The Speed Rating is explained in detail here. For our example a speed rating of Z means this tire is rated for speeds exceeding 149mph. What do these terms alphabetical, metric and std inch mean? They are explained in a section below. The sizes in the above chart do not go as large as modern sizes (180/55 or 240/40) because new bikes are not made to use the Inch Format. The majority of modern motorcycles and dirt bikes do not use these tires. These were standard equipment on older machines. The Inch or Standard Inch Size Format does not include an aspect ratio. The aspect ratio on these tires is 100. Meaning the section width and section height are equal. The calculator adds or subtracts input durations from the time in the top window. You first enter a time in 24 hour format

In railway timetables 24:00 means the end of the day. For example, a train due to arrive at a station during the last minute of a day arrives at 24:00; but trains which depart during the first minute of the day go at 00:00. The Aspect Ratio is the tire section height divided by the section width (not tread width), multiplied by 100. The section height is measured at the center of the tire crown. The tread width is usually greater than the section width. The section width is measured from the middle side walls (above the bead, below the tread). It is The following chart shows some common tire sizes, including their width and the diameter. Very handy when choosing which tire will fit your bike, or which motorcycle rear fender to buy to fit the tire you want to run on your new build!Critical clearances, motorcycle compatibility and stability, load-bearing capacity, speed rating, radial vs. non-radial, pattern and tread compound requirements, inflation recommendations, and front-to-rear tire matching will all vary with tire selection. Dirt bike tires are sold in both metric and inch sizing format but do not always have a speed rating. More often they are rated by terrain. B- Aspect Ratio. The smaller the number the lower profile of the tire. In metric this is a ratio between height and width. ex. A 170/80 means the width is 170mm, and the height would be 80% of that. ) In addition to the information listed above, tires can contain Load Index or Rating info on the sidewall. This refers to how much weight a tire can safely transport. It includes the weight of the bike and rider(s). Not all tire manufacturers make tires in all load indices. Dunlop, for example, starts at 33. Load

Enter a time in three parts: the hours in left field, minutes in the middle, and seconds in the right field.However, the U.S. military prefers not to say 24:00 - they do not like to have two names for the same thing, so they always say "23:59", which is one minute before midnight. British motorcycle rims (Triumph, BSA, Norton etc.) are marked with a letter and number designation. This is helpful to know what tires you can mount on your rim based on the manufacturer's specs. WM0 Enter the time by pressing "Enter a time". The time is placed in the top window, replacing what was there. The vast majority of tires manufactured and sold today come with metric sizing. The tire size we will use for our example is a 120/70ZR-17TL. It can also be written as 120/70Zx17TL or 120/70ZR17TL. multiplied by 100 to give you a whole number for the tire. So instead of .9 the tire is stamped 90.