Out n About Nipper V6 PLUS Double vs Mountain Buggy Duet V4: Side-by-Side Showdown

COMPARISON · ON THE GO

Choosing a double pushchair is one of the biggest decisions you will make as a parent of two under four. Side-by-side models offer equal seating for both children, better visibility for you, and typically simpler folding than tandem designs. The perennial downside, width, has been tackled by the latest generation of side-by-side doubles with impressively narrow footprints.

The Out n About Nipper V6 PLUS Double and the Mountain Buggy Duet V4 are two of the most talked-about side-by-side doubles in the UK. Both promise all-terrain capability and both claim to slip through standard doorways, but they take meaningfully different approaches to get there. We compared specs, pricing and real parent feedback to help you decide which one deserves the spot in your boot.

Lil' Bubba's verdicts

• Best Overall: Out n About Nipper V6 PLUS Double · 8.5/10 - Running-certified all-terrain powerhouse for active families
• Best for Urban Flexibility: Mountain Buggy Duet V4 · 8.0/10 - The narrowest side-by-side with full travel-system compatibility

Quick comparison

	Nipper V6 PLUS Double	Duet V4
Rating
Price	£825	£699
Width	72 cm	63 cm
Weight	16.8 kg	16.8 kg
Wheels	3 × 12" air-filled	4 × 10" air-filled
Running certified	Yes (BS EN1888-3)	No
Car seat compatible	No	Yes
Fold	One-hand, flat	One-hand, standing or flat
Best for	Active families, joggers	Urban parents, travel systems

How we picked these two

We looked at every side-by-side double pushchair currently available through UK retailers, filtered by parent popularity and verified in-stock status, then compared real-world feedback from parents and expert reviewers. The Nipper V6 PLUS Double and the Duet V4 stood out as the two strongest all-terrain side-by-side options at the premium end of the market, making this a natural head-to-head.

What to look for in a side-by-side double pushchair

Width matters more than you think. Standard UK doorways are 76 cm wide. Any side-by-side under 72 cm will glide through most doors and shop aisles without a second thought. Above 75 cm and you will start catching door frames regularly.

Wheel size and type determine your terrain range. Larger air-filled tyres (12 inches and above) handle gravel, grass and uneven pavement confidently. Smaller wheels are lighter and more agile on flat surfaces. If you live near parks, beaches or countryside trails, bigger wheels are worth the extra weight.

Car seat compatibility is a dealbreaker for some families. If your daily routine involves driving to a destination and clicking the car seat straight onto the pushchair frame, check compatibility before you buy. Not all side-by-side doubles accept infant car seats.

Fold size determines your boot life. A double pushchair that folds standing-upright can lean against a boot wall. A flat fold sits low but takes floor space. Measure your boot and check the folded dimensions, not just the marketing claim.

Independent seat recline is non-negotiable. Children nap at different times. Both seats should recline independently so a sleeping toddler is not disturbed when you sit the other child upright for a snack.

1. Out n About Nipper V6 PLUS Double / 10 · Best for Active Families

The Nipper V6 PLUS Double is the first double pushchair to earn official running certification under the BS EN1888-3:2023 standard. That alone puts it in a category of one. But even if you never plan to jog, its three 12-inch air-filled tyres, dual braking system and independent seat recline make it a seriously capable all-rounder for everyday life with two children.

At 72 cm wide, it fits through standard doorways with a few centimetres to spare. The one-hand fold drops it flat to just 34 cm tall, small enough to slide under other items in your boot. Parents we hear from consistently praise how stable it feels on rough ground. One parent put it best: "It glided over our farm track without a wobble."

What parents love

• Running certified. The only double pushchair officially tested and approved for jogging, with a swivel-lock front wheel and handlebar handbrake for downhill control.
• All-terrain confidence. The 12-inch tyres handle gravel, mud, sand and cobblestones with ease. A parent shared: "We take it to the beach every weekend and it just powers through."
• Dual braking system. A flip-flop-friendly foot brake plus a handlebar handbrake gives you complete speed control on hills.
• One-hand fold. Folds flat in seconds, no need to remove wheels. Parents we hear from regularly say the fold is one of the best in the double pushchair category.

What to know before you buy

• No car seat compatibility. You cannot attach an infant car seat to this frame, which rules it out as a birth-ready travel system.
• Forward-facing only. There is no parent-facing recline option, so younger babies face away from you at all times.
• Air tyres need maintenance. You will need a pump and occasionally a puncture repair kit. One parent told us: "We keep a mini pump in the basket - it only takes a minute."

Best for

• Parents who jog or run with their children
• Active families who walk on trails, beaches and rough terrain
• Anyone who values a flat, compact fold for smaller car boots
• Families who do not need car seat attachment

2. Mountain Buggy Duet V4 / 10 · Best for Urban Flexibility

The Mountain Buggy Duet V4 holds the crown for the narrowest side-by-side double on the market at just 63 cm wide, narrower than many single pushchairs. Built from aircraft-grade 6060 T52 aluminium, it feels solid without being heavy, tipping the scales at the same 16.8 kg as the Nipper. The Duet is built for families who need maximum versatility: it accepts carrycots, cocoons and infant car seats, making it a genuine birth-ready travel system.

Its four 10-inch air-filled tyres offer respectable all-terrain performance, though the smaller diameter means you will notice bigger bumps more than with 12-inch wheels. The active handbrake with a go/stop indicator is a clever touch. We hear repeatedly from parents that the width is the standout feature. One parent told us: "It fits everywhere a single pushchair goes, which changes everything when you have two."

What parents love

• Incredibly narrow. At 63 cm, it slips through doorways, supermarket aisles and cafe gaps that would stop wider doubles. A parent shared: "I forget it is a double sometimes."
• Full travel-system compatibility. Accepts up to two carrycots or two infant car seats, giving you genuine from-birth versatility without needing a separate frame.
• Lie-flat seats from birth. The sling seats recline fully flat, with an inclined mode designed for babies with reflux.
• Aircraft-grade aluminium frame. Parents we hear from regularly praise the durability. One parent told us: "It has been in constant use for two years with very little sign of wear."

What to know before you buy

• Smaller wheels. The 10-inch tyres handle paths and grass well but do not match the off-road confidence of 12-inch wheels on sand, mud or rough trails.
• Narrower seat width. Each seat is 29 cm wide internally. Larger toddlers in bulky winter coats may find it snug.
• Standing fold is taller. The standing fold measures 89 cm tall, which may not slide under a parcel shelf in smaller boots.

Best for

• Urban parents who navigate narrow spaces daily
• Families who want car seat and carrycot compatibility from birth
• Parents of twins who need identical, flexible seating configurations
• Anyone prioritising a narrower footprint over off-road performance

How to choose

Choose the Out n About Nipper V6 PLUS Double if your weekends involve park trails, beach walks or actual jogging with two children. Its running certification, 12-inch wheels and dual braking system are unmatched in the side-by-side category. You will sacrifice car seat compatibility, so you will need a separate solution for the first few months.

Choose the Mountain Buggy Duet V4 if daily life means navigating tight shop doorways, cafe tables and public transport barriers. Its 63 cm width genuinely changes what is possible with a double pushchair. Full travel-system compatibility means you can build a complete birth-to-toddler setup around a single frame, saving money and boot space long term.

Both are excellent pushchairs built by brands with deep heritage in the double category. The price gap favours the Duet, which may matter if you are also budgeting for carrycots or car seats to go with it. If terrain is your priority, the Nipper PLUS is worth every penny of the premium.

Add it to your Nest

Whichever double suits your family, add it to your free BubsNest registry so friends and family can chip in on the big purchase. Double pushchairs are the perfect registry item: expensive enough that group gifting makes a real difference.