Had a rear flat in 2017 after some early morning measuring. Had calibrated at 22,927 cts/ mile. Rushed home, pumped it up, tried it on street. It was a moderately fast leak. Went to cal course, repumped rear and rode. It was 2/3 flat when I finished but the recal of 22,899 was quite reasonable considering temps and a 120 lb pneumatic front.