Blackcircles.com Tyre Glossary D-O
Hysteresis: In reference to Actions and reactions: not all energy applied to a tyre is dispersed. When dealing with an elastic material like rubber energy is always absorbed and this creates heat build-up.
Inner Liner: The layer of rubber inside a tubeless tyre which stops air seeping out of the tyre during normal use.
Load Index: Indicated on the Tyre Wall a standardised numerical guide that indicates the maximum weight a tyre can carry at the speed specified by its speed rating under conditions specified by the manufacturer.
Low Profile Tyres: These are tyres with shallow sidewalls usually fitted to high performance vehicles.
Maximum Inflation Pressure: Exactly what it says, the maximum pressure a tyre can be inflated to.
Mid Range Tyres: Tyres which retail at a lower price than premium brands; the performance of this range shall logically be lower.
“Mini” Spare (also known as A Space Saving tyre): Smaller than the road tyres, this type of Tyre is designed to save space and reduce weight in the vehicle. A temporary measure to get you home these tyres should be changed as soon as possible, these tyres also have a lower maximum speed.
“M+S” Tyre: Tyres which have been designed to perform better in Mud and Snow.
Nominal Section Width: The section width of an inflated tyre mounted on its theoretical rim and indicated in the tyre size designation.
Nominal Rim Diameter: A size code figure for reference purposes only, as indicated in the tyre and rim size designation.
Original Equipment (OE): This is the original brand of tyre that was fitted by the car manufacturer. Please note that there may be more than one OE brand fitment.