By the end of a course in Reading Dynamics, breathless students were “reading” Orwell’s Animal Farm at the rate of 1,400 words a minute, and telling tales of revolution. To achieve this, Wood promoted a technique of running a finger down the middle of a page to “activate peripheral vision”. Print should be consumed in blocks rather than words and sentences. We had to stop “subvocalising” – “saying” words out loud in our heads as our eyes moved across the page – as well as learning to outlaw the pauses and detours that led to us reread phrases when our minds drifted or our understanding snagged. The way in which we read, she professed, in the managerial spirit of the moment, was inefficient in terms of time and motion. Consult the tire manufacturer for maximum speed when there is no service description.With Doug, her husband, Wood opened her Reading Dynamics institutes across the US and beyond in the 1950s and 60s, and her methods became a self-help craze. Tires with a maximum speed capability higher than 300 km/h (186 mph), require a "ZR" in the size designation. Below are examples of tire sizes with a “ZR” speed rating.įor tires with a maximum speed capability higher than 240 km/h (149 mph), a "ZR" may appear in the size designation. Tires with a maximum speed capability over 186 MPH are required to include “ZR” in the designation. Tires having a maximum speed capability over 149 MPH may have “ZR” in the size designation. Here, the tire would have a speed rating of V. Below is an example of a the description on a tire’s sidewall: 2015/60R15 91V. If you’re reading your tire sidewall, the speed rating will be the last item in the character sequence in the tire’s size code. Recent standardization has changed so all ratings except "Unlimited ZR" incorporate the speed symbol and load index as part of every tire’s service description on the tire’s sidewall. You can find your tire speed rating in a number of places, typically in the owner’s manual, driver’s side doorjamb, glove box door, and gas tank hatch. (Always consult the manufacturer for the maximum speed of Unlimited Z tires.) Where Can I Find My Tire Speed Rating? The "Limited V" category of 250 km/h (149 mph) was then created, and eventually the "Z" speed rating was added as the top speed rating. When the rating system was originally developed, the "Unlimited V" category of over 210 km/h (130 mph) was the top speed rating possible.Īs manufacturers developed bigger and better tires, it became necessary to regulate performance at standardized speeds to ensure safety.
The speed rating system used today was developed in Europe in response to the need to control the safe performance of tires at standardized speeds.
It does not indicate the total performance capability of a tire. This rating system (see below) shows the top speed for which a tire is certified. A tire’s certified speed rating is given a letter from A to Z, ranging from 5km/h (3mph) to above 300 km/h (186 mph). The speed rating system was developed to help control the safe performance of tires at standardized speeds. The higher the speed rating, the better control and handling you’ll have at higher speeds. In short, it’s the fastest speed a tire can handle before it no longer performs as designed. A Simple Explanation of Tire Speed Rating What Is Tire Speed Rating?Ī tire’s speed rating indicates the optimal speed that the tire can safely maintain over time.
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