What does RO mean on sand tires?

[Lowflyin]

I always see roll out advertised when tires are for sale but not exactly sure what it is. I have an idea but figured I'd ask to clarify it.

 

 

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[J-Madd]

Roll Out (circumference)

[LilJockey481]

Roll Out (circumference)

Yes as j-MADD it is the circumference usually measured in inches an easy way to check is stretch out a tape measure on the floor and see how fare one complete revolution of the tire is. Can also just wrap the tape measure around the tire

[Lowflyin]

Is it used to measure height of paddles or what?

 

 

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[brettjsand2000]

no....measures the total distance around the tire...doesnt have nothing to do with paddle height.  Basically the more power you have the more roll out you will need.

[possum]

rollout is to know true height of tire. which effects gearing. example 72" ro is approx 22" tall. 75" ro is approx 23" tall. both 22x11x8..!

[fappy'97]

rollout is to know true height of tire. which effects gearing. example 72" ro is approx 22" tall. 75" ro is approx 23" tall. both 22x11x8..!

For some reason, this makes no sense to me what you stated. It seems like you're saying every 'height' there is a specific RO, yet you state they can be the same?

 

My view, is you can have a 22" tire with 10"+ differences in RO, depending on paddle count and paddle size.

 

 

[possum]

well thats just the way i use rollout to determine tire height. because not every 22x11x8 is 22" tall. depending on rim width and carcas brand.

[possum]

no not every height there is an exact RO. that was just an example if paddle count was the same.

[brettjsand2000]

Correct, depending on the wheel you have the tire on, could change ro.

[brettjsand2000]

Nice RO gauge

 

[BigRed350x]

In general, a wider rim will hold the tire more "square" shaped and won't let the tire balloon out.  So you can have a 22x11x8 tire on an 8x8 rim and it will look like the tires on my drag bike in my signature.  Then you can have a 22x11x8 tire on an 8x10 rim and it will look more like a 20" tire, wide and flat across the top instead of a rounded balloon shape.  So you can't compare tire size to roll-out.  I have 68 RO 22" tires and 73 RO 22" tires.  Wrapping the tape measure isn't an accurate roll-out either.  You are getting the RO measurement of the outside edge of the paddles, not the tire carcass itself.