MTB (look car) changed from 2.00 to 1.75. Although it is obvious, rolling resistance decreased, making it easy to keep running and keeping running. I thought that the balance will be worse as the diameter changes so I think that it became a reasonably quick steering. At the same time replaced with a tube of a rice valve and pneumatic control by GS, noticing that the surprisingly rigid state is standard → became to roll further. I think that it is 100 km or less in a year's running, but there are still hair.