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Service bulletin No. 28-21

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10198946
Published by NHTSA2021-07-06
Manufacturer's numberNo. 28-21
Manufacturer's date2021-06-16
NHTSA componentWHEELS

NHTSA's summary

List of approved wheel and tires for the 944.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Wheels

Vehicles listed
PORSCHE 9441987, 1988, 1989, 1990, 1991

Listing a model year does not mean every vehicle of it is concerned: the document says which.