austin or Houston.”