Imprint Contact 868 Videos
900.000 Callings


Wheel change
Save Energy

Video Suspension

Video Tyres 1
Video Tyres 2

Video History of Wheels 1
Video History of Wheels 2
Video History of Wheels 3
Video History of Wheels 4
Video History of Wheels 5
Video History of Wheels 6

Video Tyre label
Video History Sec. Wheels
Video Winter Tyre
Video Snow Chains
Video All-weather Tyres
Video Where to mount new

Video Radial Ply Tyre
Video Cross-ply Tyre
Video Low Cross-section
Video Tyre fitting
Video Additional information
Video Wheel Balancing
Video Bus Wheel Balancing
Video Tyre Production 1
Video Tire Production 2
Video Speedlimits
Video Wheel Load Limits
Video Roller Reststance 1
Video Stiction
Video Emergency Running 1
Video Emergency Running 2
Video Tyre Press. Control 1
Video Tyre Control 2
Video Tyre Press. Control 3
Video Rims
Video Alloy Rim
Video Alloy Rim (production)
Video Drop-center Rim
Video Spoked wheel
Video Rim Hump
Video Rim (truck)
Video Emergency Wheel
Video Offset
Video Wheel Positions
Video Wheel-measuring
Video Wheel Base
Video Steering Offset
Video Castor
Video Steering axis incl.
Video Wheel Alignment
Video Relative Steering Angle
Video Track
Video Camber
Video Obl./Side slip angle
Video Axle Alignment 1
Video Axle Alignment 2
Video Axle Alignment 3

Video Tyre Calculation
Video Inch -> mm
Video Slip
Video Axle Load Distrib.
Video Payload Distrib.
Video Roller Resistance 2

Video Wheels
Video Wheels 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Low Cross-section Tyres


Of course these wheels have a number of special features to marvel at, compared with a normal run-of-the-mill tyre. Let's begin with the bolted rim-bowl, then we move our attention all the way out to the asymetrical tread which stipulates a certain rolling direction (rotation). However, the real reason for this picture, is the height-to- width ratio of 25%. Surely one must ask oneself, how on earth is this tyre mounted, and when will we return to the solid rubber tyre...


A tyre of this type, is e.g., the 305/25 R 20 Z. This section only explains the first two numbers. First of all, the above shown tyre measures 305 mm at its widest point (from flank to flank). This has nothing directly to do with the tread. This is applicable only under standardised air-pressure conditions on a standardised rim, which is specially stipulated for each and every tyre-width. Of course, not all 305 tyres are the same width. One speaks here, of a grid-dimension. With the description '305', all tyres from 300 to 309 mm are embraced. If one now assumes the middle width value, the height of a 25 cross-section must be 25% of the width, thus, at least 76 mm. The wider a tyre is, the lower its cross-section can be, if it's to be mountable at all.

                Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

Our E-Book advertising