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Mat

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  3. offset

    in Tyres / Wheels

    Posted

    ps..why does the tyre and wheel industry use two different measuring units !!!

     

    First, the US has been the major market for tires for most of the past century.

     

    Second, although scientists and technologists in the US have embraced the metric

    system, the common man in the street (including members of Congress) know

    little or nothing about the metric system and actively resist any changes from the

    English (as we call them here) system of weights and measurements.

     

    Third, government bureaucracies have cast English units into law making it very

    difficult to change to metrics given the feeling of the voters. This includes the

    powerful US Department of Transportation (D.O.T.).

     

    Before the introduction of European made radial tires for passenger cars into the

    US in the 1960s, American-made tires used English units to denote the size of a

    tire. Some size examples are: 6.00X13, 8.25X14, 5.60X15, 7.00X14, 7.50X15,

    6.00X15 The first 3 numbers of the size measured the width of the tire casing at

    its widest point. For example, the 6.00 of the size 6.00X13 is 6 inches wide. This

    called the section width. The 13 of a 6.00X13 is the diameter of the wheel, in

    inches, that the tire is to be mounted on. For each diameter of tire there was only

    one standard width!

     

    While domestic tire manufacturers and the D.O.T. were changing the tire sizing

    systems from Numeric to Alpha-Numeric during the 1960's, the European tire

    manufacturers went to a Metric system of sizing predominantly because of

    radialization. Some metric size examples would be: 165SR13, 175/70SR13,

    185SR14, 195/70SR14, 155SR15, 215/60HR15, 165SR15.

     

    You will notice there is little similarity here in some of the numbers to numeric or

    alpha-numeric sizing except for the last 2 digits; 13,14 or 15 which is still the

    diameter of the wheel, in inches, that the tire is to be mounted on. However,

    where the numeric system used a 6.00 or 7.00 to denote the cross- section of a tire

    in inches, the Metric system uses the numbers 165 from the 165SR13 to denote

    the measurement of the cross-section in millimeters.

     

    Thus because historically Americans did not need to know about tire dimensions,

    except for the wheel diameters, European tire manufacturers were able to use

    metric dimensions for tires except for the diameter which was written into

    previous US law to be measured in inches. Thus, all European manufacturers

    needed to do to get into the vast US market, which did not produce radial tires at

    that time, was to change one number on the tire into inches to meet US law.

     

    Also, the 1960 radialization and technology increased the tire manufacturer's

    ability to improve the performance of the tire dramatically by increasing the

    section width and reducing the sidewall height of the tire. This change of the

    aspect ratio needed to be reflected when stating the size. An example of section

    width increase in size on the same wheel diameter would be 155"82"SR13 or

    155SR13 to 175/70SR13 or 205/60R13. All 3 sizes essentially have the same

    sidewall height but notice the section widths increased from 155 mm to 175 mm

    and 205 mm as the aspect ratio respectively changed from "82" to 70 to 60. The

    overall tire diameters of these 3 sizes should be within 3% of each other.

    However, this 3% difference in diameter did cause some problems for the general

    public in the US because standard automobile odometers indicated less mileage

    using the reduced diameter of radial tires. The general public thought that the

    radial tires were reducing their car’s fuel economy.

     

    Today, the global market, and concerns about tire safety have resulted in an

    ongoing series of international meetings trying to standardize tire parameters,

    including loading.

     

     

    Reference: http://www.dunloptire.com/lib rary.html

  7. ARB's

    in Suspension

    Posted

    by the way its for the vitz, maybe should have said that :D

     

    according to the TRD parts list for the Netz cup cars there was never a rear ARB, or Front ARB listed

     

    however the Yaris T-Sport did have a front bar fitted as standard, so i would imagine the Vitz has one aswell

  8. ARB's

    in Suspension

    Posted

    an old trick...is doubling up the std bars and using jubilee clamps to hold the 2 together....

     

    it works aswell.

     

    and if your a bit handy with CAD or something you can have aluminium blocks made up to mount the 2 bars , a bit les ghetto

     

    Rx7stuff027.jpg

     

    another option is universal, racing spec anti roll bars and make up the mounts yourself..

     

    dsc02800xb6.jpg

     

    dsc02801mp5.jpg

    Norfolk Arena Bonfire Burnout

    in Drifting & Track Days

    Posted

    Bonfire Burnout @ Norfolk Arena

     

    Norfolk Arena are holding a drift event open to all class of drivers ( who ever you drive for)

     

    The Date

    Friday 7th November = open evening floodlit practice.

    Saturday 8th November = The Main event practice & qualifying from 9.30am

     

     

    There will be TOP Prizes for the top 3 drivers in Amateur and Pro Class (non licence holders welcome.)

    Also Prizes for best entertainers and crowd pleaser's.

     

    Event Format =

    Morning practice from 9.30am.

    qualifying for all drivers.

    main event to start from 7.30pm (gates open to public 5.30pm).

    Parade for all drivers and introduction.

    Top 16 drivers in pro class (twin).

    Top 8 In Am class.

    Open freestyle comp to be judged by the public!!! (open to non qualifiers).

    Semi's & final battles.

    Massive Firework display, and presentation ceremonies.

    After party in the main bar till late.

     

     

     

    Top Class facilities:

    Free camping available.

    Showers & clean toilets.

    on site catering.

    4 licensed bars.

    dedicated merchandise stands.

    credit card facilities.

    Disabled facilities & Baby Change.

    Secure parking.

    CCTV.

    Terraced viewing areas.

    500 seater grandstand.

     

     

    for further information please call Nathan :01553 771111

    or Email: nathan@norfolkarena.co.uk

     

     

     

    Trade Stands welcome call for details

  22. Colway Tyres.....

    in Tyres / Wheels

    Posted

    "..............C-Tyres Calls In Administrator

     

     

    Fri, 26 October 2007

     

    C-Tyres, the Langley Moor, Durham-based manufacturer of the Colway brand of car and truck tyre retreads, yesterday called in the Administrator.

     

     

     

    Gary Oliver, managing director of C-Tyres, told T&A that the company had been served with a forfeiture notice by its landlord at the weekend and had been unable to gain access to the site. With no access to the factory, stock and customer records, the directors of C-Tyres were forced to call in the Administrator. Said Oliver: "Because we couldn't get on to the site, we couldn't even access our employees' contact details to tell them not to come to work." C-Tyres employs around 100 staff.

     

    The current management team took over C-Tyres in January 2002, when the company was turning over £3 million annually. "This year we were on course for a £6 million turnover and were making an operating profit" Oliver told T&A. During this time, C-Tyres concentrated its efforts on niche products and actually increased the product range, adding truck retreads.

     

    Gary Oliver was on his way to meet the Administrator when T&A spoke to him, but says that the company will continue to trade while in Administration and that it will eventually be sold as a going concern. In addition to the Colway product range, C-Tyres operates a casing collection service and has an on-site waste disposal facility, which Oliver believes makes the company attractive to a prospective buyer looking to reduce its carbon footprint.

     

    Things will be clearer after the initial meeting with the Administrator and Gary Oliver said that he would get in touch with C-Tyres's customers as soon as the Administration process is set up............."

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