If you’re trying to decide between the RUPES LHR15 Mark V and the RUPES LHR21 Mark V, you’re already looking at two of the most capable dual action polishers you can buy in 2026. The “right” choice isn’t about which one is better overall—it’s about what you polish most, how tight your panels and curves are, and how fast you want to cover large surfaces.
In this guide, I’m going to break down the real-world differences between the 15 mm and 21 mm throw: where each machine shines, where each one can feel awkward, and what I’d recommend if you want one tool… or a setup that scales.
Shop both options at Auto Premium Supply: Browse Dual Action Polishers
Quick answer (if you want the decision in 20 seconds)
- Choose the LHR15 Mark V if you want the best “one machine does almost everything” DA—especially for mixed panel shapes, tighter curves, and daily-driver correction.
- Choose the LHR21 Mark V if you prioritize speed on large, flatter panels (SUVs, trucks, big hoods/roofs) and you want maximum coverage per pass.
Buy links: RUPES LHR15 Mark V | RUPES LHR21 Mark V
Comparison table: LHR15 Mark V vs LHR21 Mark V
| Feature | RUPES LHR15 Mark V | RUPES LHR21 Mark V |
|---|---|---|
| Orbit (throw) | 15 mm | 21 mm |
| Backing plate | 125 mm (5") | 150 mm (6") |
| Power | 500 W | 500 W |
| Speed range | 3000–5200 RPM | 3000–4500 RPM |
| Weight | 2.35 kg (5.18 lbs) | 2.44 kg (5.38 lbs) |
| Cable length | 9 m (30') | 9 m (30') |
| Best for | All-around correction + control on mixed panels | Fast coverage on large, flatter panels |
| Feels easiest on | Curves, tighter areas, smaller vehicles | Hoods, roofs, doors, large SUVs/trucks |
| If you only buy ONE | Most people should start here | Best if your work is mostly big vehicles |
The real difference: 15 mm vs 21 mm throw (and why it matters)
The “throw” is what defines how each machine behaves.
- 21 mm throw (LHR21V): covers more area per pass. That usually means faster correction on big panels—especially when you’re doing full paint corrections on SUVs, trucks, and large sedans.
- 15 mm throw (LHR15V): still corrects quickly, but feels more “balanced” on complex shapes. It’s typically easier to keep stable on body lines, curves, and tighter panels.
Here’s the key: a larger throw is not automatically better. It’s better when you can keep the machine flat and stable. When you’re working near sharp contours, tight curves, or crowded areas, the 15 mm platform tends to feel more cooperative and consistent.
Which one is faster in real life?
On large, flatter panels (hoods, roofs, big doors), the LHR21 Mark V is usually faster—no mystery there. The larger throw and larger backing plate combo can help you move quicker with fewer passes.
But once you move to curvier areas—tight bumpers, aggressive fenders, sharp body lines, pillars—the gap often shrinks. If you can’t keep the pad stable and flat, you end up doing extra cleanup passes anyway, and that’s where the LHR15 Mark V often feels more efficient overall.
Control, comfort, and “how tiring it feels”
Both Mark V polishers were designed around smoother operation and improved comfort. In practice, the difference comes from size and how it fits your workflow:
- LHR15 Mark V: tends to feel more natural across a wider variety of panels. If you do a little of everything, this “balanced” feel matters.
- LHR21 Mark V: feels amazing when you’re cruising on big panels—but can feel bulkier on tight curves and smaller vehicles.
If you’re polishing frequently (or professionally), comfort isn’t a luxury—it’s productivity. The less you fight the machine, the cleaner your results and the faster you move.
Best use cases (what each machine is made for)
Choose the RUPES LHR15 Mark V if you mainly do:
- Daily drivers with mixed panel shapes (curves + flat sections)
- Mid-size sedans, coupes, sports cars, and compact SUVs
- One-step enhancements where you want control and consistent finishing
- Work around body lines, sculpted doors, tighter bumpers
Buy: RUPES LHR15 Mark V
Choose the RUPES LHR21 Mark V if you mainly do:
- SUVs, trucks, vans, and larger vehicles
- Full corrections where speed on large panels is a priority
- High-volume work where “coverage per pass” saves real time
- Big, flatter areas like hoods, roofs, and wide doors
Buy: RUPES LHR21 Mark V
My recommendation (based on how most people actually polish)
If you want ONE DA that does almost everything
Get the LHR15 Mark V. It’s the safest “no regrets” choice because it performs across the widest range of panel shapes and vehicle sizes.
If you’re mostly doing big vehicles or you care most about speed
Get the LHR21 Mark V. When your work is dominated by big, open panels, this machine can genuinely speed up your correction process.
If you want a “dream team” setup
For pros or serious enthusiasts, a very common strategy is:
- LHR21 Mark V for fast work on big panels
- LHR15 Mark V for more controlled work on curves and tighter areas
Shop Rupes Polishers at Auto Premium Supply
Pick the exact Rupes machine for your workflow—cutting power, finishing clarity, or compact iBrid precision. Click any model below to view details and buy.
Rupes BigFoot LHR15ES
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Rupes BigFoot LHR75E Mini
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Rupes LH19E Rotary Polisher
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Rupes LHR15V Mark V
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iBrid Nano Long Neck Box Kit (HR81ML/LUX)
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iBrid Basic Kit (HLR15/CB2/BAS)
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Rupes BigFoot LHR21ES
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HLR75/STB Mini iBrid (2 Batteries + Charger)
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HLR75/BETA Mini iBrid Kit
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iBrid Basic Kit (HLR21/CB2/BAS)
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Rupes LHR21V Mark V
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Rupes BigFoot LHR12E Duetto
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HLR15/CB2/STD Standard Kit
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BigFoot LHR15 Mark V Complete Kit
Shop now →Rupes LHR15V Mark V Starter Kit
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Rupes LK900E Mille
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iBrid Nano Short Neck Box Kit (HR81M/LUX)
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Nano Long Neck Starter Kit (HR81ML/STP)
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Nano iBrid Short Neck Starter Kit (HR81M/US/STB)
Shop now →Pro tip: if you’re unsure which Rupes fits your workflow, start with orbit size (15mm vs 21mm) and the panels you polish most.
FAQ
Is the RUPES LHR21 Mark V better than the LHR15 Mark V?
Not universally. The LHR21 Mark V is typically faster on large, flatter panels, while the LHR15 Mark V is more balanced across curves and mixed panel shapes. The “better” choice depends on what you polish most.
Which one is easier for beginners: LHR15 or LHR21 Mark V?
Most beginners find the LHR15 Mark V easier as an all-around tool because it feels more controllable on varied panel shapes.
Do I need the LHR21 Mark V if I already have the LHR15 Mark V?
If you regularly correct large SUVs/trucks and want faster coverage on big panels, adding the LHR21 can make sense. If your work is mostly average-size vehicles and tighter body shapes, the LHR15 alone is often enough.
Can the LHR21 Mark V finish as well as the LHR15 Mark V?
Yes—both can finish extremely well. The main difference is how they feel on complex shapes. The LHR15 is typically easier to keep stable on curves, which can make finishing feel more effortless on tighter areas.
