this listing is for two (2) 14 x 3 solid drive tires for shoprider merits invacare quickie power chair. 1 5/8″ wide at bead. Your wheelchair or scooter should have a two piece wheel (also called a split rim, imagine halving a yo yo). Since a foam filled tire is basically a pneumatic tire filled with foam during the manufacturing process, tire sizing is the same. However the bead width of the split rim can vary. The bead width is the distance between the inside of the rims lip, where the edge of the tire seats. This is because there was never standard (split rim) bead width sizing adopted in the wheelchair/scooter industry. As a result you can have several tires of the same size with different bead widths and only one of them will properly fit your split rim. If the bead width of the tire you purchase is too narrow for your split rim, there will not be enough compression between the two halves of your split rim against the tire causing the tire to rotate separately. If the bead width is too wide, you will never get the two halves of the split rim and the tire screwed back together. Taking the time to measure bead width will ensure you purchase the right foam filled tire and save you from an installation headache and the hassle of sending them back. Returned tires will be subject to a 20% restocking fee. We as well, sell a compression tool that makes the job much easier, found here: http://www.amazon.com/dp/B00OXNF3JI You can see how it works here, https://www.youtube.com/watch?v=sXLt-y32aFA