Chevrolet Silverado 2004–2005 — technical service bulletin
Bulletin 3235 · NHTSA communication 10010654 · issued Dec 4, 2004
Technical service bulletin
communication type
Tires
component
2004–2005
model years
4
vehicle entries
Official summary
20 inch wheels stop sell on 1500 crew cab with 5'8' bed. *eh
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.