Most cat wheel regrets come down to one thing: size. A wheel that is too small forces your cat to run with a curved back and short, choppy strides. They try it a few times, decide it feels awkward, and it becomes the most expensive cat bed in the house.
Getting the size right is simple once you know what to measure. This guide walks through how to match a wheel to your cat's body, breed and household, and how the Ferris Cat Wheel and the larger Grand Ferris Cat Wheel compare.
Key Takeaways
- Internal diameter is the number that matters most. It decides how flat your cat's back stays while running.
- The Ferris Cat Wheel has a 121 cm internal diameter and suits most domestic cats.
- The Grand Ferris has a 152 cm internal diameter and a 16 kg weight capacity, built for large breeds, long-bodied cats and cats that run together.
- As a rule of thumb, most cats under about 6 kg suit the Ferris. Large breeds and cats over 6 kg are usually better on the Grand Ferris.
- Check your floor space and your floor surface before you buy, not after.
Why Wheel Size Matters So Much
When a cat runs on flat ground, their spine flexes and extends through each stride. On a wheel, the running surface curves up in front of them. The smaller the wheel, the tighter that curve, and the more your cat has to arch their back to fit inside it.
A cat running inside a wheel that is too tight will usually show it. They take shorter steps, stay near the bottom of the wheel, hop rather than run, or step off after a few seconds. None of that means your cat does not like running. It means the wheel does not fit them.
A larger diameter gives a flatter running surface, a longer stride and a more natural gait. That is also what makes a wheel feel safe enough for a cat to commit to a full sprint.
How to Tell If Your Cat Needs a Larger Wheel
You do not need exact measurements to make a good call. Work through these questions:
- How long is your cat? Measure from nose to the base of the tail while they are stretched out. Long-bodied cats need a larger diameter even if they are not especially heavy.
- How much do they weigh? Heavier cats need a wheel with the capacity and base to handle the force of a full run.
- What breed are they? Large and long breeds almost always do better on a bigger wheel.
- Are they still growing? Kittens from large breeds can double in size. Buy for the adult cat, not the kitten.
- Will more than one cat use it at the same time? Two cats running together need more room and more weight capacity than one.
Ferris vs Grand Ferris: Side by Side
| Ferris Cat Wheel | Grand Ferris Cat Wheel | |
|---|---|---|
| Internal diameter | 121 cm | 152 cm |
| Outer diameter | 130 cm | 160 cm |
| Height | 141 cm | 162 cm |
| Depth | 31 cm | 38 cm |
| Weight capacity | Up to 11.3 kg | Up to 16 kg |
| Best for | Most domestic cats, active breeds like Bengals, Siamese and Oriental Shorthairs | Large and long breeds, heavier cats, two cats running together |
The Grand Ferris also sits lower to the ground, so the step in is easier for kittens, senior cats and cats that are new to wheels. The difference in diameter is 31 cm. That sounds modest, but it changes the curve of the running surface noticeably, and it is the reason larger cats that ignore a standard wheel will often run confidently on the Grand Ferris. For a closer look at the bigger model, read our Grand Ferris Cat Wheel guide.
Which Size Suits Which Breed?
Every cat is an individual, so treat this as a starting point rather than a rule.
The Ferris Cat Wheel usually suits:
- Bengals (particularly females and smaller males)
- Abyssinians and Somalis
- Siamese, Oriental Shorthairs and Burmese
- Devon and Cornish Rex
- Sphynx
- Most domestic shorthairs and moggies
The Grand Ferris usually suits:
- Maine Coons
- Ragdolls
- Norwegian Forest Cats and Siberians
- Savannahs
- Large male Bengals
- Any cat that is long in the body, whatever the breed
A simple rule of thumb: if your cat is a standard domestic breed and under about 6 kg, the Ferris will suit them well. If they are a larger breed, over 6 kg, or long in the body, choose the Grand Ferris. If your cat sits on the line between the two, go bigger. A cat will happily run in a wheel with room to spare. They will not run in one that feels cramped.
Multi-Cat Households
Plenty of cats share a wheel, and some will run in it at the same time. When they do, the weight capacity applies to their combined weight, and they need enough diameter to move without tripping over each other.
If you have two cats that like to chase each other, the Grand Ferris is the safer choice. Its 16 kg capacity and wider running surface give two average-sized cats room to run together. If your cats take turns, which is more common, size the wheel for your largest cat.
Do You Have Room for It?
Measure your space before you order. As a guide, allow for the wheel's outer diameter in width and a little clearance on each side so your cat can get on and off easily.
- Ferris: about 130 cm wide, 31 cm deep and 141 cm tall.
- Grand Ferris: about 160 cm wide, 38 cm deep and 162 cm tall, and 33 kg once assembled.
Pick the spot before you assemble it. Both wheels are designed to stay put once built, and the Grand Ferris in particular is not something you will want to move from room to room. Choose somewhere your cat already spends time, away from walls, on the flattest part of the floor.
Don't Forget the Floor
A bigger wheel means more mass in motion, and more force going into the floor with every stride. On timber, tile, vinyl or polished concrete, that can make a wheel creep, rock or rumble, which is enough to make a cautious cat hesitate.
The Anti-Slip Safety Wheel Mat is sized at 150 × 60 cm to sit under both the Ferris and the Grand Ferris. It holds the wheel in place, levels minor dips in the floor and cuts noise. We cover the details in how to stop your cat wheel slipping.
Frequently Asked Questions
What size cat wheel does a Maine Coon need?
A Maine Coon needs a large wheel. The Grand Ferris, with a 152 cm internal diameter and 16 kg capacity, gives adult Maine Coons room to run with a flat back and full stride.
Is a cat wheel safe for large cats?
Yes, as long as the wheel is sized for them. The main risks with large cats come from wheels that are too small or too light. Choose a wheel with enough diameter and weight capacity, and set it up on a stable, non-slip base.
Should I buy a bigger wheel for a kitten?
Buy for your cat's adult size. Kittens can use a large wheel from a young age, and you will not need to replace it as they grow. Always supervise young kittens on the wheel until they are confident.
Can two cats use a cat wheel at the same time?
They can, provided their combined weight stays within the wheel's capacity and the wheel is large enough for both. The Grand Ferris is the better fit for cats that run together.
What if my cat is between sizes?
Go bigger. Cats are comfortable in a wheel with spare room, but they tend to avoid one that feels tight.
Which Size Should You Choose?
For most cats, the Ferris Cat Wheel is the right size. For large breeds, long-bodied cats, heavier cats and households where two cats run together, the Grand Ferris is worth the extra space. If you are unsure, size up. And if you are still wondering whether your cat will take to a wheel at all, read will your cat actually use a cat wheel?