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Tyre Topic Index
Posted: Wed Apr 29, 2009 7:16 pm
by -Scott-
Posted: Fri Jun 05, 2009 9:15 am
by chimpboy
Various info culled from around the internet that might be helpful to some, of course it's common knowledge to many who've been around a while. Please move this if I shouldn't have put it here.
Tyre dimensions terminology:
Load ratings (on commercial tyres):
Code: Select all
LI kg LI kg LI kg LI kg LI kg
50 190 65 290 80 450 95 690 110 1060
51 195 66 300 81 462 96 710 111 1090
52 200 67 307 82 475 97 730 112 1120
53 206 68 315 83 487 98 750 113 1150
54 212 69 325 84 500 99 775 114 1180
55 218 70 335 85 515 100 800 115 1215
56 224 71 345 86 530 101 825 116 1250
57 230 72 355 87 545 102 850 117 1285
58 236 73 365 88 560 103 875 118 1320
59 243 74 375 89 580 104 900 119 1360
60 250 75 387 90 600 105 925 120 1400
61 257 76 400 91 615 106 950 121 1450
62 265 77 412 92 630 107 975 122 1500
63 272 78 425 93 650 108 1000 123 1550
64 280 79 437 94 670 109 1030 124 1600
Speed symbols:
Code: Select all
SSY Maximum Speed for Passenger Tyres
M 81mph 130km/h
P 93mph 150km/h
Q 99mph 160km/h
R 106mph 170km/h
S 112mph 180km/h
T 118mph 190km/h
H 130mph 210km/h
V 150mph 240km/h
W 169mph 270km/h
Y 187mph 300km/h
ZR >150mph >240km/h
Sidewall markings:
Code: Select all
eg. 205/55 R15 87V
205 - Nominal Section-width in mm.
55 - Aspect ratio (Tyre height is 55% of tyre width).
R - Means it's a radial tyre.
15 - Rim diameter Code (in inches).
87 - Load Index. Maximum load of this tyre
V - Speed Symbol. Indicating maximum speed.
TWI
TWI = Tread Wear Indicator. Cross ribs evenly spaced around the circumference of the tyre in the longitudinal tread grooves and becoming exposed when the remaining tread depth is down to 1.6mm.
DOT
DOT = Department of Transportation, USA.
026504
Approval number acc. to ECE regulation 30.
TUBELESS
Tubeless. TUBE TYPE tyres must be mounted with tubes.
(E)4
All passenger car tyres from current production comply with ECE Standard 30. All tyres are marked with a circle containing an E and the number of country of homologation. A multi digit homologation number follows this marking.
E.g. (4=Netherlands)
1607 (after the DOT number)
Date Code - this code comprises 4 digits, i.e. the first 2 digits for the week and the second 2 digits for the year (so "1607" means the 16th week of 2007.) For tyres produced in the 1990s, the date code is three digits plus a triangle ie "207<" (where the "<" is a triangle) means the tyre was manufactured in the 20th week of 1997.
There are many
tyre size calculators out there to help with the mm/inch and aspect ratio issues. Heck metric tyres still incorporate an inch measurement for the nominal rim size.
Some good calculators are:
http://www.1010tires.com/tiresizecalculator.asp (this one has all the odd sizes like 10R15 built in as well).
http://www.exploroz.com/Vehicle/Tyres/SizeCalc.aspx
http://www.etyres.co.uk/tyre-size-calculator.htm (compare two metric sizes)
Posted: Sun Jun 07, 2009 11:26 am
by 80's_delirious
Why not make this a sticky at the top of Gen Tech so it is more visible?
Posted: Sun Jun 07, 2009 1:50 pm
by -Scott-
Stickies don't get read.
If somebody actually reads the stickies, they'll read the Bible, and should find this thread anyway.
Posted: Fri Jun 12, 2009 9:08 pm
by bogged
-Scott- wrote:Stickies don't get read.
If somebody actually reads the stickies, they'll read the Bible, and should find this thread anyway.
I'd rename the bible to FAQ page or something that gives them the idea what its about...
Posted: Sat Jun 13, 2009 9:26 am
by grimbo
I still reckon the only way to get people to red these is to call them Free P0rn or the like
Posted: Sun Jul 19, 2009 7:40 pm
by mike_nofx
Posted: Sun Jul 19, 2009 7:45 pm
by -Scott-