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Tyre limits for plating
Page 41
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• One of the requirements for the plating of goods vehicles is that the tyres used on a vehicle shall be adequate in strength to support the plated axle weights, and the sizes, ply rating and/or code of the tyres fitted to each axle when a vehicle is presented for plating will be noted on the plating certificate. The certificate will also show any operating conditions, such as speed or radius of operation from base, for which they are suitable. This week the Ministry of Transport announced that the examiners at testing stations will, for plating purposes, be guided by the requirements for tyring set out in the Tyre and Wheel Engineering Manual in an edition which is to be published by the Society of Motor Manufacturers and Traders later this month.
The two tables in this SM MT manual which are relevant for plating purposes are table 2B and table 2J. The first applies to both new and existing vehicles in general use, and imposes no particular restrictions on the use of vehicles equipped with the listed tyres—with the proviso that different tread types (e.g. highway and heavy) may have different sustainedspeed characteristics, and operators are advised to consult their tyre suppliers in cases where they intend to use vehicles at sustained speeds of over 50 mph.
The second table (2J1 applies only to motor vehicles and trailers limited at all times to multi-stop collection and delivery work at speeds not exceeding 40 mph and used within 25 miles of their normal base: it also applies to some special-purpose municipal vehicles.
But because some vehicles and trailers first registered or used before January 1 1968, and employed on more general haulage work, may not be tyred in accordance with the standards set out in table 2B, the Ministry, in consultation with the SMMT, the TMC and operator associations, has prepared a supplementary table of tyres and plated axle weights known as GP/1. This table GP/1 was published on Tuesday and will be accepted as a guide for the purpose of plating such vehicles, subject to the use of these vehicles being limited at all times to a maximum speed of 40 mph. This table, says the Ministry, will remain operative until December 31 1972. It is apparently assumed that by this time all remaining tyres in this low-rated category on "non-2J" duties will have been used up and the vehicles either taken out of service or shod with higher-rated tyres.
It is understood that the principal operator associations, before approving the GP/1 list, made a survey of members which suggested that few, if any, were likely to be adversely affected.
Entitled Supplementary Tyre Loading Table GPO, the publication is obtainable price 2s 6d from HMSO or booksellers.