blog Are you suitably mounted? How to check your horse-to-rider weight ratio

Just like people, horses come in all shapes and sizes. Their ability to carry weight depends on several factors, including age, fitness and conformation. To ensure consistency and protect welfare in competitions and other RoR participation events, RoR uses a straightforward guideline based on the horse-to-rider weight ratio.

Understanding RoR’s weight ratio guidelines

For RoR competitions and other ridden events (including clinics and camps), the guideline is that the rider, along with all their tack (including saddle, stirrups, girths, numnahs and saddle pads/cloths, riding hat and boots), should not exceed 17% of the horse’s bodyweight. The absolute upper limit is 20%.

This means that for a 500kg Thoroughbred, the recommended maximum combined rider and tack weight is 85kg, while the maximum allowable limit is 100kg.

Remaining within the 17% guideline is strongly encouraged for the horse’s welfare and long-term soundness. However, the 20% limit must not be exceeded under any circumstances. Where there is a clear mismatch between horse and rider, RoR officials may intervene, but any concerns will always be handled discreetly and privately.

Other important factors should also be considered, including the rider’s balance and skill, the nature of the exercise, the horse’s build and condition, and the suitability of the tack.

Why rider weight matters

We know that asking a horse to carry too much weight can cause muscle fatigue and loss of muscle tone, affecting their posture, movement and skeletal structure. This may lead to stumbling, lameness, or behavioural issues such as reluctance to be tacked up or mounted. These issues can compromise both performance and safety for horse and rider.

As riders, it’s important to be honest about our own weight and take responsibility for the effect it can have. As society has changed over the past 50 years, average body weights have increased — and while this is not unique to equestrian sport, it does have particular implications for horse welfare.

A compassionate and welfare-first approach

We recognise that this is a sensitive subject. Weight can be a difficult or even triggering topic for many people. But as a charity focused on the welfare of ex-racehorses, it’s essential that we talk about this openly, fairly and with compassion.

Our goal is never to judge. Instead, it’s about giving horses the best possible chance at a healthy, happy life after racing.

Small steps that make a big difference

To support good welfare and help riders stay within recommended limits, we encourage the following:

• Weigh yourself with all your tack and in full riding gear every six months.
• Have your horse weighed and condition scored at least twice a year.

Think of it like any other element of routine horse care, like having your saddle checked every four to six months or staying up to date with vaccinations and dental work.

Welfare stewards at the RoR Winter and National Championships 

Welfare stewards will be present throughout the RoR Winter Championships in April and RoR National Championships in August. They are here to help and support, whether you’d like to use the weighbridge, ask about your horse’s condition score, or simply want some guidance.

As part of our commitment to welfare, stewards will be awarding suitably mounted certificates. These will be given to riders who meet the 20% limit, based on weight readings taken at the event. 

Please note that any combination can present themselves for weighing and horse condition scoring, but this is completely optional. 

Read more about the Welfare Stewarding Group

Suitably mounted rules now compulsory

To support the long-term health and wellbeing of former racehorses, from 2026, our suitably mounted horse-to-rider weight ratios are now compulsory across all RoR competitions and ridden events, including competitions, clinics, camps and parades.

Key points:

• Rider and tack weight should ideally not exceed 17% of the horse’s body weight. 
• The absolute maximum permitted is 20%.
• Judges may eliminate a combination if they believe the horse’s welfare is compromised.
• These measures are designed to help protect horses from injury and discomfort, supporting their long-term soundness.

A growing focus across the equestrian world

A growing number of equestrian organisations are introducing rider weight guidelines, and there is ongoing research to strengthen the evidence base. It is hoped that this approach will become standard across all disciplines.

These guidelines are not a barrier to riding, they are a tool to protect horse welfare. Choosing a suitable mount and being honest about our own suitability is part of responsible horse ownership and horsemanship.

If you have any concerns or questions about your horse/rider weight ratio, we’re here to help. Contact the RoR team on [email protected] or 01488 648998.