Marty
Upon further checking, I see that the wheels on the Sideways are larger than the 15 X 8 Slot.it wheels (PA-17) that I normally use. They may be more the size of the 16 X 8 (PA-43) Slot.it wheels. I do not have any of these wheels to check. I have always found the Slot.it wheel nomenclature confusing. In the old catalogs, wheels will be listed as 15,8 X 8,2 (commas, not periods); the part number is PA 17 and the description on the label of the parts package is 15 X 8 Wheels. Other wheels are listed as 16,5 X 8,2 and the part number is PA43. I don’t have any of these to see how the package is labeled. I have typically used the 15 X 8 PA17 in either aluminum or magnesium form for most of my cars. Our Group C rules allow for either the PA17 or PA43 size. Assuming lighter weight and smaller diameter for lower center of gravity favor the smaller size, I do not know if the PA43 larger size have any disadvantage (or any advantage).
Concerning the Sideways cars, is only the PA43 Slot.it size allowed? Since I have none, and considering the issue with the inserts, I will probably use the stock Sideways wheels.
Thanks
Russell