At a glance
Ryobi’s ONE+ 18V platform is the most accessible cordless tool ecosystem available to UK buyers – a huge range of tools at DIY-friendly prices all sharing the same battery. The R18AG-0 is Ryobi’s 125mm angle grinder in the ONE+ range, it is significantly cheaper than the professional-grade options from DeWalt, Milwaukee and Bosch in this test. For a full comparison with the premium brands, see our best cordless angle grinders UK guide.
The central question for the R18AG-0 is whether it delivers enough performance for typical DIY applications to justify choosing it over a corded budget grinder, and how it holds up against the brushless professional models at more than double the price. The answer involves some genuine trade-offs that are worth understanding before buying.
Overview and first impressions
The R18AG-0 is compact and lighter than the professional 125mm grinders in this test – around 1.6kg body only, which makes it noticeably more wieldy than the Bosch GWS 18V-10 for overhead work or prolonged use. The green and black Ryobi styling is distinctive, and the build feels solid for the price point, though the plastics are a step below the professional-grade tools in finish quality.
The side handle is a standard rigid type with no vibration dampening – expected at this price. The guard is functional and adjustable. The sliding power switch with lock-off is straightforward and easy to operate, including with gloves. Disc changes via the spindle lock work cleanly.
There are no advanced safety systems – no kickback brake, no disc brake, no electronic overload monitoring. This is standard for tools in this price bracket and means the safety responsibility rests entirely with the operator and correct technique. Anyone new to angle grinders who is considering this tool should take the time to understand proper grinder safety before use.
No kickback brake is fitted. The R18AG-0 does not include automatic kickback protection. Always maintain a firm two-handed grip, wear appropriate PPE, and use the disc guard at all times. Angle grinders are dangerous tools – correct technique is non-negotiable regardless of the model being used.
Specifications and scores
How it performed in our tests
For light DIY metalwork the R18AG-0 performs adequately. Cutting through 6mm mild steel flat bar is handled without drama, and light weld dressing and surface preparation on thin material work fine. The brushed motor drops speed under load more noticeably than the brushless professional tools, and on thicker material the difference becomes apparent. Cutting 10mm steel bar takes longer and the motor runs noticeably warmer than the professional models on the same task.
For occasional home use – cutting bolts, trimming small metal sections, light grinding – the R18AG-0 delivers results. It is not a tool for sustained heavy use, and expecting professional-grade performance from a budget brushed grinder will lead to disappointment and potentially a shorter tool lifespan.
Let the tool cool between heavy cuts. The brushed motor generates more heat than brushless equivalents. For sustained cutting allow the R18AG-0 rest periods to avoid overheating. This is normal practice for brushed tools at this price point.
Battery system and runtime
The R18AG-0 uses Ryobi’s ONE+ 18V battery, compatible with over 100 tools across the ONE+ range. This is the platform’s greatest strength – the ability to share batteries across a large collection of affordable tools. Runtime is shorter than brushless alternatives on equivalent battery capacity, which is expected from a brushed motor.
The 5Ah is the best everyday choice for any meaningful session – the 2Ah runs short quickly on sustained cutting and is best kept as a backup or for very light tasks. The 6Ah delivers maximum runtime but adds noticeable front weight on a tool already positioned as lightweight and manoeuvrable.
Performance and limitations
The R18AG-0’s limitations are those of any budget brushed grinder – shorter runtime, less power under load, more heat generation and a shorter expected motor lifespan under heavy use. These are not flaws for a tool at this price point. Understanding what the tool is designed for – occasional DIY metalwork – sets realistic expectations.
The absence of any safety electronics is the more meaningful consideration. No kickback brake, no disc brake, no overload protection. For experienced users these are not necessarily deal-breakers – corded grinders at twice the price often lack these features too. For newer users or those working in confined spaces where a kickback event is more dangerous, the modest additional cost of a brushless model with kickback protection is worth serious consideration.
- Excellent value – lowest price 125mm grinder in this test
- ONE+ battery compatibility across 100+ Ryobi tools
- Lightweight and easy to manoeuvre
- Adequate for light DIY metalwork and occasional cutting
- Brushed motor – shorter runtime and lower power under load
- No kickback brake or disc brake safety systems
- Not suited to sustained heavy professional use
- Existing Ryobi ONE+ platform users
- Occasional DIY metalwork and cutting
- Budget-conscious home users
- Light cutting tasks on thin material
- Professional or trade use
- Sustained heavy cutting and grinding
- Those needing kickback safety protection
Final verdict – is it worth it?
The Ryobi R18AG-0 delivers on its core promise – an affordable, functional angle grinder for occasional DIY metalwork that shares batteries with a large ecosystem of ONE+ tools. It is the most accessible entry point to cordless grinding in this test, and for an existing ONE+ user who needs a grinder for occasional light tasks it makes straightforward sense.
The honest comparison against the professional brushless models is stark in terms of raw performance and safety features, but it is also an unfair comparison given the price difference. The Ryobi is not trying to be a DeWalt DCG405 – it is a budget tool for budget applications, and within that context it does its job adequately.
Where it struggles is when buyers underestimate their actual requirements. If you find yourself regularly cutting thick steel or using the grinder for extended sessions, you will quickly outgrow the R18AG-0 and wish you had spent more. Be honest about your use case before buying – occasional light cutting warrants the Ryobi, anything more frequent or demanding warrants a brushless professional model.
A capable budget grinder for light DIY metalwork within the ONE+ ecosystem. Performance is adequate for occasional use on thin material, but the brushed motor and absence of safety electronics mean it is not suitable for trade use or sustained heavy cutting. Good value for what it is – be realistic about what you need it for.
Share on socials:
