If you've been told to put on a martingale stop and aren't sure where to start, this guide walks you through both pieces riders mean by that term. First, you'll learn how to install rein stops—the small rubber or leather pieces that prevent a running martingale's rings from sliding up toward the bit. Second, you'll see how to position the neck-strap stop, a rubber keeper that centers the chest piece on the neck strap of running or standing martingales.
What a "Martingale Stop" Is
Riders use "martingale stop" to incorrectly describe two different pieces of tack, and beginners often mix them up. Rein stops are small rubber or leather stoppers that slide onto your reins; they're used exclusively with a running martingale to prevent the metal rings from traveling too far up the rein toward the bit or rein buckle. The martingale stop is the neck-strap stop; a rubber block that snugly wraps around both the neck strap and the martingale strap that goes to the girth of a running or standing martingale. It keeps the strap that goes to the girth safely secured at the front of the chest, so it doesn't slide down and hang between the front legs and could cause problems. Most riders searching "how to put on a martingale stop" need rein stops, but both parts matter for safe, correct fit. This guide covers how to install and position each one.
Where Rein Stops Go
Rein stops exist to prevent a running martingale ring from sliding too far up the rein toward the bit and rein buckle, to prevent the running martingale rings from getting caught on the rein buckle or the bit. In normal head carriage with light contact, the running martingale rings should sit well below the stop, free to move. When you are riding and the horse moves his head around, especially downward, the rings can slide until they meet the stops, but they must not travel past it. A practical starting point is 4–6 inches (10–15 centimeters) from the bit ring on most snaffle reins. Once the horse is tacked and standing square, you can fine-tune the distance. Adjust as needed to suit your horse's conformation and rein length.
Step-by-Step: How to Put On Rein Stops
Follow these numbered steps to install rein stops correctly.
- Remove or unbuckle your reins from the bit. This gives you open ends to work with; if your reins are stitched together at the end, you can work from the bit end, but it's a bit more difficult to get the rubber rein stops over the buckles.
- Soften each rubber stop in warm water for 1–2 minutes. This is optional but makes the rubber more pliable and easier to stretch over the rein leather.
- Make a pull-through loop. Thread a piece of string or a boot lace through the slit in the stop. Loop the string around the rein at the point where you want the stop to sit, then ease the stop onto the rein. The string acts as a lever and helps to get the stop over the bumps of a laced rein or rubber rein.
- Slide the stop into position. Use the 4–6 inch guideline from the bit ring; you can adjust later if needed.
- Repeat for the other rein. Measure the distance from the bit ring on the second rein so both stops sit at matching positions—uneven stops can create uneven rein pressure.
- Reattach the reins to the bit. Check that the stops lie flat on the reins, not twisted.
Final check: With the running martingale attached, pick up the reins to a normal riding contact. The rings should sit about in the middle of your reins' length, with the running martingale rings resting about halfway between your hands to the bit. The rubber rein stops should sit between the martingale rings and the bit.
How to Put On a Running or Standing Martingale Stop
To put the martingale stop on a running or standing martingale is a little tricky. The martingale stop secures in place the neck-strap and the strap that goes down to the girth. The martingale stop should sit in the center in front of the horse's chest. Unbuckle the neck strap. Slide the martingale stop—a rubber oval-shaped donut—onto the neck strap. The martingale stop is designed to go at the junction of the neck strap and the long strap that goes to the girth. The martingale stop secures the long strap that goes to the girth at this junction so it doesn't hang down between the horse's front legs. You need to feed the other strap into the rubber donut martingale stop as well. Have a pair of needle nose pliers or a hoof pick on hand to help open the rubber stop so you can slide the leather pieces in place. It will take several tries. When in place properly, the martingale stop will be diagonally across the two leather pieces.
Fit Checks After Installing Stops
Once the bridle and martingale are on the horse, confirm that every part functions correctly without restricting movement. Rein stops: The running martingale rings must not reach the bit or rein buckle when you lift the reins to normal contact; they should meet the stops first. If a ring touches the bit, slide the stop down the rein.
Running martingale length: Pick up your reins to a normal riding position, the rings should not pull the reins that fix the horse's head carriage. If they do, lengthen the chest strap one hole at a time and re-check.
Standing martingale: The rule of thumb for adjusting the standing martingale is as follows: attach the martingale to the noseband. With the horse's head in a natural position, you should be able to lift the martingale strap up to the throat latch. The standing martingale will hang down in a gentle curve when not in use. The horse's head will be restricted when the horse puts his head up too high, but it should not be so tight that it pulls the head down. Trainer's preference varies on this fit, so stay conservative and ask for guidance if you're unsure.
Rein stops and martingale fit should never restrict your horse's ability to carry his head comfortably or to stretch forward and down. If you're unsure about placement or adjustment, set the stops conservatively—farther from the bit than you think you need—and ask a trainer to check your fit before you ride. A martingale that's too tight can cause resistance, head-tossing, or even injury.
Common Mistakes When Putting on Stops (and Quick Fixes)
Avoid these errors that can make rein stops ineffective or even unsafe:
- Stops too close to the bit: The ring hits the bit before the stop can block it. Slide both stops down the rein 1–2 inches and re-check.
- Stops too far away: The ring never reaches the stop, so the stop does nothing. Slide both stops up the rein closer to the bit.
- Only one stop installed: Always install two rein stops at matching distances. Uneven placement creates uneven contact.
- Twisted stop: The slit doesn't align with the rein, or the stop sits crooked. Remove it, soften it again if needed, and re-pull it onto the rein so the slit runs parallel to the rein leather.
- No martingale neck-strap stop: Add a neck-strap stop and center it at the junction of the neck strap and the long strap that goes to the girth is fixed in place.
- Using a running martingale with curb reins: The running martingale should only be used with a snaffle bit, or when using a pelham bit, place it on the wider snaffle reins. It is better to use a standing martingale on the noseband when using a pelham bit.
Care & Replacement of Rein Stops and Martingale Stops
Check rein stops and the martingale stops weekly for cracks, hardening, or tears; replace them at the first sign of failure. Rubber that's stiff or cracked can snap under pressure or let a ring slip through. Wipe sweat and arena grit from your reins and all rubber parts after each ride; avoid petroleum-based leather conditioners or cleaners that can degrade rubber over time. In cold weather, warm the stops in your hands or in warm water before making adjustments—pulling on cold rubber can crack it.
How to Troubleshoot Stops
| Problem | Likely Cause | Quick Fix |
|---|---|---|
| Ring reaches the bit | Rein stops too close to the bit | Slide both stops down the rein 1–2 inches |
| Ring never touches the stop | Stops positioned too far down | Slide both stops up closer to the bit |
| Martingale drifts sideways | No neck-strap stop, or not centered | Add or re-center the neck-strap stop |
| Rein stop twisted or crooked on rein | Installed with slit not aligned | Move into place with slit parallel |
Martingale Stop FAQs
Do I need rein stops with a running martingale?
Always! Rein stops prevent the martingale's metal rings from sliding up the rein to the bit or rein buckle, where they can pinch the horse's mouth, catch on the bit ring, or restrict head movement. Without rein stops, a running martingale is unsafe to use.
How far from the bit should rein stops be?
Start at 4–6 inches from the bit ring on most snaffle reins, then adjust based on your horse's head carriage and rein length. With the reins lifted to normal contact, the martingale rings should meet the stops before they reach the bit. If the rings touch the bit, slide the stops down; if the rings never reach the stops, slide them up.
Which side of the rein do stops face?
The slit in the stop should align with the length of the rein so the stop lies flat, not twisted. When you pull the stop onto the rein, keep the slit parallel to the rein leather; if it's crooked, adjust as necessary.
Can I install stops without removing reins?
Yes, by using a pull-through string or loop, but it's slower on laced or stitched reins with no open ends. Unbuckling the reins from the bit gives you an open end and makes installation much faster and easier.
What's the difference between rein stops and a martingale stop?
Rein stops go on the reins and are used with a running martingale to block the rings from sliding toward the bit. A martingale stop goes on the neck strap and keeps the strap that goes to the girth centered on running or standing martingales, and also prevents the girth strap from hanging down between the front legs. They serve different purposes and are not interchangeable.
Do standing martingales use rein stops?
No. Standing martingales attach directly to the noseband and don't use reins or rings, so rein stops aren't needed. Standing martingales do use a martingale stop to keep the martingale centered on the neck strap and prevent the girth strap from sliding down between the front legs.
How often should I replace stops?
Replace rein stops and neck-strap stops at the first signs of cracking, hardening, or tearing. Check them weekly; rubber that's stiff or damaged can fail under pressure, letting a ring slip through or causing the martingale to drift.
Ready to Ride Safely?
Add a pair of quality rein stops and a martingale stop to your tack kit so you're always prepared for correct martingale fit. Grewal Equestrian's Rubber Martingale Stoppers come in a convenient 2-pack and are made from durable rubber that stands up to daily use. The first time you install and adjust them, ask a trainer or experienced rider to check your work—getting it right from the start builds good habits and keeps your horse comfortable.
