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The first number (180) is the width of the tire in millimeters. The second number (70) is the aspect ratio, which is the height of the sidewall. The height is 70% of the width or 126mm high. The third number (16) is the rim size.

## How are motorcycle wheels measured?

Measuring a rim only takes a few steps.

- Remove the tire from the rim.
- Lay the rim on a flat surface.
- Measure the diameter of the rim. Do this by measuring the distance between the widest point of the rim. Measure from the bed where the tire will sit. Do not measure from the outermost portion of the rim.

## How is a wheel size measured?

Wheel or rim diameter is the distance measured in inches across the face of the wheel, from bead seat to bead seat. It’s measured this way because that’s where the tire and the wheel come together. … (PRO TIP: You can find your wheel’s diameter on the back side of the wheel, usually stamped on one of the spokes.)

## How do you read a bike wheel size?

The first number is the diameter of your wheel. Sizes such as 26, 24, 20, 27.5, 29 and 700c are common tire diameters. The second number (after the X) is the width of your tire. The range for widths is usually between 1 and 3 inches.

## What do wheel size numbers mean?

The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire’s width. The bigger the aspect ratio, the bigger the tire’s sidewall will be.

## Where is rim width measured?

Rim width is the distance from the outboard bead seat to the inboard bead seat. Just as with rim diameter, rim width is not measured at the overall width of the wheel (you only should be concerned with the seating width that the wheel offers for the tire beads).

## How do you measure wheel width on a bike?

The external rim width (EW) is the distance from the outside of one wall to the outside of the other rim wall. Take the internal rim width and add the thickness of the rim walls, and voila — you get the external width. The EW is the top number measured across the rim.

## What is the standard rim size?

Wheel diameter is referred to in inches. Diameter of the ‘rim’ in inches (excluding the tyre). Standard road cars generally have wheels that are between 14 inch and 19 inch in diameter.

## Is 26 inch wheel bike for adults?

26″+ Wheel Cycles – Suitable for ages 11+ (These are classed as adult cycles.)

## What is the difference between 406 and 451 wheels?

Since they’re larger, 451 tires carry more momentum and deliver more comfort than 406, yet they’re small enough for convenient portability, punchy acceleration, and nimble handling.

## What does 700x28c mean?

700x28c simply means the size of your bicycle tire, according to what’s known as the ‘French system’. “700” is the overall diameter of the bike tire, measured in millimeters. … The “c” is part of the old French system that classified widths of tires from “a” (being the narrowest) to “d” (which was the widest).

## How do I know my rim size?

The two easiest ways are to check the sticker plate in your car, it should be located inside the driver side door, or look online for the vehicle specifications for your exact make and model. That should tell you the standard rim size.

## What does 50r mean on tires?

50 is the two-figure aspect ratio. This percentage compares the tire’s section height with the tire’s section width. For example, this aspect ratio of 50 means that the tire’s section height is 50% of the tire’s section width. R indicates the construction used within the tires casing. R stands for radial construction.

## What does the 265 70R17 mean?

How to read your tire size long description. An arrow points to the numbers 265/70R17 115T on the inner part of the tire sidewall. 265 is the width, 70 is the aspect ratio, R stands for radial, 17 is the wheel diameter and 115T is the load index and speed symbol.