I was puttering in my shop this morning...I have 3 bikes with Cheng Shins on them. Two were OEM; a touring bike and an MTB. The MTB tires are over due for replacement and are dry rotted. The other set is on my beater Raleigh as replacement tires. FWIW the touring tires look brand new and have reflective sidewalls and that bike dates from around 1990 or so, hasn't seen too many miles
Aaron