The Havok Sport is a 27.5"+ wired tire. The Plussize offers perfect traction on the trail. Also with bad weather conditions and muddy uThe Havok Sport is a 27.5"+ wired tire. The Plussize offers perfect traction on the trail. Also with bad weather conditions and muddy underground the Havok Sport will give you much pleasure!nderground the Havok Sport will give you much pleasure!