Troy-Bilt Bronco™ 42 Riding Lawn Mower
Riding (Lawn Tractor) mower · Model 13A878BSA23 · Residential-duty · Gas
$2,199 Troy-Bilt list price
Manufacturer list price only — it excludes tax, freight, dealer setup and any local discount, and dealers set the final price.
- Mows an acre in 46 min (32 at top speed) How long for your yard? ›
- How these are worked out ›
The Troy-Bilt Bronco 42 Riding Lawn Mower is a residential-grade gas lawn tractor, built for larger home yards, with a 42-inch deck and a 547cc engine.
Also sold as: Bronco 42 Riding Lawn Mower (Standard)
At a glance
Compare similar mowers See how this mower compares with machines of a similar size and purpose.
Chosen by stated rules, not opinion: same class, a deck within 6 in of this one, the same kind of power and a compatible duty class, then the closest power, weight and price, with other makers preferred. Figures are the manufacturers’ published ones; nothing is estimated.
Engine
| Power Source | gas |
|---|---|
| Displacement | 33.4 ci (547 cc) |
| Engine Make | Troy-Bilt® |
| Cylinders | 1 |
| Start Type | Electric |
Electrical
| Voltage | 12 V |
|---|
Deck
| Cutting Width | 42 in (1067 mm) |
|---|---|
| Blades | 2 |
| Min Cut Height | 1.5 in (38 mm) |
| Max Cut Height | 3.7 in (95 mm) |
| Deck Material | 13-gauge steel |
| Deck Construction | Stamped |
| Deck Gauge | 13 |
| Cut Positions | 5 |
Drive
| Transmission | Troy-Bilt |
|---|---|
| Ground Speed | 5.5 mph |
| Drive Tire Size | 20"x 8"-8" |
| Drive System | CVT |
| Reverse Speed | 2.5 mph |
Dimensions
| Fuel Capacity | 1.4 gal (5.2 L) |
|---|
Commercial / Pro
| Frame Construction | Robotically welded |
|---|---|
| Seat Type | Mid-back |
| Commercial Warranty | No |
General
| Warranty | 3 yr |
|---|
Productivity & acreage
Bronco 42 Riding Lawn Mower deck width, ground speed and computed acres-per-hour, from the specs we have. Duty class: Residential — Built for home-lawn use.
Productivity computed from deck width and ground speed. Compare on the calculator ›
| Deck width | 42 in |
|---|---|
| Engine make | Troy-Bilt® |
| Engine displacement | 547 cc |
| Transmission | Troy-Bilt |
| Ground speed | 5.5 mph |
| Cut-height range | 38 mm – 95 mm |
| Fuel capacity | 5.2 L |
| Warranty | 3 |
| Commercial warranty | No |
| Deck construction | Stamped |
| Deck gauge | 13 ga |
| Frame construction | Robotically welded |
| Drive tire size | 20"x 8"-8" |
| Seat type | Mid-back |
Troy-Bilt doesn’t publish 5 of these for the Bronco 42 Riding Lawn Mower: engine power, drive type, weight, spindle type, anti-scalp rollers.
Similar models
Other riding (lawn tractor) mowers with comparable specs — including other brands — that buyers cross-shop with the Bronco 42 Riding Lawn Mower.
Specs verified against the manufacturer spec sheet on Jun 6, 2026 — troybilt.com.
See every mower with a Troy-Bilt engine ›
What the parts on this spec sheet mean
Other Troy-Bilt Bronco models › 1 more in this range: Bronco 46 Riding Lawn Mower
See all Troy-Bilt mowers and specs ›
Spot a wrong spec? Suggest a correction.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.
What the specs work out to
Figures MowerFacts computes from Troy-Bilt’s own numbers — not published by the manufacturer.
Mowing time
- ¼ acre11 min 8 min
- ½ acre23 min 16 min
- 1 acre46 min 32 min
- 2 acres1 h 32 min 1 h 4 min
- 5 acres3 h 50 min 2 h 41 min
About 46 min per acre at 1.31 acres/hour, mowing at 3.8 mph. The second figure is at the published 5.5 mph top speed (1.87 acres/hour) — faster than anyone really mows. About 1.8 acres per tank.
Gate & trailer fit
- 32 in gateToo wide
- 36 in gateToo wide
- 48 in gateToo wide
Needs at least 49 in of clearance (estimated).
Power & run time
- Run time per tank~1.4 h
Mowing times assume 1.31 acres/hour: deck width x 3.8 mph at 80% efficiency, which allows for overlap, turns and trimming. 3.8 mph is 70% of the 5.5 mph top speed Troy-Bilt publishes - almost nobody mows flat out. The "at top speed" figure is the same sum at 5.5 mph, shown so you can see it.
Fit uses the deck width plus 6 in for the discharge chute, because Troy-Bilt doesn't publish an overall width — measure before buying if a gate is tight.
Run time assumes a typical 1 gal/hour burn at working load; real consumption varies with engine, load and cut.
Troy-Bilt Bronco 42 Riding Lawn Mower questions
What size deck is on the Troy-Bilt Bronco 42 Riding Lawn Mower?
The Troy-Bilt Bronco 42 Riding Lawn Mower has a 42-inch (1067 mm) cutting deck with 2 blades and 13-gauge steel construction.
What engine is in the Troy-Bilt Bronco 42 Riding Lawn Mower?
The Troy-Bilt Bronco 42 Riding Lawn Mower is powered by a Troy-Bilt®, 547 cc. Horsepower is the manufacturer's own rating.
How fast is the Troy-Bilt Bronco 42 Riding Lawn Mower?
Top ground speed is 5.5 mph. With its 42-inch deck that works out to about 1.87 acres per hour at 80% efficiency — allowing for overlap, turns and trimming.
How long does the Troy-Bilt Bronco 42 Riding Lawn Mower take to mow an acre?
About 32 min per acre, from its 42-inch deck at 5.5 mph and 80% efficiency — roughly 1.87 acres an hour, so five acres is about 2 h 40 min. Rough or obstacle-heavy ground takes longer; this is deck width times ground speed, not a timed test.
How big is the fuel tank on the Troy-Bilt Bronco 42 Riding Lawn Mower?
The Troy-Bilt Bronco 42 Riding Lawn Mower holds 1.4 gal (5.2 L) of fuel.
How much does the Troy-Bilt Bronco 42 Riding Lawn Mower cost?
Troy-Bilt's published list price is $2,199, checked 23 October 2026. That excludes tax, freight, dealer setup and any local discount — dealers set the final price.
What is the Troy-Bilt Bronco 42 Riding Lawn Mower built for?
Residential-duty riding mower. Built for home-lawn use.
Source: Troy-Bilt (manufacturer) · archived copy