Tire Technology International
  • News
    • A-D
      • Appointments
      • Apps
      • Awards
      • Business
      • Certification
      • Components
      • Corporate Social Responsibility
      • Data management
      • Design
      • Distribution
    • E-N
      • Education
      • Factory logistics
      • Headquarters
      • Industry 4.0
      • Investments
      • Machine Vision & Inspection
      • Manufacturing Facilities
      • Materials
      • New tires
    • O-S
      • OE Fitments
      • Partnerships
      • People
      • Regulations
      • Research & Development
      • Retreading
      • Sales facilities
      • Show News
    • S-Z
      • Simulation
      • Sustainability
      • Testing & Analysis
      • Tire Building
      • Tire handling
      • Tire Modeling & Digital Tools
      • Tire Recycling
      • TPMS & Electronics
  • Features
  • Online Magazines
    • July 2023
    • March 2023
    • Annual Showcase 2022
    • November 2022
    • October 2022
    • 年国际轮胎技术年刊
    • Archive Issues
    • Subscribe Free!
  • Opinion
  • Videos
  • Supplier Spotlight
  • Events
LinkedIn Facebook Twitter
  • Automotive Interiors
  • Automotive Testing
  • Autonomous Vehicle
  • Automotive Powertrain
  • Professional Motorsport
  • Media Pack
LinkedIn Facebook
Subscribe
Tire Technology International
  • News
      • Appointments
      • Apps
      • Awards
      • Business
      • Certification
      • Components
      • Corporate Social Responsibility
      • Data management
      • Design
      • Distribution
      • Education
      • Factory logistics
      • Headquarters
      • Industry 4.0
      • Investments
      • Machine Vision & Inspection
      • Manufacturing Facilities
      • Materials
      • New tires
      • OE Fitments
      • Partnerships
      • People
      • Regulations
      • Research & Development
      • Retreading
      • Sales facilities
      • Show News
      • Simulation
      • Sustainability
      • Testing & Analysis
      • Tire Building
      • Tire handling
      • Tire Modeling & Digital Tools
      • Tire Recycling
      • TPMS & Electronics
  • Features
  • Online Magazines
    1. March/April 2025
    2. November 2024
    3. Annual Showcase 2024
    4. October 2024
    5. July 2024
    6. March 2024
    7. 年国际轮胎技术年刊
    8. Subscribe Free!
    Featured
    28th April 2025

    In this Issue – March/April 2025

    Online Magazines By Web Team
    Recent

    In this Issue – March/April 2025

    28th April 2025

    In this Issue – November 2024

    11th December 2024

    In this Issue – Annual Showcase 2024

    21st November 2024
  • Opinion
  • Videos
  • Awards
    • Tire Technology International Awards 2025
    • 2024 Winners
    • 2023 Winners
    • 2022 Winners
    • 2020 Winners
    • Previous Winners
  • Supplier Spotlight
  • Events
LinkedIn Facebook
Subscribe
Tire Technology International
Design

Clever concepts

Joe WalterBy Joe Walter26th April 20174 Mins Read
Share LinkedIn Twitter Facebook Email

TTI‘s resident columnist Joe Walter considers the application of symmetry and asymmetry in tire design.

Symmetry in various forms occurs in nature and in man-made products. It permeates disciplines ranging from the visual arts and music to biology and the physical sciences. Tires themselves are rotationally symmetric bodies of revolution. Birds, butterflies and human beings possess so-called bilateral symmetry dividing their shapes into left and right halves that are mirror images of one another – although internal organs are usually arranged asymmetrically. Bilateral symmetry is easily recognized and is thought to have evolved in animals because it conferred advantageous movement – known as ‘directed locomotion’ with the potential for streamlining. Most automobiles, airplanes and ships are also outwardly symmetric about their vehicle pitch plane.

Tire tread patterns can exhibit various types of symmetry depending on the product line. The most important class, known as combined point and rotational symmetry, is used on the vast majority of car, truck and SUV tires. Importantly, tires with tread patterns featuring this two-fold symmetry can be mounted in multiple ways on a vehicle (left or right; front or rear) – a convenience preferred by most consumers. Geometrically, if the tire tread pattern remains invariant after a 180° rotation about a fixed point, the pattern is both point and rotationally symmetric. Some everyday non-automotive objects also possess this dual symmetry, including the face cards in a deck of cards. In other words, like most tread patterns, these cards remain the same when turned upside down.

The two-dimensional footprint of a directional tire exhibits so-called line or mirror symmetry – the planar analog of bilateral symmetry. Directional tread patterns, often used on high-performance tires, feature V-shaped ribs and grooves symmetrically disposed shoulder-to-shoulder about the centerline of the tread. Such imagery is characteristic of line symmetry; it infers that each half of a 2D pattern is a reflection of the other. Directional tires with their striking tread patterns are designed to roll one way only, and because of this limitation remain niche products in the automotive market. The medial line of a tire cross-section also exhibits mirror symmetry.

Asymmetric tire tread patterns possess no point, rotational or mirror symmetry and have a limited, but growing, market-driven appeal. The outboard portion of such treads is generally ‘blockier’ to enhance dry cornering, while the inboard region features smaller blocks with grooves and sipes that promote wet traction. Such tires are nominally side-bound – that is, designed to operate on either the left- or right-hand side of a vehicle. The Michelin XAS was the first tire (1965) to purposefully feature tread pattern asymmetry and the first production tire to operate at 130mph (210km/h). Interestingly, the locomotion pattern of the human foot served as the inspiration for the design of the XAS.

In contrast, certain asymmetries known as conicity and ply steer, among others, unavoidably occur in radial tire lateral force behavior. These inherent offsets arise due to manufacturing imprecision and the stacking sequence and orientations of the plies, respectively. These side forces perpendicular to the wheel plane are negligibly small in bias ply tires and usually dismissed as non-issues. In radial constructions, these steering-like forces exist even at zero slip and camber angles. Ply steer, or pseudo-slip, mainly results in vehicle ‘dog tracking’ while conicity, or pseudocamber, produces torque at the steering wheel – known as ‘pull’. Fortunately, ply steer is a deterministic variable that can be determined at the design stage of tire development, while conicity is a random factory variable that is measured post-production using a tire uniformity machine.

Asymmetry can be purposefully exploited in some tire constructions for improved tire-vehicle behavior. For example, steel belts have been intentionally positioned slightly off-center during tire assembly to induce a consistently positive or negative bias in conicity values; similar results can be achieved by making tread depths slightly deeper on one shoulder than the other. These unsymmetrical features allow for balanced positioning of such tires on vehicle front axles during auto assembly operations, which mitigate steering wheel pull while driving. Furthermore, the patent literature dealing with asymmetrical tire constructions is replete with concepts never commercialized.

After spending portions of my career trying to understand, eliminate or control such nuanced tire design concepts involving symmetry and asymmetry, many of my past efforts could prove irrelevant in a future world of autonomous vehicles lacking discerning drivers.

Share. Twitter LinkedIn Facebook Email
Previous ArticleYokohama unveils iceGuard iG65
Next Article New Brawler rubber from Trelleborg for recycling industry

Related Posts

Opinion

OPINION: Extending tire life with smarter tech – a new chapter for SUVs

2nd May 20255 Mins Read
Design

Kumho concepts receive iF Design Award

21st March 20251 Min Read
Opinion

OPINION: EU regulations boost demand for tire-derived pyrolysis oil in chemical recycling

13th March 20255 Mins Read
Latest News

USTMA welcomes move to overturn EPA’s revised NESHAP rules

13th May 2025

Bridgestone debuts 70% recycled and renewable demo tire

13th May 2025

Volkswagen chooses Vredestein winter tire as OE for Tiguan SUV

12th May 2025

Receive breaking stories and features in your inbox each week, for free


Enter your email address:


Supplier Spotlights
  • VMI Group
Getting in Touch
  • Contact Us
  • Meet The Editors
  • Download Media Pack
  • Free Weekly E-Newsletter
Our Social Channels
  • Facebook
  • LinkedIn
RELATED UKI TOPICS
  • Automotive Interiors
  • Automotive Testing
  • Autonomous Vehicle
  • Automotive Powertrain
  • Professional Motorsport
  • Media Pack
© 2025 UKi Media & Events a division of UKIP Media & Events Ltd
  • Terms and Conditions
  • Privacy Policy
  • Cookie Policy
  • Notice & Takedown Policy

Type above and press Enter to search. Press Esc to cancel.

We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
Cookie settingsACCEPT
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the ...
Necessary
Always Enabled

Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.

CookieDurationDescription
cookielawinfo-checkbox-necessary1 yearSet by the GDPR Cookie Consent plugin, this cookie records the user consent for the cookies in the "Necessary" category.
elementorneverThe website's WordPress theme uses this cookie. It allows the website owner to implement or change the website's content in real-time.

Advertisement

Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.

CookieDurationDescription
OAGEOsessionOpenX sets this cookie to avoid the repeated display of the same ad.
OAID1 yearCookie set to record whether the user has opted out of the collection of information by the AdsWizz Service Cookies.
test_cookie15 minutesdoubleclick.net sets this cookie to determine if the user's browser supports cookies.
VISITOR_INFO1_LIVE5 months 27 daysYouTube sets this cookie to measure bandwidth, determining whether the user gets the new or old player interface.
YSCsessionYoutube sets this cookie to track the views of embedded videos on Youtube pages.
yt-remote-connected-devicesneverYouTube sets this cookie to store the user's video preferences using embedded YouTube videos.
yt-remote-device-idneverYouTube sets this cookie to store the user's video preferences using embedded YouTube videos.
yt.innertube::nextIdneverYouTube sets this cookie to register a unique ID to store data on what videos from YouTube the user has seen.
yt.innertube::requestsneverYouTube sets this cookie to register a unique ID to store data on what videos from YouTube the user has seen.

Analytics

Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.

CookieDurationDescription
CONSENT2 yearsYouTube sets this cookie via embedded YouTube videos and registers anonymous statistical data.
_ga1 year 1 month 4 daysGoogle Analytics sets this cookie to calculate visitor, session and campaign data and track site usage for the site's analytics report. The cookie stores information anonymously and assigns a randomly generated number to recognise unique visitors.
_ga_*1 year 1 month 4 daysGoogle Analytics sets this cookie to store and count page views.

Functional

Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.

CookieDurationDescription
__cf_bm30 minutesCloudflare set the cookie to support Cloudflare Bot Management.

SAVE & ACCEPT
Powered by