Bit Sizing Guide
Measure the horse in front of you: mouth anatomy varies, so breed and body size cannot determine bit width. This guide covers the measurements and checks that help you compare the current Sprenger and Nathe options at Kingdom Equestrian.
Measure width
Use Sprenger’s printable bit measure and its instructions. Sprenger also describes measuring the mouth and adding 0.5–1 cm as a starting point. Use the tool’s instructions and check the exact bit style.
The widths currently shown across KE’s Sprenger bit listings are 95, 105, 110, 115, 120, 125, 130, 132, 135, 140, 145, 150, 155 and 160 mm, plus some one-size models. See the millimetre-to-inch conversion table. The manufacturer may offer more sizes than KE currently stocks.
Check how the bit sits
For a correctly fitted loose-ring bit, Sprenger’s general guidance is about 3–5 mm between the ring hole and each mouth corner, with the rings able to move freely. Fixed side pieces such as eggbutt, D-ring and full-cheek designs should sit close to the mouth corners without pinching. The width can vary by model and side style.
Thickness and mouthpiece shape
Width and thickness are separate measurements. The space available depends on the individual mouth. Sprenger describes a two-finger check for estimating space, but this should be carried out by someone who can do it safely. Ask an equine dental professional or experienced bit fitter about the thickness and design for a particular horse.
Single-jointed, double-jointed and mullen-mouth pieces distribute contact differently. A mouthpiece or cheek style cannot be selected reliably from one behaviour or a generic “soft” or “strong” label.
Get help with an individual fit
If you see rubbing, redness, sores, a damaged bit or a sudden change in your horse’s response, stop and seek an appropriate professional assessment. Symptoms can have dental, health, training, bridle or fit causes.
Explore all Sprenger help and buying guides · Read the Sprenger fitting guide · Read the Sprenger FAQs · Shop Sprenger
Sources: Sprenger bit size, Sprenger bit fit and its equestrian FAQ.
