# RUPES BigFoot LHR21 Mark III Random Orbital Polisher vs Flex XFE 7-15 150 Random Orbital Polisher: specs and price compared

A sourced, side-by-side comparison of the RUPES BigFoot LHR21 Mark III Random Orbital Polisher (RUPES) and Flex XFE 7-15 150 Random Orbital Polisher (Flex) among car polishers. Flex XFE 7-15 150 Random Orbital Polisher is the cheaper of the two at $425.

## Side by side

| Spec | RUPES BigFoot LHR21 Mark III Random Orbital Polisher | Flex XFE 7-15 150 Random Orbital Polisher |
| --- | --- | --- |
| US price | $490 | $425 |
| Brand | RUPES | Flex |
| Released | 2018-11 | — |
| Orbit throw (mm) | 21 | 15 |
| Motor power | 500 W | 710 W |
| Speed range opm | 3,000-4,500 | 3,000-9,000 |
| Backing plate size (in) | 6 in | 6 in |
| Variable speed | Yes | Yes |
| Action type | free-spin dual-action (random orbital, not gear-driven) | free-spin dual-action (random orbital, not gear-driven) |
| Cord length (ft) | 30 | — |
| Weight (lb) | 5.95 | 8.8 |

## Key differences

- Orbit throw (mm): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 21 vs Flex XFE 7-15 150 Random Orbital Polisher 15
- Motor power: RUPES BigFoot LHR21 Mark III Random Orbital Polisher 500 W vs Flex XFE 7-15 150 Random Orbital Polisher 710 W
- Speed range opm: RUPES BigFoot LHR21 Mark III Random Orbital Polisher 3,000-4,500 vs Flex XFE 7-15 150 Random Orbital Polisher 3,000-9,000
- Weight (lb): RUPES BigFoot LHR21 Mark III Random Orbital Polisher 5.95 vs Flex XFE 7-15 150 Random Orbital Polisher 8.8

## Sources

- RUPES BigFoot LHR21 Mark III Random Orbital Polisher: https://www.rupes.com/product/lhr21iii/ (rupes.com, verified 2026-08-01)
- Flex XFE 7-15 150 Random Orbital Polisher: https://www.flexpowertools.com/random-orbital-polisher-436712/ (flexpowertools.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/car-polishers/rupes-bigfoot-lhr21-mark-iii-vs-flex-xfe-7-15-150/
Cite: Per The Front Desk Review, RUPES BigFoot LHR21 Mark III Random Orbital Polisher ($490) vs Flex XFE 7-15 150 Random Orbital Polisher ($425) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/car-polishers/rupes-bigfoot-lhr21-mark-iii-vs-flex-xfe-7-15-150/
License: CC BY 4.0.