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RETYRE
new tyres. After Regulation 117 saw the light of day it became clear that absolute measurements and testing were required. A methodology was developed where the entire process was split up into 4 important steps.
Step 1. Creation of a virtual casing
Get a clear impression of the casing influence on the environmental performances. Essential to create a reliable starting point
Elimination of unnecessary noise
Simplifying the following steps
The summary of Step 1 must lead to a Go/No Go decision
If Go, then Selection criteria will be established and tyre sizes will be selected according to their market presence; Important is the existing knowledge; BAST already performed noise emission testing in the BRV project in 2003. Since it concerns the casing the testing is focussed at BAST on rolling resistance and noise emission.
supporting (designer) tool
Mathematical interpretation of the findings
Translated into an algorithm
Prognosis
Creation of the intranet supportive tool (well validated and tested)
Support of and to BIPAVER members
These steps were difficult to
Step 2. The Process
Variations in the process will be defined according to buffing radius, undertread and the process itself (hot/cold)
Wet Grip is introduced in the measurements in compliance with Regulation 117, outdoor testing and introducing the comparison SRTT.
Selection of reduced number of sizes according to their market presence.
Step 3. The Tread Compound (shore hardness) Pattern
Width
Step 4. The creation of a
translate into a well defined testing scheme were the Go/No Go decision
could be easily implemented. With the support of the European Commission/Directorate General –Research, BIPAVER found a solution by using the FP7 Framework Programme, a programme designed just for the
385/65 R 22.5
Strongest tyre size for new and retreaded tyres in Europe; Representing the trailer application
315/80 R 22.5
Second strongest tyre size for new and retreaded tyres in Europe. Representing the drive axle application
275/70 R 22.5
Dominant tyre size in Europe for public transportation and therefore sensitive regarding rolling noise (mainly urban traffic) and Wet Grip (Safety).
Casing List
#
Tyre Dimension
New Tyre Manufacturer
Tread
Application
New tyres
Casings buffed
Casings available
Label values new tyres
0 years
2 years
3 years
4 years
DOT 12
DOT 10
DOT 9
DOT 8
31-45
275/70 R 22.5
Continental
HSU1 148/145J
Steering
4
5
5
5
19
DC 73))
61-75
315/80 R 22.5
Firestone
FD 600 154/150M
Traction
5
5
5
15
FC 73))
76-90
315/80 R 22.5
Bridgestone
M 729 154/150M
Traction
5
5
5
15
EC 78)))
91-105
315/80 R 22.5
Michelin
XDN2 156/150L
Traction
8
5
5
5
23
FC 74))
106-120
385/65 R 22.5
Bridgestone
R 164 FRT 160K
Trailer
4
5
5
5
19
CC 71))
121-135
385/65 R 22.5
Michelin
XTE3 160J
Trailer
8
5
5
5
23
CB 69)
136-150
385/65 R 22.5
Pirelli
ST35 160K
Trailer
4
5
5
5
19
CA 72))
Total number*
28
35
35
35
133
56 Retreading Business