The best replacement for radials is slicks.

The best alternatives to radials are rated as following:
★★★★★  slicks
★★★  street tires
★★★  counterpoise
★★  snow tires
★★  bias ply
★  terminators
★  et streets
★  studded tires
★  drag slicks
★  mickey thompson
★  nitto drag radials
★  zillas
  mickey thompson drag radials
  drag radials
  winter tires

Your alternative for radials is not listed? Suggest!
Speaking about radials, one probably shouldn't forget about vertical antenna.

Other search terms related to radials and their ratings are:
★★★★★ vertical antenna
★★★★★ slicks
You have in mind a companion for radials and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of radials in all years. Click on graph for more.
radials
slicks
street tires