RUPES
RUPES BigFoot LHR21 Mark III Random Orbital Polisher
$490
Released 2018-11
Best Car Polishers · head-to-head
RUPES BigFoot LHR21 Mark III Random Orbital Polisher vs SPTA DA501-US 5in/6in Dual Action Polisher Kit
A sourced, side-by-side comparison. RUPES BigFoot LHR21 Mark III Random Orbital Polisher is cheaper at $490. Every spec and price links to its source.
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SPTA
SPTA DA501-US 5in/6in Dual Action Polisher Kit
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Which is better: the RUPES BigFoot LHR21 Mark III Random Orbital Polisher or SPTA DA501-US 5in/6in Dual Action Polisher Kit?
The SPTA DA501-US 5in/6in Dual Action Polisher Kit wins 1 of the 1 specs we compare head to head; the other wins 0.
See RUPES BigFoot LHR21 Mark III Random Orbital Polisher on Amazon Check SPTA DA501-US 5in/6in Dual Action Polisher Kit price
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | RUPES BigFoot LHR21 Mark III Random Orbital Polisher | SPTA DA501-US 5in/6in Dual Action Polisher Kit |
|---|---|---|
| US price | $490 | — |
| 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 |
Sources — RUPES BigFoot LHR21 Mark III Random Orbital Polisher: rupes.com (verified 2026-08-01). SPTA DA501-US 5in/6in Dual Action Polisher Kit: amazon.com (verified 2026-08-01).
What's the difference between the RUPES BigFoot LHR21 Mark III Random Orbital Polisher and SPTA DA501-US 5in/6in Dual Action Polisher Kit?
Where the two actually differ on the specs we track (6 of 8). Matching specs are omitted.
- 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