Mountfield S421R PD Petrol Lawn Mower (41cm Rear Roller, Self Propelled)

The Mountfield S421R PD petrol lawn mower is one of the best rear roller mowers for creating classic striped lawns in small to medium UK gardens.

With a 41cm cutting width, self-propelled drive, and reliable 139cc STIGA engine, it delivers the perfect balance of precision, power, and ease of use.

Available now from Masseys in Swadlincote, this model is ideal for homeowners who want a professional finish without the bulk of larger machines.

See all of our lawn mowers or specifically Mountfield petrol mowers.

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Key Features of the Mountfield S421R PD

• Self-propelled drive – reduces effort, especially on slopes
• Rear roller system – creates traditional striped lawn finish
• 139cc STIGA ST140 engine – reliable, easy-start petrol performance
• 41cm cutting width – ideal for smaller lawns and tight access
• 55L grass collector – fewer stops when mowing
• Central height adjustment (20–70mm) – adaptable to all seasons
• Steel chassis construction – durable for long-term use

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Who Is This Lawn Mower Best For?

The S421R PD is ideal if you:

• Have a small to medium garden (up to ~400m²)
• Want defined lawn stripes
• Prefer a petrol mower with more power than cordless
• Need easy handling around borders and tight spaces
• Want self-propelled convenience

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Real-World Performance

At Masseys, we regularly prepare and service Mountfield machines in our workshop.

From experience:

• The STIGA engine is one of the most reliable entry-level petrol engines
• The rear roller improves edge stability, especially along borders
• The 41cm deck is easier to control than wider models, making it better for detailed lawns

Practical takeaway:
This mower is about finish quality and control, not speed.

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Mountfield S421R PD vs S461R PD – Which Should You Choose?

Here’s the key comparison buyers actually need:

Verdict:

• Choose S421R PD if you want:
  • Better control
  • Smaller garden usability
  • Lower cost
• Choose S461R PD if you want:
  • Faster mowing
  • More power
  • Larger lawn coverage

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Why Buy from Masseys?

When you buy from Masseys, you get more than just the machine:

• Family-run UK business with decades of experience
• Workshop setup available (oil + fuel ready to use)
• Local delivery & support
• Aftercare, servicing & warranty support
• Real in-store advice (not just box-shifting)

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FAQs

Is the Mountfield S421R PD good for stripes?

Yes — the full-width rear roller creates classic striped lawn patterns.

Can it handle long or wet grass?

Yes, the 139cc engine provides strong torque for typical UK conditions.

Is this mower easy to use?

Very — the self-propelled system removes the need to push.

What size lawn is it suitable for?

Best for small to medium gardens up to ~20m x 20m.

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Related Mountfield Roller Mowers at Masseys

• Mountfield S461R PD – Larger rear roller and self-propelled drive

• Mountfield Princess 38 Li – cordless striping mower with rear roller

The Mountfield S421R PD remains one of the best-value domestic roller petrol mowers in the UK — reliable, powerful and capable of producing a lawn finish that you’ll be proud of.