Maxshine M21 Pro
The lowest-priced 21 mm polisher from a detailing brand, for quick correction on large vehicles.
Amazon $258.99$258.99
The Maxshine M21 Pro and the RUPES BigFoot LHR21 Mark V are evenly matched, rated 3.4 and 3.4. The Maxshine M21 Pro leads on value and power. The RUPES BigFoot LHR21 Mark V wins on warranty and features. The Maxshine M21 Pro costs $335.01 less ($258.99 vs $594).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
RUPES BigFoot LHR21 Mark V
A 21 mm polisher for big, flat panels on trucks, vans and boats, for professionals who already own a smaller machine for tight spots.
Amazon $594$594
Which should you buy?
- Choose the Maxshine M21 Pro for value ($258.99 vs $594) and power (1,000 W vs 500 W).
- Choose the RUPES BigFoot LHR21 Mark V for warranty (5-year warranty vs 1-year warranty) and features (cordless or a 20 ft+ cord vs none of the listed features).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every corded long-throw dual action car polisher; a clear win is highlighted. How we rank explains each one.
| Factor weight | Maxshine M21 Pro | RUPES BigFoot LHR21 Mark V |
|---|---|---|
| Overall rating | 3.4/5 | 3.4/5 |
| Correction 30% | 100 21 mm orbit | 100 21 mm orbit |
| Value 25% | 47 $258.99 | 1 $594 |
| Warranty 15% | 0 1-year warranty | 100 5-year warranty |
| Power 10% | 86 1,000 W | 14 500 W |
| Weight 10% | 50 weight not published (neutral score used) | 66 5.4 lb |
| Features 10% | 0 none of the listed features | 15 cordless or a 20 ft+ cord |
Specifications
| Maxshine M21 Pro | RUPES BigFoot LHR21 Mark V | |
|---|---|---|
| Polishing | ||
| Orbit diameter | 21 mm | 21 mm |
| Speed range | 2,200-5,000 OPM | 3,000-4,500 OPM |
| Backing plate | 6 in | 6 in |
| Forced rotation | No | No |
| Power | ||
| Power source | Corded | Corded |
| Motor rating | 1,000 W | 500 W |
| Cord | - | 30 ft |
| Brushless motor | Not listed | Not listed |
| Controls | ||
| Constant-speed electronics | Not listed | Not listed |
| Soft start | Not listed | Not listed |
| Lock-on trigger | Not listed | Not listed |
| Build | ||
| Weight | - | 5.4 lb |
| Pads or polish included | No | No |
| Warranty | 1 year | 5 years |