Classic Car Type (BSA Rules)
Modified Car Type (Modified Rules)
Weight
5.0 ounces or less
No Limit (within reason) - Recommend less than 16 ounces
Wheels
Official BSA wheels must be used. Lightened wheels are NOT allowed. Wheels may NOT be reshaped. The tread fluting, raised lettering, inside and out and other markings must remain intact and visible. Rounding, grooving, H-cutting, V-cutting, or narrowing of the tread surface is NOT allowed.
Wheels may be modified as long as width is maintained.
Outlaw wheels are OK.
Axles
Axles may be filed and polished to remove crimp marks and burrs. Axles must be attached directly to the wood body of the car.
No limitations to axles as long as car will fit on the track
Prohibited
NOT ALLOWED: springs, magnets, moving weights, mercury weighting, wheel bearings, wheel bushings, wheel washers, starting devices, propellants, glass, excessive fragile parts, loose objects
NOT ALLOWED: propellants, glass, excessive fragile parts, loose objects