Not your typical tires

Ignore the oval chain ring:

http://www.auctionflex.com/showlot.a...ction=&lang=En
or http://tinyurl.com/66ztbn

Look closely at the front tire at 1 & 7 o'clock.

Look _very_ closely at the rear tire at 1 & 3 o'clock.

Aren't you glad that your choices are limited to tubulars and
clinchers?

Cheers,

Carl Fogel

Carl Fogel wrote:

Ignore the oval chain ring:

http://tinyurl.com/66ztbn

Look closely at the front tire at 1 & 7 o'clock.

Look _very_ closely at the rear tire at 1 & 3 o'clock.

Aren't you glad that your choices are limited to tubulars and
clinchers?

Solid non-pneumatic rubber tires are all they had for high wheelers
and that drifted into the safety bicycle, this one apparently by Iver
Johnson. I had a later IJ that had triangular taper BB and steel
cranks. When realizing that the torsional strength of a shaft is
roughly that of the largest inscribed circular shaft. A triangle
doesn't leave much and with steel cranks had a poor retaining bolt to
boot.

Jobst Brandt

wrote in message
...
Carl Fogel wrote:

Ignore the oval chain ring:

http://tinyurl.com/66ztbn

Look closely at the front tire at 1 & 7 o'clock.

Look _very_ closely at the rear tire at 1 & 3 o'clock.

Aren't you glad that your choices are limited to tubulars and
clinchers?

Solid non-pneumatic rubber tires are all they had for high wheelers
and that drifted into the safety bicycle, this one apparently by Iver
Johnson. I had a later IJ that had triangular taper BB and steel
cranks. When realizing that the torsional strength of a shaft is
roughly that of the largest inscribed circular shaft. A triangle
doesn't leave much and with steel cranks had a poor retaining bolt to
boot.

Jobst Brandt

Is that not a valve at 7 o'clock on the front wheel?

On another note, what was the benefit of the serpentine seatpost?

On Sat, 1 Nov 2008 23:10:52 -0500, "Carl Sundquist"
wrote:


wrote in message
.. .
Carl Fogel wrote:

Ignore the oval chain ring:

http://tinyurl.com/66ztbn

Look closely at the front tire at 1 & 7 o'clock.

Look _very_ closely at the rear tire at 1 & 3 o'clock.

Aren't you glad that your choices are limited to tubulars and
clinchers?

Solid non-pneumatic rubber tires are all they had for high wheelers
and that drifted into the safety bicycle, this one apparently by Iver
Johnson. I had a later IJ that had triangular taper BB and steel
cranks. When realizing that the torsional strength of a shaft is
roughly that of the largest inscribed circular shaft. A triangle
doesn't leave much and with steel cranks had a poor retaining bolt to
boot.

Jobst Brandt

Is that not a valve at 7 o'clock on the front wheel?

On another note, what was the benefit of the serpentine seatpost?

Dear Carl,

Is that not another valve at 3 o'clock on the rear wheel?

(You have to look _very_ closely at two photos to be sure.)

The serpentine seat post wasn't a mistaken attempt at an incredibly
stiff suspension spring.

It just let you get at the bolt under the seat.

(Our great-grandfathers took a while to work out details that we take
for granted.)

Cheers,

Carl Fogel

On Nov 1, 9:15 pm, wrote:
On Sat, 1 Nov 2008 23:10:52 -0500, "Carl Sundquist"
wrote:









wrote in message
.. .
Carl Fogel wrote:

Ignore the oval chain ring:

http://tinyurl.com/66ztbn

Look closely at the front tire at 1 & 7 o'clock.

Look _very_ closely at the rear tire at 1 & 3 o'clock.

Aren't you glad that your choices are limited to tubulars and
clinchers?

Solid non-pneumatic rubber tires are all they had for high wheelers
and that drifted into the safety bicycle, this one apparently by Iver
Johnson. I had a later IJ that had triangular taper BB and steel
cranks. When realizing that the torsional strength of a shaft is
roughly that of the largest inscribed circular shaft. A triangle
doesn't leave much and with steel cranks had a poor retaining bolt to
boot.

Jobst Brandt

Is that not a valve at 7 o'clock on the front wheel?

On another note, what was the benefit of the serpentine seatpost?

Dear Carl,

Is that not another valve at 3 o'clock on the rear wheel?

(You have to look _very_ closely at two photos to be sure.)

The serpentine seat post wasn't a mistaken attempt at an incredibly
stiff suspension spring.

It just let you get at the bolt under the seat.

(Our great-grandfathers took a while to work out details that we take
for granted.)

Cheers,

Carl Fogel

I see that they had the Fart Slot long before Terry resurrected it.

On Sat, 1 Nov 2008 21:36:57 -0700 (PDT), Hank
wrote:

On Nov 1, 9:15 pm, wrote:
On Sat, 1 Nov 2008 23:10:52 -0500, "Carl Sundquist"
wrote:


wrote in message
.. .
Carl Fogel wrote:

Ignore the oval chain ring:

http://tinyurl.com/66ztbn

Look closely at the front tire at 1 & 7 o'clock.

Look _very_ closely at the rear tire at 1 & 3 o'clock.

Aren't you glad that your choices are limited to tubulars and
clinchers?

Solid non-pneumatic rubber tires are all they had for high wheelers
and that drifted into the safety bicycle, this one apparently by Iver
Johnson. I had a later IJ that had triangular taper BB and steel
cranks. When realizing that the torsional strength of a shaft is
roughly that of the largest inscribed circular shaft. A triangle
doesn't leave much and with steel cranks had a poor retaining bolt to
boot.

Jobst Brandt

Is that not a valve at 7 o'clock on the front wheel?

On another note, what was the benefit of the serpentine seatpost?

Dear Carl,

Is that not another valve at 3 o'clock on the rear wheel?

(You have to look _very_ closely at two photos to be sure.)

The serpentine seat post wasn't a mistaken attempt at an incredibly
stiff suspension spring.

It just let you get at the bolt under the seat.

(Our great-grandfathers took a while to work out details that we take
for granted.)

Cheers,

Carl Fogel

I see that they had the Fart Slot long before Terry resurrected it.

Dear Hank,

Hygenic saddles, as they were known, were popular on the even earlier
highwheelers in the 1870s.

I'm not sure if slots appeared on the even earlier velocipedes in the
1860s.

Cheers,

Carl Fogel

Carl Sundquist wrote:

Ignore the oval chain ring:

http://tinyurl.com/66ztbn

Look closely at the front tire at 1 & 7 o'clock.

Look _very_ closely at the rear tire at 1 & 3 o'clock.

Aren't you glad that your choices are limited to tubulars and
clinchers?

Solid non-pneumatic rubber tires are all they had for high wheelers
and that drifted into the safety bicycle, this one apparently by
Iver Johnson. I had a later IJ that had triangular taper BB and
steel cranks. Realizing that the torsional strength of a shaft is
roughly that of the largest inscribed circular shaft, a triangle
doesn't leave much and with steel cranks had a poor retaining bolt
to boot.

Is that not a valve at 7 o'clock on the front wheel?

I think that is where a valve wold go for a pneumatic tire, but these
may be tire anchor screws to keep the solid tire from walking around
the wheel and dismounting itself. I can't see any detail in the large
gap in these tires to see thier cross section but it seems to be
mostly solir rubber.

On another note, what was the benefit of the serpentine seatpost?

I think it is believed to be a spring similar to the belief that the
curl in fork blades are springs.

Jobst Brandt

In article ,
wrote:

I think it is believed to be a spring similar to the belief that the
curl in fork blades are springs.

There has been some published data measuring vertical flex of bicycle
fork blades under load. This flex was measured to be greater in forks
with larger offset and a lower, tighter curl at the hub end; also,
naturally enough, smaller diameter fork blades showed more flex. The
magnitude was small, maybe 1/4" at most. Whether it's *useful* is a
different story; the authors of the article believed it was but I can't
say that I was convinced. For one thing, the load was static with
weights applied to the front of the bike.

Time's a little tight this morning, I'll dig up the article and post
more specifics.

On Sun, 02 Nov 2008 11:56:11 +0000, jobst.brandt wrote:

snip for clarity
I think it is believed to be a spring similar to the belief that the
curl in fork blades are springs.

but they are jobst. the "test" you describe to try to "prove" there is no
spring uses an elastic medium and is therefore flawed. as is the case /
so/ often, not only do you not understand the fundamentals, you're
impervious to learning.

On Nov 1, 9:53*pm, wrote:
Ignore the oval chain ring:

http://www.auctionflex.com/showlot.a...4596&weventite....
orhttp://tinyurl.com/66ztbn

Another manufacturer on the compact geometry bandwagon!