The Grange Tyre Reef is one of the older artificial reefs off Adelaide, laid by the state Fisheries Department in the late 1970s (Wikivoyage says early 1980s) about 4 km off West Beach and Grange. The Sea Wolves describe old tyre squares spread over a large area of sand, while Wikivoyage refers to tetrahedron modules of used car tyres ballasted with concrete. The tyres sit in about 15 m of water, with the deepest sand around 18 m.

Like its counterparts off Glenelg and Noarlunga, the reef was intended to create fish habitat on a featureless seabed, and it supports a wide variety of life according to local sources. The modules are coated in sponges and small invertebrates, and fish such as old wives, bullseyes, leatherjackets, magpie perch and whiting gather around them. The Federation notes that weedy seadragons are occasionally seen, an unusual bonus for an offshore artificial reef.

Because it is quite spread out and the modules look similar, navigation takes some care, and visibility can be variable. No specific hazards are noted beyond those of any offshore boat site, but loose straps and tyres can snag gear. The Grange Tyre Reef is a quieter alternative to the Glenelg wrecks for divers launching at West Beach, and a good site for those interested in the history of South Australia's artificial reef program.

It suits Open Water divers with offshore experience and anyone keen to search for weedy seadragons away from the crowds. Bring a compass and a surface marker, and plan a conservative turn point, as the anchor can be surprisingly hard to find again among identical modules in poor visibility.

Boat access only. Launch at West Beach boat ramp (about 15 minutes' run north-west) or North Haven (about 20 minutes south). The reef is about 4 km offshore from the Grange/West Beach coast and cannot be seen from the surface, so use a GPS mark.

Anchor in sand beside the modules – there is no mooring – and keep a boat attendant with a dive flag.

An offshore gulf site best dived in offshore easterly winds, early in the day before the summer south-westerly sea breeze. Westerly and south-westerly winds build chop and stir the silty bottom. Tidal movement is usually mild; neap dodge tides are easiest.

Visibility is reduced after rain by outflow from the Torrens and stormwater outlets along the Henley-Grange coast.

Anchor at the edge of the tyre field and swim a compass-guided loop among the squares at 15 m, turning at half gas. Look for weedy seadragons in any weed growth between modules.

No regular charter; occasional club dives and private boats from West Beach or North Haven.