Narrow profile spare tire, wheel, jack, and lug wrench for second generation (2106-2023) X1 models. Fits under rear cargo deck. Tire size is 135/80/R18 and is 26.5 inches in diameter. No need to buy expensive run-flat tires when you have a proper spare. The kit has never been used and is about one year old. We just bought a new X1, and the tire sizes are different. The kit is more than $400 new, plus tax and shipping. If you want a real spare, this is the best option.