EFFECT OF TREAD PATTERN DEPTH AND TYRE GROOVING ON LORRY TYRE SKIDDING RESISTANCE

Two investigations have been carried out into the wet road grip of lorry tyres. The first studied the effect of tread wear by examining the loss in wet tyre/road skidding resistance at progressive stages of tyre wear. Five tyres were tested, four highway service and one dual purpose. The characteristic initial loss in grip with wear was similar for the four highway service tyres but the dual purpose tyre, because of a rapid loss of drainage in the centre of the tread area in the early stages of wear, gave relatively a much greater loss in wet grip. In the second experiment the effect of varying the ratio of the groove to rib width in a longitudinally straight grooved tyre was examined for several numbers of ribs. The optimum ratio was found to be around 0.4 for the numbers of ribs tested, three, five or seven. The wet skid-resistance was found to be more affected by the number of grooves available rather than the groove/rib ratio, suggesting that even larger numbers of grooves than tested in this experiment would increase the grip still further. (A)

  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • WILLIAMS, T
    • Meades, J K
  • Publication Date: 1975

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 58 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00137468
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: TRRL LR 687
  • Files: ITRD, TRIS
  • Created Date: Sep 16 1976 12:00AM