Also find vehicle speedometer error and available alternate tire sizes. The term 27.5″ is more of a marketing label intended to show that they are halfway between 26″ and 29″ in terms of performance.

The ISO sizing system provides a measurement that looks like 30–584, which you’ll find on both rims and tires. I wish someone had sat me down and told me that at the very beginning. What are Fat Tire Bikes and Why are they so Popular? These size labels come from an old French sizing standard, which we’ll cover in more detail in the French sizing section. CARS.COM — Larger wheels give cars a more aggressive stance and greater stage presence, which is why automakers install king-size rims on concept cars.

Decimals (26×1.75) are not interchangeable with Fractions (26×1¾) despite being mathematically identical.

The following diagram depicts how ISO measurements are interpreted on bike rims. The most common question I receive regarding mountain bike wheel sizes is: which size is best to use, and why?

Dev. Unless you feel like torturing yourself with understanding the other sizes and how they relate to each other, you’re almost definitely going to be ok by just relying on ISO.
Failure to follow rim width recommendations may result in poor tyre … The most common question I receive regarding mountain bike wheel sizes is: which size is best to use, and why? With this tool you may easily preview the current setup against the one that you are planning to use. Recommended not more than ±2 %. For most people, 27.5″ mountain bike wheels are the best choice. A very useful tool when searching for tires that are a different size than stock.

In terms of mountain bike wheels, 650B is a standard 27.5″ wheel, and 700C is a standard 29″ wheel.

Slide the sliders horizontally or enter the exact number by hand to see how the demo image changes. The first number, 30, represents a different measurement on tires than it does on rims. While there are variants to each size, here are the most common ISO Bead Seat Diameter measurements for mountain bike wheels: Sizes such as 700C and 650B come from an old French sizing system, where the number represents the outside diameter in millimeters. Thankfully, this is quite a straightforward line of questioning for wheel sizes, so we’ll get this out of the way early on.

We’re going to look at ISO sizing first.

Both numbers are millimeter measurements. For an 18-inch alloy wheel on a Chevrolet Traverse, one dealer quoted us a price of $371, but for an optional 20-inch wheel, the price was $569. A steel wheel weighs more than an aluminum alloy wheel, so the latter enhances performance by reducing the unsprung weight.


This guide is accurate and is updated on a daily basis.No warranties or guarantees are expressed or implied as to the accuracy of the information provided on this site.Use of this site implies your agreement to these terms. WheelPCD.co.uk - your first choice wheel information data source. Wheel fitment guide for all car models by brand and year.

That’s right, nothing at all. We strive to help you get the information you need about PCD, offset, rims and all other wheel and tire data that you need for your vehicle. Another obsolete wheel size is the English vintage 28-inch (sorry, i don’t know rim diameter in mm) , common from thr 1890s to the 1970s, exported around the world, and still made lafer (till quite recently) in countries like India also China. Well that depends on a few things. Access them anywhere. If you change to larger wheels without taking sidewall height into consideration, you not only run the risk of damaging the suspension, wheels or tires, you’ll also get incorrect speedometer readings because the wheels are turning at a different speed than before. Changes. Compare metric or inch tire specs side by side and view with our tire visualizer. The letter used to denote the width, though today, it is meaningless since you can get either 700C or 650B tires in varying degrees of narrowness. For ISO sizes (30-584), both numbers represent millimeters. The true diameter of a wheel measured tire-edge to tire-edge will differ quite a bit depending on the rim width, the tire pressure, and plenty of other factors. When you move to a larger wheel diameter (such as from 17 to 18 inches), you need new tires to match. Bigger wheels cost more money.

No warranties or guarantees are expressed or implied as to the accuracy of the information provided on this site.

What do they Mean? Then as a bonus it shows examples of your speedometer reading with the first tire, and the actual speed you're traveling if you were to install the second tire. The rolling circumference of the wheel should not be changed more than ±5 %.

The world's largest wheel fitment database. These sizes can be thought of as a sort of shorthand for decimal sizes, each with a corresponding ISO measurement. A 17-inch alloy wheel on a Camry XLE, however, was $379.

Looking to compare tire sizes before you buy? The second number, 584, is universal between tires and rims. Log In.



We strive to help you get the information you need about PCD, offset, rims and all other wheel and tire data that you need for your vehicle.

Find rim sizes PCD bolt patterns and other details. If you would like to learn how to read a tire yourself check out our how to read a tire page. This … Dimension of original tire / Dimension of new tire / 195/65-R15.

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