Wethepeople's flagship front tyre, the Grippin.

Semi-tread design,
120 TPI* 
durable grip compound with traction improvers
20” x 2.1”: 630g (1.39lbs),
20” x 2.25”: 638g (1.41lbs)

* more threads per inch than regular tires. 
results in lightweight structure with same sidewall strength.