ORIGINAL: magnat
The Circle Rims or Disc Rims are often the lightest as they are approved for Racing keeping Strength and weight balanced, they can be made to look better with Rim Decals...
Yes plus the fact that disks are banned from competition level. Don't get disks; they are ugly.
Also HPI use a lower quality plastic to Tamiya. Get yourself some decent official tamiya rims. All the wheels in the range are reinmforced in a star pattern behind the design; to give the wheel strength.
Cheaper wheels are often made of this lower quality plastic; many people lose spokes even when the wheel is under very little pressure!
Trouble is; at the end of the day all rims get chipped. Chrome wheels look worse once this has happened; therefore black wheels look best as it is less visible. You can get aluminium wheels but they are expensive.
Chris.