>>978516This is all technical but
A low TPI consists of a woven carcass in which the individual threads are thicker both in length and with,thus needing less threads to fill,in this case one inch of width
They typically are less supple,but because of the coarser nature of the treads they are harder to cut by foreign objects but can lead to a sliiiiiightly higher weight and higher rolling resistance do to having less ability to deform to the roads contours
A higher TPI basically is the opposite side of the low TPI count typically found of lower-end tires.
Many other factors do come in play so dont let a (slightly) lower TPI put you off.
Its certainly not the only measurement of quality in a tire.