The Drunken Rhinoceros 128 is the world's widest carbon fat bike rim. It was designed and developed in late 2022, and released in April 2023.

We once thought the Xiphias 105mm rim was wide enough for the biggest tires on the market. But one of our loyal fat bike customers told us the Xiphias 105mm was still not wide enough — especially for very thick snow, where wider rims make a real difference. So we decided to push the boundaries of carbon fiber cycling and build the world's widest carbon bicycle rim: the Drunken Rhinoceros 128mm. Even though it is an extremely niche product, we wanted to meet the needs of riders from all over the world.

The Drunken Rhinoceros 128 uses the classic triangular design structure of the Wild Dragon, giving it extremely high strength and making it more suitable for wider tires. Recommended tire size is 5.2" to 6.5", with 3 to 10 psi tire pressure.

The Drunken Rhinoceros 128 is ideal for:

Riders who ride in the deepest snow, soft sand, or extreme terrain.

Riders running 5.2" to 6.5" tires who need maximum flotation.

Anyone who wants the widest carbon fat bike rim available today.

Builders pairing it with 150mm or 197mm rear hub spacing on modern fat bike frames.

A 128mm external width fits jumbo snow tires for extreme conditions while keeping rotating mass low.

The 45mm deep section adds rigidity for aggressive riders and heavy loads.

A deep channel between the bead seats makes tire installation and removal easier.

A compact bead socket locks tires in tightly for reliable tubeless setup.

The aero-style triangular profile sheds dirt, mud and snow as conditions get rough.

Carbon Rim(s)