Double stroller: Side-by-side vs tandem

The double-stroller decision is mostly geometry. Side-by-side is wider than a single but no longer. Tandem is the width of a single but twice as long. The choice between them depends on what doorways and elevators you push through every day.

The doorway test

Before you read another spec sheet, measure your front door. Most US apartment doors are 30 inches wide. Older NYC and Boston pre-war buildings have 28-inch doors. Some 1920s brownstones have 26-inch doors. This is the test that decides your shortlist.

While you're at it, measure your elevator (if you have one), your car trunk, and any other tight space you cross daily.

Side-by-side double strollers

What they're good at

• Equal experience. Both kids see the same view, get the same sun, have the same recline. Less sibling fighting.
• Easier to push. Weight is balanced left to right, not front to back. The pivot is centered.
• Same length as a single. Fits standard sidewalks and elevators if the width works.
• Best for twins. Equal treatment matters more when both kids are the same age.

Where they fail

• Won't fit narrow doorways. Under 30 inches and you're stuck.
• Heavy. 30 to 35 lbs is typical.
• Doesn't fit through theme-park turnstiles.
• Sidewalk dominance. You take up most of the sidewalk; people will step into the street to pass.

Side-by-side picks

Joovy Scooter X2 ($370). Budget-friendly, 30 inches wide. Both seats hold up to 45 lbs. Heavy at 33 lbs and basic build, but the cheapest decent side-by-side.

Baby Jogger City Mini GT2 Double ($680). All-terrain wheels, one-hand fold (rare on a double), 30 inches wide. The mid-tier sweet spot.

Bumbleride Indie Twin ($900). 28.7 inches wide, fits standard doorways. Air-filled tires for rough terrain. A real all-terrain double. Premium pricing for a premium build.

UPPAbaby Vista V2 with two seats ($1,200). Converts from single to double. Modular system. The premium pick for parents who want flexibility.

Tandem (in-line) double strollers

What they're good at

• Same width as a single. Fits any doorway, any elevator, any narrow space.
• Better for sibling spacing of 1.5 to 4 years. The older child can ride in the back (sometimes called a RumbleSeat) and often wants to walk anyway.
• Easier to maneuver in tight spaces. The narrow profile turns sharply.
• Fits standard car trunks better than side-by-side.

Where they fail

• Longer length. Twice the length of a single, and harder in tight elevators.
• Unequal experience. The back kid stares at the back of the front seat. The rear seat usually has worse recline. Sibling rivalry, sponsored.
• Harder to push. Uneven weight makes turning awkward.
• Worse on stairs and curbs. The longer wheelbase doesn't pivot as cleanly.

Tandem picks

Baby Jogger City Tour 2 Double ($430). Lightweight tandem at 20 lbs with both seats reclining. Folds compact. Best for travel-heavy families.

Joovy Caboose Ultralight ($280). A "sit-and-stand": front seat for the younger kid, bench for the older one to sit or stand on. 25 lbs. Best when the older kid often walks anyway.

UPPAbaby Vista V2 with RumbleSeat ($1,200). Stadium-style seating, older in back, baby in front. Same modular system as the single Vista. The premium pick.

Mountain Buggy Duet ($900). Technically side-by-side, but at 28 inches wide it fits standard doorways while behaving like a tandem in tight spaces. The honest hybrid.

Which is right for you?

Choose side-by-side if

• You have twins.
• Your kids are under 2 years apart.
• Your doorways are 30+ inches wide.
• You walk a lot in open spaces (parks, suburbs).
• Equal treatment matters. (The older one will complain about being in the back.)

Choose tandem if

• Your kids are 1.5 to 4 years apart.
• Your doorways are under 30 inches.
• You live in a city with narrow elevators.
• The older child walks roughly half the time anyway.
• You park in tight spots or use a small car trunk.

Skip both if

• Your kids are 4+ years apart. The older one mostly walks; a single plus a board attachment is enough.
• You'll only need a double a handful of times. Borrow or rent (BabyQuip rents these by the week).
• You can fit a single plus a carrier. Wear baby, push toddler. Works for about a year.

The wear-and-walk alternative

If your kids are 18+ months apart, the cheapest "double stroller" is no second stroller at all. Keep your single, get a soft carrier (Solly Wrap for newborn, Ergobaby Omni 360 for older), and wear the baby while pushing the toddler.

Pros: no new stroller cost, baby loves being close, hands free. Cons: you carry the weight, and it's only practical until baby is around 25 lbs (9 to 12 months). After that, you'll want a real double.

The board-attachment alternative

For kids 3+ years apart, a stand-on board (BuggyBoard, Lascal Maxi) attaches to the back of any single stroller. Older kid stands on the board for tired moments and walks the rest of the time.

Pros: $80 to $150 vs $400 to $1,200 for a double. The footprint doesn't change. Easy to detach. Cons: only works for kids 2.5+ who can stand stably. Not for naps.

For kids 4+ years apart, this is usually the right call.