# Thread: Collection of true tire measurements?

1. ## Collection of true tire measurements?

There is a great list of reported weights on the different fat bike tires.
Here --> Tire Weights for Fat-Bikes | FAT-BIKE.COM

But no list of the reported true measurements?

Looking for a comprehensive list of fat tires and their true measures, particularly width when mounted up to a certain rim size.

Anyone have a list such as that they want to share? Still trying to decide on my tires

2. here is some for the 45nrth tires!
https://45nrth.com/files/chronicles/...etry_hires.jpg

3. oh sweet thank you!

4. Would also like to see some measurements in particular. Can anyone list their 1/2 length diameter from center axle/hub to outer tire mounted on rim?
For example:
Marge Lite + 4.0 Husker Du = 14"?

Think this would be very useful when looking to size up tire and rim combos and the clearance needed to fit your frame and fork.
My rear wheel 1/2 diameter:
Weinmann HL 80 Rim + 4.5 Snowshoe = 15 inches
Anyone willing to snap a quick tape and list your measurements?

5. Originally Posted by NH Mtbiker
Would also like to see some measurements in particular.
This can be worked out pretty simply mathematically. For the below equation, d=the tire width when mounted on a given rim and w=the rim width (internal, though the error is pretty small if you use external). The tire height, H, is

H=((d/2)^2-(w/2)^2)^0.5+w/2

You add the tire height to the rim radius (0.5*the BSD) to get the total radius. IE

R=BSD/2+H

The above calculations only account for the casing (ie no tread), assume that the tire is round (unlike an automobile tire) and slightly over-estimate H (we are talking a few millimeters) because there is some overlap between the tire bead and the rim. In practice, I ran this calculation's assumptions against several tires (I was calculating the width and height only knowing the bead-to-bead width and rim width), and they were within 2mm since the tread adds back some width/height that is "lost" to the bead/rim interface.

6. ## Collection of true tire measurements?

They have a tire called "Xerxes"?

7. Originally Posted by ultraspontane
They have a tire called "Xerxes"?
That name almost verges upon being "arrogant!" It would have to be a tire with attitude.

Wikipedia translates it as "ruling over heroes."

Too skinny. Must be a road tire.

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