Regulation No. 109-00 Proposed Supplement 8

Name:Regulation No. 109-00 Proposed Supplement 8
Description:Retreaded Tyres - Commercial Vehicles. Proposed Supplement 8 to the 00 Series.
Official Title:Proposal for Supplement 8 to the 00 Series of Amendments to Regulation No. 109 (Retreaded Tyres for Commercial Vehicles and their Trailers).
Country:ECE - United Nations
Date of Issue:2016-12-22
Amendment Level:Original
Number of Pages:7
Vehicle Types:Bus, Component, Heavy Truck, Light Truck, Trailer
Subject Categories:Drafts and Proposals (Current)
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Keywords:

paragraph, tyre, read, amend, test, slip, load, tyres, average, speed, index, control, ratio, candidate, annex, reference, vehicle, acceleration, standard, single, distance, equal, axle, case, snow, runs, fitment, minimum, system, traction, commercial, driven, greater, lock, marking, fitted, vehicles, wheel, range, differential, calculated, tests, symbol, variation, pressure, measured, compared, procedure, gear, regulation

Text Extract:

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ECE/TRANS/WP.29/2017/9
PROPOSAL FOR SUPPLEMENT 8 TO THE ORIGINAL VERSION OF
REGULATION NO. 109
(RETREADED TYRES FOR COMMERCIAL
VEHICLES AND THEIR TRAILERS)
ADOPTED AT THE 171 SESSION – MARCH 2017
PROVISIONAL DATE OF ENTRY INTO FORCE: OCTOBER 10, 2017

Paragraph 2.2.1., amend to read:
"2.2.1. In the case of tyres with a speed capacity greater than 150km/h (speed symbol "Q" and
above, plus "H") the test procedure shall be as given in Paragraph 3. of this Annex."
Paragraph 3., amend to read:
"3. Load/speed test programme for tyres having a speed capability greater than 150km/h
(speed symbol "Q" and above, plus "H")."
Paragraph 3.1.1., amend to read:
"3.1.1. All tyres having a load index in single fitment equal to or less than 121;"
Paragraph 3.1.2., amend to read:
"3.1.2. Tyres having a load index in single fitment equal to or greater than 122 and having the
additional marking "C" or "LT" referred to in Paragraph 3.2.14. of this Regulation."
Annex 7, Appendix 1, amend to read:
"Endurance-test Programme
Load index
122 or more
121 or less
Speed
symbol
Test-drum speed [km/h ]
Radial-ply
Diagonal (bias ply)
and bias belted
Load placed on the wheel as
a percentage of the load
corresponding to the load index
7h 16h 24h
F
32
32
G
40
32
J
48
40
K
56
48
L 64 –
M 72 –
66%
84%
101%
F
32
32
G
40
40
J
48
48
K
56
56
L
64
56
70%
88%
106%
4h
6h
M
80
64
75%
97%
114%
N
88

75%
97%
114%
P
96

75%
97%
114%

Paragraph 4.2., amend to read:
"4.2. Methods for Measuring Snow Grip Index
Snow performance is based on a test method by which the average acceleration in an
acceleration test, of a candidate tyre is compared to that of a standard reference tyre.
The relative performance shall be indicated by a Snow Grip index (SG).
When tested in accordance with the acceleration test in Paragraph 4.7. below, the average
acceleration of a candidate snow tyre shall be at least 1.25 compared to one of the two
equivalent SRTTs – ASTM F 2870 and ASTM F 2871."
Paragraph 4.4.1., amend to read:
"4.4.1. Test Course
The test shall be done on a flat test surface of sufficient length and width, with a maximum
2% gradient, covered with packed snow."
Paragraph 4.7.2.1., amend to read:
"4.7.2.1. The test shall be conducted with a standard two axle commercial vehicle in good running
order with:
(a)
(b)
(c)
(d)
Low rear axle weight and an engine powerful enough to maintain the average
percentage of slip during the test as required in Paragraphs 4.7.5.1. and 4.7.5.2.1.
below;
A manual gearbox (automatic gearbox with manual shift allowed) having a gear ratio
covering the speed range of at least 19km/h between 4km/h and 30km/h;
Differential lock on driven axle is recommended to improve repeatability;
A standard commercial system controlling/limiting the slip of the driving axle during
acceleration (traction control, ASR, TCS, etc.)."
Paragraph 4.7.2.1.1., amend to read:
"4.7.2.1.1. In the particular case where a standard commercial vehicle equipped with a traction control
system is not available, a vehicle without traction control/ASR/TCS is permitted provided the
vehicle is fitted with a system to display the percentage slip as stated in
Paragraph 4.3.4. and a mandatory differential lock on the driven axle used in accordance
with operating procedure. If a differential lock is available it shall be used; if the differential
lock, however, is not available, the average slip ratio should be measured on the left and
right driven wheel."
Paragraph 4.7.4.2., amend to read:
"4.7.4.2. The driven tyres inflation pressure shall be 70% of the one written on the sidewall. The steer
tyres are inflated at nominal sidewall pressure.
If the pressure is not marked on the sidewall, refer to the specified pressure in applicable
tyre standards manuals corresponding to maximum load capacity."

Paragraph 4.8.3., amend to read:
"4.8.3. Calculation of the "Average AA"
If R1 is the average of the "AA" values in the first test of the reference tyre, R2 is the
average of the "AA" values in the second test of the reference tyre, the following operations
are performed, according to Table 1:
…"
Paragraph 4.8.6., amend to read:
"4.8.6. Calculation of the Slip Ratio
The Slip Ratio can be calculated as the average of Slip ratio as mentioned in
Paragraph 4.3.4. of this Annex or by comparing the average distance referred to in
Paragraph 4.7.5.3. of this Annex of the minimum six runs to the distance of a run done
without slip (very low acceleration)
⎡ Average distance - No slip distance⎤
S lip Ratio % = ⎢
× 100
No slip distance



No slip distance means the wheel distance calculated on a run done with a constant speed
or a continuous low acceleration."
Paragraph 4.9.2., amend to read:
"4.9.2. Principle of the Approach
The principle lies upon the use of a control tyre and two different vehicles for the
assessment of a candidate tyre in comparison with a reference tyre.
One vehicle can fit the reference tyre and the control tyre, the other the control tyre and the
candidate tyre. All conditions are in conformity with Paragraph 4.7. above.
The first assessment is a comparison between the control tyre and the reference tyre. The
result (snow grip index 1) is the relative efficiency of the control tyre compared to the
reference tyre.
The second assessment is a comparison between the candidate tyre and the control tyre.
The result (snow grip index 2) is the relative efficiency of the candidate tyre compared to the
control tyre."
Retreaded Tyres - Commercial Vehicles. Proposed Supplement 8 to the 00 Series.