Good MTB wheels are important for a comfortable and safe ride on your mountain bike. Depending on your discipline you need different types of mountain bike wheels. Light mountain bike wheels are ideal for cross country or marathon. Are you an Enduro rider or downhiller? In that case, weight is less important, but you certainly want the strongest mountain bike wheels.Besides different types of MTB wheels for the different MTB disciplines, you can also chooses between different wheel sizes, namely 26, 27.5 and 29 inch MTB wheels. Generally, 26 inch mountain bike wheels become less and less common. 29 inch MTB wheels have become the standard for many mountain bikes. In recent years, 27.5 inch mountain bike wheels become more common too.