Our verdict
The bigger Kubota for half-acre to acre estate lawns. Deeper deck and bigger engine than the GR1600-II — cuts in fewer passes. Worth the upgrade only if your lawn justifies it; for most domestic buyers the GR1600 is plenty.
Pros & cons
Pros
- 122cm deck covers serious ground fast
- 21HP V-twin handles long grass
- Same Glide Steer system
- Built to the same standard as the GR1600
Cons
- Truly serious money
- Heavier than the GR1600 at 380kg
- Kubota dealer network limited
Full specs
| Type | Ride-on |
|---|---|
| Cut width | 122 cm |
| Engine / Power | Kubota WG972 V-twin petrol 21HP |
| Weight | 380 kg |
| Deck | Steel |
| Self-propelled | Yes |
| Rear roller | No |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | 330 L |
| Suited to lawn | Large |
| Noise level | 100 dB |
Buying second-hand
£3500–5200 used. Same Kubota service-history premium. Engine hours under 500 excellent. Hydrostatic drive belt slip under load is the most common ride-on fault — test on an incline. Glide Steer mechanism oil change is part of regular service.
Where to buy the Kubota GR2120-II
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Repair-cost reference
UK 2026 ballpark prices for the parts you're most likely to need on this mower. OEM is dealer-genuine; aftermarket is what you'll find on eBay or generic small-engine suppliers. Use these to sense-check any quote and to negotiate on used buys.
| Part / job | OEM | Aftermarket |
|---|---|---|
|
Replacement 122cm blade
Annual sharpening is free; replace when bent or cracked.
|
£24–£32 | £8–£12 |
|
Oil filter
|
£12 | £6 |
|
Air filter set
|
£28 | £14 |
|
Spark plug pair
|
£10 | £4 |
|
Deck spindle bearing
Replace if blade vibrates or the deck whines under load.
|
£48 each | £22 each |
|
Transaxle service (gear oil change)
Hydrostatic units need fresh fluid every 200 hours.
|
£60 dealer | £15 DIY |
|
12V starter battery
Generic 12V 18Ah lawn-tractor battery — fits most ride-ons.
|
£45 | £28 |
Fair-offer calculator
Tell us about a specific used listing for the Kubota GR2120-II you're looking at. We'll compute a fair offer range from our used-market data and the condition signals you provide.
Calculations are guidance, not gospel. Used-market prices vary by region (Scotland is typically 10–15% cheaper than the South-East), season (October cheapest, March most expensive), and seller motivation.
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