If you want to ride in the open air during cold winter, or to ride for fun on the beach, fat bikes (also called snow bikes, beach bikes) will be your good partner. 

ProX carbon fatbike rims are designed with double wall structure which is much stronger and stiffer than those single wall structure.

To meet diverse demand of riders, ProX provides fat bike carbon rims 65/85/90mm width option for 26er fat bikes (or snow bikes) and 75mm width for 27.5er fat bikes (or snow bikes). 

Generally, 65-75mm width fat bike carbon rims are more suitable for riders who prefer a relatively lighter fatbike wheelset and typically use 3.8’’-4.0’’ fat tires.

85-90mm width carbon fat bike rims are more suitable for riders who prefer to use big fat tires around 4.5-4.9’’ which is heavier but stabler in wet and slippery road condition.