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Deal.ai › Troy-Bilt › Petrol Powered Mowers
Troy-Bilt
Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower

Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower

4.6(159 ratings)

Best price now

$389.99at Tractor Supply CoVerified

Compared across 2 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

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Our take on the Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower

The Troy-Bilt TB120B is a gas push mower with a 140cc Briggs & Stratton 550ex engine, a 21-inch steel deck, and three cutting modes: bag, mulch, or side discharge. ReadyStart means no priming or choking, and the six-position height lever spans 1.25 to 3.75 inches. It is a basic, dependable mower for small to mid-size lawns rather than a self-propelled or electric-start machine. At $389.99 at Tractor Supply Co as of November 8, 2026, it sits at the top of its recent range, so it is not a bargain price right now.

Best forSmall to mid-size flat lawnsBuyers who want a simple gas mower without batteriesHomeowners who bag, mulch, or side dischargeBudget-conscious first-time mower buyers
Pros
  • Briggs & Stratton 550ex engine is a common, serviceable design
  • ReadyStart: no priming or choke lever
  • 21-inch steel deck covers ground quickly and resists dents
  • Three discharge options: bag, mulch, side discharge
  • Six cutting heights from 1.25 to 3.75 inches
  • 1.9-bushel bag holds a good amount of clippings
Cons
  • Push only: no self-propel, tiring on slopes or large lawns
  • Recoil pull start, no electric start
  • 0.8-quart tank means frequent refueling on bigger yards
  • No oil included; you must add 15 oz of SAE 30 before first use
  • Heavier and louder than a cordless electric mower

Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower prices at every store

  • Tractor Supply CoNew

    Availability unknown

    $389.99Free shippingVerified
    Visit Tractor Supply Co
  • WalmartNew

    Out of stockSold by Supply the HomeReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $316.16Free shippingVerified
    Visit Walmart

Store links may earn us a commission. Some prices via Klarna.

Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower price history

Lowest price we've seen: $389.99 on Nov 8 at Tractor Supply Co. Tracked across 1 store since Nov 8.

What reviewers say

  • 4.6 / 5159 ratings

Rated 4.6 out of 5 from 159 ratings, owners mostly report easy starting and reliable cutting for the price. Complaints center on the push-only design and the small fuel tank.

What people mention
  • StartingPraisedOwners say ReadyStart fires on the first or second pull without priming.
  • Cut qualityPraisedReviewers report an even cut and good mulching on maintained lawns.
  • Push effortCriticisedOwners find pushing it tiring on slopes and large yards.
  • Fuel tankCriticisedThe 0.8-quart tank runs dry quickly on bigger properties.
  • BuildPraisedThe steel deck is described as solid and durable for the price.
  • NoiseMixedSome owners say it is louder than expected; others call it normal for a gas mower.

About the Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower

The Troy-Bilt TB120B walk behind lawn mower makes yard work easier with its reliable 140cc Briggs & Stratton engine, delivering consistent power for residential mowing tasks. This gas push mower features a 21 in. steel deck designed for durability and long-lasting performance, offering side discharge, mulching, and bagging capabilities to suit your lawn care needs. With ReadyStart technology, starting the mower is simple—no priming or choking required. The TB120B is a 4 cycle push mower, making it efficient and easy to maintain. Ideal for homeowners seeking a dependable mulcher push mower, this model is part of the trusted Troy-Bilt product line. The mower’s ergonomic design and push propulsion method provide comfortable handling, while the 21 in. cutting width covers more ground with each pass. Choose the Troy-Bilt TB120B for a versatile and powerful gas lawn mower 140cc that helps keep your yard looking its best season after season.

Specifications

Engine displacement
140ccSource
Engine brand
Briggs & Stratton®Source
Engine model
550exSource
Starter type
RecoilSource

Questions and answers

Is the TB120B self-propelled?
No. It is a push mower with no drive system, so you supply all the forward force. That is fine on flat, small lawns but tiring on slopes.
Does it come with oil?
No. It ships without engine oil, and the engine takes 15 oz. Add SAE 30 oil before the first start.
Can it mulch and bag?
Yes. It supports bagging with the 1.9-bushel bag, mulching, and side discharge. You switch between them at the rear discharge area.
How large a lawn can it handle?
The 21-inch deck and 0.8-quart tank suit small to mid-size yards, roughly a quarter acre or less. Bigger lawns mean frequent refueling and a lot of pushing.
Is $389.99 a good price?
It is the best new price found as of November 8, 2026, but it sits at the top of the mower's recent range. Waiting for a seasonal sale is reasonable.
Does it have electric start?
No. It uses a recoil pull starter. ReadyStart removes the priming and choking steps but not the pull.
Where is the Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower cheapest?
At Tractor Supply Co, for $389.99, as of our latest check.
What do buyers say about the Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower?
Rated 4.6 out of 5 from 159 ratings.
Where can I buy the Troy-Bilt 21 in 140cc Gas-Powered Push Lawn Mower?
2 stores we checked sell it, including Tractor Supply Co, Walmart.

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All Troy-Bilt deals and products →
Fuel tank capacity
0.8 qtSource
Engine oil capacity
15 ozSource
Drive system
FWDSource
Cutting width
21 inSource
Deck material
SteelSource
Cutting height range
1.25" - 3.75"Source
Deck positions
6Source
Grass bag capacity
1.9 BushelSource