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TIRE TECHNOLOGY EXPO
Salvadori Revisits Essen
As in the past 30 years, Salvadori Srl will be at the Reifen show in Essen located in Hall 1, Stand 419, with a brand new stand, in which the team will have the opportunity to meet both regular and new customers and answer all their questions and doubts relative to the tyre retreading world.
The team will be present to show new products and offer five suggestions about the best methods to retread, repair and mount and dismount the tyres. Since the economic crisis developed, Salvadori has also offered many ways in which to fight this period better, such as the brand new line of Gun Extruders, items, which have become essential in the tyre retreading process, and which have been produced for 30 years with the same care and precision by Salvadori Srl.
This year the brand new 685s (Salvadori) will be available, which are assigned to the old traditional line with Bosch Gun. Thanks to a new drill, made In Italy, Salvadori is able to cut the costs of production and offer the extruder to the public at a lower price, without resorting to compromises. In fact, rather than cutting the power, it has been increased.
Another interesting new item for retreaders is the new line of steel cord carbide grinders, produced with dedicated sizes.
Regarding the tyre dealer and garage sector, there is also some interesting news for them, such as the new 254sp long hydraulic bead breaker, which, thanks to a longer run, is able to de-bead new generation tyres, which have larger and heavier beads and are very difficult to demount by traditional techniques.
A range of buffing tools from Salvadori
Florian Fscher, Ruud Spuijbroek and Richard O’Connell
interest and the test will be abandoned.
In a cost comparison exercise O’Connell compared two separate vehicles with carbon cutters and conventional tyres fitted to the drive axle. Vehicles were checked for alignment and pressure. Says O’Connell; “If I make an allowance that my Carbon Cutter tyres have a life of only 80 per cent of normal tyres and cost 20% more the cost for 4 conventional tyres would be £300 x 4 = £1200 over 2 years. The Carbon Cutters costing 20% more and a 20 per cent allowance for lost mileage would cost £1728 over two years – i.e. £264 per annum more than the conventional tyres.
However, if the operator sees a 2.5 per cent improvement in fuel costs, on a £60K per annum fuel bill the saving is £1500 per annum. Taking away the extra cost of £264 per annum, this means a final saving of £1236 p.a.. With the drive axle accounting for 33% of the vehicles costs, the saving if the whole vehicle were fitted with Cost Cutters would theoretically be £3745 per truck per year.
However, O’Connell points out that most premium drive axle tyres have a tread depth of around 22mm. If a replacement drive axle tyre is fitted with a tread depth of 16 mm this will give a misreading of the tachograph by 1 per cent plus the reduced tread depth will improve fuel consumption
by 2 per cent, giving an apparent 3 per cent saving with no technology input whatsoever.
It is therefore important to check tread depths of replacement tyres before any test. Tread depth has a significant effect on tyre fuel economy. Bridgestone tests show that as a tread wears, the fuel efficiency of a tyre usually increases.
So to do a test require tyres of same tread depth, same width, same diameter, same tread radius, same pressure, same operating conditions, same speed and a full set of tyres Wear and rolling resistance, says O’Connell, are the most important parameters for truck tyres. A third of the fuel cost is simply to roll the tyres. Most of the reduction in rolling resistance is achieved by modifying the tread compound. However, modifying the tread compound to significantly reduce the tyre rolling resistance can result in tread chunking plus a loss of traction. As a result, energy saving tyre patterns are developing as a compromise between grip and fuel economy. The higher the fuel saving that the manufacturer hopes to achieve, the more this must be reflected in a tread pattern with few lugs. More luggy designs give the danger of chunking if the rolling resistance isn’t to be compromised As a conclusion Richard O’Connell pointed out several key points; A drive axle tyre with a reduced tread depth will give an apparent fuel
saving, an energy saving traction truck tyre runs the risk of tread chunking requiring premature removal, vehicle traction may be compromised, newly fitted energy saving tyres may initially show worse
fuel consumption than the worn out tyres being removed and trailers fitted with energy saving tyres must stay with similarly fitted out tractor units to show the true benefits.