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Read the tire as part
of the surface.

Tread, compound, carcass and diameter interact with the track, temperature, vehicle and setup. This chooser teaches tradeoffs; it does not produce a grip score or a product recommendation.

AI-generated concept illustration comparing chunky crawler, fine-pin buggy and smooth drift tire appearances.
AI concept illustrationProvenance ↗
OBSERVE / CHANGE ONE THING

Start with the surface you have.

Manufacturer catalogues themselves distinguish tread patterns, compound/hardness and intended surface. For example, Pro-Line describes block tread as self-cleaning on loose surfaces, while its crawler listings identify tire format and compounds. Conditions still decide the result. Pro-Line product notes ↗ Pro-Line crawler catalogue ↗

Surface character
Relative tread reading
Relative compound

Brand labels are not interchangeable. Pro-Line’s own chart ties compound use to its product range, surface and temperature. Pro-Line compound example ↗

Loose / dusty dirt · open blocks · softer-labelled

Open blocks may shed loose material. Keep the exact brand/compound label and conditions in the note; do not transfer a “soft” label across brands.

  • Tradeoff: tread and compound can behave differently as surface, temperature and wear change.
  • Check: tire diameter, wheel interface, insert/carcass support and local rules before changing anything.
ROLL OUT / EFFECTIVE GEARING

A taller tire travels farther per wheel turn.

Rollout is circumference: π × tire diameter. With the same wheel RPM, a larger effective diameter covers more distance per turn. Traxxas illustrates this with 13 in versus 14 in rollouts and compensating pinion choice; its gearing guidance also warns that speed-focused gearing raises load and heat. Traxxas rollout example ↗ Traxxas gearing note ↗

Use measured loaded/effective diameter if you have it. This does not know your motor RPM, transmission, slip, tire growth, battery or heat.

Current rollout314.2 mm/rev
Comparison rollout345.6 mm/rev

10.0% farther per wheel turn. At the entered wheel RPM: 18.8 vs 20.7 km/h, mathematical only.

100 mm

Animation is illustrative and opt-in. It remains paused when reduced motion is preferred.

Carcass / insert stiffness: a useful variable, not a universal setting

Support changes how a tire holds shape and responds under load. More support can change steering feel and stability; less support can conform differently. There is no universal “better” setting: terrain, mass, speed, temperature and the rest of the setup matter. Keep the exact tire, wheel and insert together in your notes.

Model assumptions: a circular, no-slip tire; constant entered wheel RPM; the diameter supplied by the reader. The calculator reports geometry, not predicted speed, temperature, traction or compatibility.

TAKE IT TO THE BENCH

Compare the complete setup.

All 20 bench guides ↗