# RUPES BigFoot LHR21 Mark III Random Orbital Polisher vs Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher: specs and price compared

A sourced, side-by-side comparison of the RUPES BigFoot LHR21 Mark III Random Orbital Polisher (RUPES) and Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher (Porter-Cable) among car polishers. Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher is the cheaper of the two at $159.

## Side by side

| Spec | RUPES BigFoot LHR21 Mark III Random Orbital Polisher | Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher |
| --- | --- | --- |
| US price | $490 | $159 |
| Brand | RUPES | Porter-Cable |
| Released | 2018-11 | — |
| Orbit throw (mm) | 21 | 16 |
| Motor power | 500 W | 4.5 A |
| Speed range opm | 3,000-4,500 | 2,500-6,800 |
| Backing plate size (in) | 6 in | 6 in |
| Variable speed | Yes | Yes |
| Action type | free-spin dual-action (random orbital, not gear-driven) | gear-driven dual-action (forced rotation, ball & roller bearing) |
| Cord length (ft) | 30 | 7 |
| Weight (lb) | 5.95 | 5.8 |

## Key differences

- Orbit throw (mm): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 21 vs Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher 16
- Motor power: RUPES BigFoot LHR21 Mark III Random Orbital Polisher 500 W vs Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher 4.5 A
- Speed range opm: RUPES BigFoot LHR21 Mark III Random Orbital Polisher 3,000-4,500 vs Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher 2,500-6,800
- Action type: RUPES BigFoot LHR21 Mark III Random Orbital Polisher free-spin dual-action (random orbital, not gear-driven) vs Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher gear-driven dual-action (forced rotation, ball & roller bearing)
- Cord length (ft): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 30 vs Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher 7
- Weight (lb): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 5.95 vs Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher 5.8

## Sources

- RUPES BigFoot LHR21 Mark III Random Orbital Polisher: https://www.rupes.com/product/lhr21iii/ (rupes.com, verified 2026-08-01)
- Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher: https://www.portercable.com/product/7424xp/6-variable-speed-random-orbit-polisher (portercable.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/car-polishers/rupes-bigfoot-lhr21-mark-iii-vs-porter-cable-7424xp/
Cite: Per The Front Desk Review, RUPES BigFoot LHR21 Mark III Random Orbital Polisher ($490) vs Porter-Cable 7424XP 6 in. Variable-Speed Random Orbit Polisher ($159) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-polishers/rupes-bigfoot-lhr21-mark-iii-vs-porter-cable-7424xp/
License: CC BY 4.0.