THE benefit of the 10 per cent cut in basic excise duty on tyres and tubes is likely to be absorbed by the manufactufers themselves, ;This is indicated by the increase of 9 to 10 per cent in ex-factory prices of truck and bus tyres and tubes announced by two manufac-turers, Dunlop and Goodyear. Accord-ing to market sources, it is only a mat-ter of time before other manufacturers follow suit. Tyre and tube manufac-turers, it would seem, deliberately stagger price increases, perhaps to escape the attention of the MRTP authorities.