# RUPES BigFoot LHR21 Mark III Random Orbital Polisher vs Meguiar's MT300 Professional DA Polisher: specs and price compared

A sourced, side-by-side comparison of the RUPES BigFoot LHR21 Mark III Random Orbital Polisher (RUPES) and Meguiar's MT300 Professional DA Polisher (Meguiar's) among car polishers. Meguiar's MT300 Professional DA Polisher is the cheaper of the two at $286.99.

## Side by side

| Spec | RUPES BigFoot LHR21 Mark III Random Orbital Polisher | Meguiar's MT300 Professional DA Polisher |
| --- | --- | --- |
| US price | $490 | $286.99 |
| Brand | RUPES | Meguiar's |
| Released | 2018-11 | 2014 |
| Orbit throw (mm) | 21 | 8 |
| Motor power | 500 W | 4.5 A |
| Speed range opm | 3,000-4,500 | 3,000-7,500 |
| Backing plate size (in) | 6 in | 3 in / 5 in / 6 in |
| Variable speed | Yes | Yes |
| Action type | free-spin dual-action (random orbital, not gear-driven) | gear-driven dual-action (forced rotation, Digital Torque Management) |
| Cord length (ft) | 30 | — |
| Weight (lb) | 5.95 | 5.4 |

## Key differences

- Orbit throw (mm): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 21 vs Meguiar's MT300 Professional DA Polisher 8
- Motor power: RUPES BigFoot LHR21 Mark III Random Orbital Polisher 500 W vs Meguiar's MT300 Professional DA Polisher 4.5 A
- Speed range opm: RUPES BigFoot LHR21 Mark III Random Orbital Polisher 3,000-4,500 vs Meguiar's MT300 Professional DA Polisher 3,000-7,500
- Backing plate size (in): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 6 in vs Meguiar's MT300 Professional DA Polisher 3 in / 5 in / 6 in
- Action type: RUPES BigFoot LHR21 Mark III Random Orbital Polisher free-spin dual-action (random orbital, not gear-driven) vs Meguiar's MT300 Professional DA Polisher gear-driven dual-action (forced rotation, Digital Torque Management)
- Weight (lb): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 5.95 vs Meguiar's MT300 Professional DA Polisher 5.4

## Sources

- RUPES BigFoot LHR21 Mark III Random Orbital Polisher: https://www.rupes.com/product/lhr21iii/ (rupes.com, verified 2026-08-01)
- Meguiar's MT300 Professional DA Polisher: https://www.meguiars.com/automotive/products/meguiarsr-mt300-professional-da-polisher-mt300 (meguiars.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/car-polishers/rupes-bigfoot-lhr21-mark-iii-vs-meguiars-mt300/
Cite: Per The Front Desk Review, RUPES BigFoot LHR21 Mark III Random Orbital Polisher ($490) vs Meguiar's MT300 Professional DA Polisher ($286.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-polishers/rupes-bigfoot-lhr21-mark-iii-vs-meguiars-mt300/
License: CC BY 4.0.