The calculator adds or subtracts input durations from the time in the top window. You first enter a time in 24 hour format 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. Not all manufacturers will add the TL to indicate that it is tubeless. It was used more when they were not as common as today. Inch Size Format

The speed rating is explained in detail below, but in our example, a speed rating of H means this tire is rated for speeds not to exceed 130mph or 210kph. To most people, the numbers and letters on the side of their tires are cryptic and indecipherable. These motorcycle tire sizes comparison charts below will help you understand the codes on the side of your tires to be sure you know which tires you are currently using, and which others will fit your motorcycle. Sometimes a catalog will list a tire as TL, BL or RWL. These have nothing to do with the size or handling. They are strictly descriptive. They describe the look or another feature of the tire. Abbreviation

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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. ) The above tire size conversion chart does not mean that these tires are universally interchangeable. They are to give you a point of reference when upgrading your older tires. Consult your motorcycle’s manual or manufacturer’s customer service

Size may be indicated in inches, metric, or by letters (alpha). It is helpful to know how these compare with each other so you can compare different brands of tires and see which might be the best fit for your bike. This chart shows the approximate comparison of the different size indicators. Motorcycle Street Tire Sizes Conversion Chart 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. 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. 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 isThe 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.

The section width and rim size are defined in the same manner as described for the Alpha and Metric size formats. 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.Some manufacturers put the speed rating at the end of the size and do not indicate if the tire is tubeless or not. In that case the size would look like this 120/70-17Z. 120 Enter a time in three parts: the hours in left field, minutes in the middle, and seconds in the right field. 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. Also, inch size format tires are all bias type. They do not come in radial. The size will will use for this example is 4.60x17H 4PR. You may also see this written as 4.60H-17 4PR. 4.60