# RUPES BigFoot LHR21 Mark III Random Orbital Polisher vs SPTA DA501-US 5in/6in Dual Action Polisher Kit: specs and price compared

A sourced, side-by-side comparison of the RUPES BigFoot LHR21 Mark III Random Orbital Polisher (RUPES) and SPTA DA501-US 5in/6in Dual Action Polisher Kit (SPTA) among car polishers.

## Side by side

| Spec | RUPES BigFoot LHR21 Mark III Random Orbital Polisher | SPTA DA501-US 5in/6in Dual Action Polisher Kit |
| --- | --- | --- |
| US price | $490 | not published |
| Brand | RUPES | SPTA |
| Released | 2018-11 | — |
| Orbit throw (mm) | 21 | 9 |
| Motor power | 500 W | 780 W |
| Speed range opm | 3,000-4,500 | 2,000-5,500 |
| Backing plate size (in) | 6 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, budget import) |
| Cord length (ft) | 30 | — |
| Weight (lb) | 5.95 | 4.4 |

## Key differences

- Orbit throw (mm): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 21 vs SPTA DA501-US 5in/6in Dual Action Polisher Kit 9
- Motor power: RUPES BigFoot LHR21 Mark III Random Orbital Polisher 500 W vs SPTA DA501-US 5in/6in Dual Action Polisher Kit 780 W
- Speed range opm: RUPES BigFoot LHR21 Mark III Random Orbital Polisher 3,000-4,500 vs SPTA DA501-US 5in/6in Dual Action Polisher Kit 2,000-5,500
- Backing plate size (in): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 6 in vs SPTA DA501-US 5in/6in Dual Action Polisher Kit 5 in / 6 in
- Action type: RUPES BigFoot LHR21 Mark III Random Orbital Polisher free-spin dual-action (random orbital, not gear-driven) vs SPTA DA501-US 5in/6in Dual Action Polisher Kit gear-driven dual-action (forced rotation, budget import)
- Weight (lb): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 5.95 vs SPTA DA501-US 5in/6in Dual Action Polisher Kit 4.4

## Sources

- RUPES BigFoot LHR21 Mark III Random Orbital Polisher: https://www.rupes.com/product/lhr21iii/ (rupes.com, verified 2026-08-01)
- SPTA DA501-US 5in/6in Dual Action Polisher Kit: https://www.amazon.com/SPTA-Polisher-Detailing-Polishing-DA501-US/dp/B09Y2WM37L (amazon.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/car-polishers/rupes-bigfoot-lhr21-mark-iii-vs-spta-da501-us/
Cite: Per The Front Desk Review, RUPES BigFoot LHR21 Mark III Random Orbital Polisher ($490) vs SPTA DA501-US 5in/6in Dual Action Polisher Kit (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-polishers/rupes-bigfoot-lhr21-mark-iii-vs-spta-da501-us/
License: CC BY 4.0.