Is anyone using 29 inch tires?

Sarah! Great pictures- Lewis will appreciate them. They would make a fine dowery, if you weren’t already past that point. :wink:

Christopher

Re: Is anyone using 29 inch tires?

On Tue, 23 Apr 2002 22:55:30 GMT,
klaasbil_remove_the_spamkiller_@xs4all.nl (Klaas Bil) wrote:

>700c sounds
>more like a code to me. Or maybe it would be millimeters diameter?
>(However, 28" equals about 711 mm not 700.)

Oops, I should have said 29" equals about 737 mm, and that is quite
far off the 700 mark. So, who can enlighten me what 700c stands for
(if anything)?

Klaas Bil

“To trigger/fool/saturate/overload Echelon, the following has been picked automagically from a database:”
“22 SAS, klm, 32”

Re: Is anyone using 29 inch tires?

In article <3cc71a01.1061137@newszilla.xs4all.nl>,
Klaas Bil <klaasbil_remove_the_spamkiller_@xs4all.nl> wrote:
)On Tue, 23 Apr 2002 22:55:30 GMT,
)klaasbil_remove_the_spamkiller_@xs4all.nl (Klaas Bil) wrote:
)
)
)>700c sounds
)>more like a code to me. Or maybe it would be millimeters diameter?
)>(However, 28" equals about 711 mm not 700.)
)
)Oops, I should have said 29" equals about 737 mm, and that is quite
)far off the 700 mark. So, who can enlighten me what 700c stands for
)(if anything)?

<http://www.sheldonbrown.com/tire-sizing.html>

It doesn’t really stand for anything; it’s a(n) historical accident.
-Tom

A 700C rim is actually about 622mm in diameter at the bead seating depth, about 24.5 inches. TIRE diameter is actually at the 700C mark, or about 27.5 inches, hence the 27/28 inch confusion.
The 29 inch tires are for 700C rims, but are so huge, fat, tall, knobby, that the tire diameter measures out to 29 inches.
Example:
The Nanoraptor is 52mm tall according to wtb.com, so 622 + (2x52) = 726mm = 28.6 inches.

RE: Is anyone using 29 inch tires?

> Oops, I should have said 29" equals about 737 mm, and that is quite
> far off the 700 mark. So, who can enlighten me what 700c stands for
> (if anything)?

On this Web site:
http://www.co-motion.com/26or700c.html
I found this:

“First, it helps to understand the history of tire-sizing
nomenclature. Both designations, 26” and 700C indicate tire
diameters that are only nominally related to the actual
diameters commonly used. Most of the 700C tires in use today
on road bikes are about 675 to 680mm in actual outside diameter,
(not 700). The rim size is the same as that used on zillions of
working-class bikes around the world, although their tires
measure around 710mm. The 26" size that most of us are familiar
with is descended from American balloon-tired bikes, which had
tires about 1.75" wide and actually measured at about 26". When
narrower tires are used, the overall diameter invariably changes
too, as the tire assumes a relatively round cross-section no
matter what kind of casing is used. Amazingly, on a 26" wheel,
the small 1" or 1.25" tires can result in a diameter of little
more than 610mm, (24")."

This does not explain the use of the letter “C” to denote “approximate
number of millimeters”.

I think what it all boils down to is the fact that tire manufacturers make
millions of tires, so the naming conventions will not change easily. Also,
that rim size and tire size are not absolutes; that even within a given
“type” (such as 26") there is a very wide range of possible actual sizes.

Remember also that rim width affects tire width. A tire will have a
manufacturer’s size on it (700C x 52), but you only get 52mm width if you’re
on the rim intended to go with the tire. Wide variations in rim width can
also make small variations in tire diameter… :slight_smile:

So if we want to start a new category of racing for “large, commonly
available wheels”, what should we call it and what should the limit
dimension (diameter) be?

Enjoy,
John Foss, the Uni-Cyclone
jfoss@unicycling.com

“I am never riding the wrong way on a busy street again, esp. when on the
phone.” - David Stone, on survival

Re: Is anyone using 29 inch tires?

rhysling <rhysling.3mn0n@timelimit.unicyclist.com> wrote:

> Sarah! Great pictures- Lewis will appreciate them. They would make
> a fine dowery, if you weren’t already past that point. :wink:

Well past that point, when Paul and I married five and a half years ago he
had two unicycles and I had one unicycle and a uni-bike trick cycle
thing. The trick cycle and the giraffe were sold fairly soon on as we had
very little space in those days and had aquired a pair of Munis… the
rest, well they just came along one at a time and our family of unicycles
has kept on growing. I will admit I have been known to refer to a new uni
as our new baby :-).

sarah


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