Tire and Rim size question??


2 replies to this topic
  • Rethy

Posted January 07, 2007 - 10:29 AM

#1

The rim on my xr has DID 215 X 305 DOT stamped in it. When sizing for proper tire this is a 3" wide rim not a 2.15 inch wide right? 2.15 sounds too narrow to me. Most tires for our bikes require a 2.5 inch wide rim. That is why I am thinking the 305 refers to width. Anyone know the meanings of these numbers?--------------Thanks, Rethy

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  • cleonard

Posted January 07, 2007 - 11:01 AM

#2

The rim on my xr has DID 215 X 305 DOT stamped in it. When sizing for proper tire this is a 3" wide rim not a 2.15 inch wide right? 2.15 sounds too narrow to me. Most tires for our bikes require a 2.5 inch wide rim. That is why I am thinking the 305 refers to width. Anyone know the meanings of these numbers?--------------Thanks, Rethy


No it is just like what you are seeing. I usually use a tire specified for a 2.50 inch rim on my 2.15 inch rims. As you go further oversize the tire gets pinched by the rim and the tread portion gets curved more. What happens is that the side knobs get bent over no far that they never hit the dirt. The wear all happens on just the center knobs. This is even more the case on the pavement.

I'd say that tires for 2.50 inch rims are good to use. Tires for 3.00 inch rims may be OK, but expect them to wear pretty quick as only the center knobs will get much use. I wouldn't use tires for 3.50 inch rims on a 2.15 inch rim. They just have to bend too far to reach the small rim. On the pavement a tire for a 2.5 inch rim will have a bigger contact patch than the tire for a 3.50 rim if mounted on a 2.15 rim. As long as things don't rub, I don't think it's dangerous or anything, it's just that the extra $$$ for the bigger tire is being wasted.

Most motorcyclists, street and dirt, think a bigger tire is always better. This is not always the case. They do look cooler though.

  • bcone

Posted January 07, 2007 - 06:06 PM

#3

The 2.15 refers to the rim's width at the base of the inside of the rim (where the tire will seat). The 3.05 refers to the width of the rim at the outer edge.
I'm guessing that when you're ordering a new rim the measurement your looking at is the inside measure.

I went to a 2.5" 17" rim on the back so I can run my street and dirt tire (can't quite afford a new set of wheels just now). I went with a 2.5 instead of a 3.5 because it's easier to get the tire on and off.





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