A standardbred is the horse breed used in harness racing, for pacers and trotters alike. The Australian Harness Racing Rules (AHRR) define one as a horse by a registered standardbred sire out of a registered standardbred dam. The breed's Australian register is the Australian Trotting Stud Book, which records every standardbred active in breeding and racing.
For a punter, the breed explains much of what makes harness racing betting different: the gaits, the gallop as a fault, and how often the same horses race.
Standardbred vs thoroughbred
| Standardbred | Thoroughbred | |
|---|---|---|
| Racing gait | Trot or pace; a gallop is a fault | Gallop |
| How it is raced | Driven from a sulky (ridden in Monté races) | Ridden by a jockey |
| Australian register | Australian Trotting Stud Book | Australian Stud Book |
| Artificial breeding | Allowed, with licensed stations and technicians (AHRR Part 19) | Not allowed: only natural service qualifies a foal |
| Rule book | Australian Harness Racing Rules | Australian Rules of Racing |
The breeding rules show the split most clearly. The harness rules license artificial breeding and define semen to include frozen and chilled semen, while the Rules of the Australian Stud Book make a thoroughbred foal eligible only if it is the product of a natural service.
Pacing and trotting gaits
A standardbred races at one of two gaits. A pacer moves the front and hind legs on the same side together; a trotter moves diagonal pairs, left front with right hind. Standardbred Canada's glossary calls trotting the more natural gait for the breed, and pacers often race in hopples, straps that help hold the lateral gait.
Pacers dominate Australian harness racing. In Harness Racing Australia's (HRA's) results for TAB meetings from 1 July to 30 September 2026, 3,080 of the 3,509 races with a final result were for pacers: 3,080 / 3,509 = 87.8%. Trotters vs pacers sets out the betting differences between the two gaits.
How often standardbreds race
Standardbreds come back quickly. In those same results, 5,838 horses made 31,633 starts at TAB meetings over 92 days: 31,633 / 5,838 = 5.4 starts each, about one every 92 / 5.4 = 17 days, and 812 of them started 10 times or more.
The racing program makes that possible. HRA's results list 414 TAB meetings in the period, about 4.5 a day. The rules allow for quick back-ups too: Harness Racing Victoria's guidelines include a 2 day rule that lets a trainer withdraw, without a scratching fee, a nomination for a meeting in the two days after a horse races.
Over a year, as horses come and go, standardbreds race far more often than thoroughbreds. Harness Racing Australia counts 126,834 starts by 9,158 horses in 2025: 126,834 / 9,158 = 13.8 each. Racing Australia's Fact Book gives thoroughbreds 180,003 starters from 35,625 horses in 2024/25, counting a horse once in each state it raced in: 180,003 / 35,625 = 5.1 each.
What the breed means for betting
Frequent starts mean a standardbred's form is usually recent: a horse racing every two or three weeks has several runs in its last couple of months, so a change of driver, gear or class shows up quickly. It also means the market has plenty of recent evidence to price. The tracks vary too, and some have a sprint lane in the straight, so the same horse can look different from one track to the next.
B337 has no view on any horse; it compares prices. The Terminal shows prices from 40+ bookmakers across racing and sports, with harness racing as one of its three racing codes, exchange back and lay prices beside them and flucs showing how each price has moved. Bookmaker names are trade marks of their owners. B337 is not affiliated with them.
Risk: Betting involves risk. Recent form can mislead as easily as old form, and every harness runner carries the risk of a break. See responsible gambling for limits and support.