Believe it or not, the steel ring that provides the support surface for a rotary kiln is called a tire (or tyre in the UK), and as best I can remember a Shoss is a section of a quasi-cylindrical assembly.

some refs:

Kiln Tyres are normally fabricated steel tyres which fit round the circumference of the main kiln body acting as very large diameter bearings which allow the kiln to rotate.
http://www.onsitemachining.com/description.html#anchorkilnty...

picture:
http://www.onsitemachining.com/pageimg/pickiln1large.html

{PDF] Phillips Rema Phillips Rema
... kritischen Punkten des Laufringschusses neben dem Laufring jeder Laufrollensta ... Nur ein mit höchster Präzision eingestellter Drehrohrofen gewährleistet einen ...
www.kiln.com/profile/downloads/BothGermanBrochures.pdf

(The above document is specifically about refinishing kiln tyres and has lots of good illustrations.)

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Note added at 4 hrs 39 mins (2005-03-01 20:49:45 GMT)
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that\'s \'Schuss\' (getting blinder all the time...)