HDTenEightyP/NetNews huggingface dataset:
From: vinson@shiva.seas.upenn.edu (Jack Vinson)
Newsgroups: rec.bicycles.tech
Subject: MTB:  How to not trash the rear derailleur?
Summary: does anyone know
Date: 1 Sep 92 14:38:00 GMT
Organization: The University of Pennsylvania


I seem to be pretty good a trashing rear derailleurs on my MTB.  As of
tomorrow I will have a third since I got my spiffy purple puddle eater back
in November.  Before that I had a cheapo "mtb" with a 200GS drivetrain that
is STILL working okay as my commuting and "road" bike.

It is entirely possible that I am riding more aggressively on my current
mtb because it's built for it.  I guess I am just surprised at how much
money I am continually sinking into this thing.  I've also gone through
several freewheels - by the way I am running Shimano derailleurs with a
Suntour freewheel, but this may change when I replace my rear wheel.

So, does anyone have experience in NOT trashing derailleurs?

Jack Vinson			vinson@shiva.seas.upenn.edu     
When the justice system is for "just us" we are in trouble!
From: dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes)
Newsgroups: rec.bicycles.tech
Subject: Re: creakondale
Date: 30 Aug 92 03:16:22 GMT
Reply-To: dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes)
Organization: University of Trondheim, NORWAY

Thus spoke the keyboard of andrews@hpopd.pwd.hp.com (andrew smedley):
> I have also had problems with my 'dale. The squeaking turned out to be
> a loose headset although when riding the bike it seemed almost impossible
> to determine exactly where the noise was coming from. The noise only
> occurred when pushing hard on the pedals. So try tightening that headset!

I got three bikes and all of them squeak.

My racing bike (not a 'dale) got the squeak in the Look Arc pedales. Some
oil fix that problem. My commuting bike (a MTB and not a 'dale) got an
annoying noice in the saddle or the saddle pin. Have not doen anything
with it yet.

My mountain bike (a 'dale) got the squeak in the BB or somewhere around
the BB. I poured some medium light oil down the seat tube. The next time
I was out riding the noice have changed from a only_at_steep_hill squeak
to a low as_long_as_you_pedal squeaky a bit hard sound.

Perhaps I should try to have some more oil in the seat tube and the noice
will be history?

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+
* I went back to my mother,           * Joern Yngve Dahl-Stamnes           *
* I said, "I'm crazy ma, help me!"    * University of Trondheim            *
* She said, "I know how it feels son, * The Norwegian Institute of Tech.   *
* 'cause it runs in the family."      * Division of Physical Electronics   *
*       - The Who, Quadrophenia       * e-mail: dahls@fhydra.dnet.unit.no  *
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+
Xref: sparky rec.bicycles.tech:39 rec.bicycles:21763
Newsgroups: rec.bicycles.tech,rec.bicycles
Subject: Re: Braze-on Question
From: Eric Schweitzer <ERSHC@CUNYVM.BITNET>
Date: Wednesday, 26 Aug 1992 00:14:57 EDT
Organization: City University of New York/ University Computer Center

In article <1992Aug25.234413.28517@hpcvusn.cv.hp.com>, craig@hpcvusn.cv.hp.com
(Craig Durland) says:
>: Could you netters comment on the difficulty/expense/caveats of having
>: someone add water bottle cage braze-ons to my Fuji chrome-moly frame?
>
><good advice deleted>
>
>Also, you might try to find some Riv-Nuts (Third Hand carries them).

I have both brazed in water bottle bosses and poped in riv-nuts
and find the brazing more satisfactory. Although you do lose paint,
the brazed in bosses won't turn. The riv-nuts can, making it almost
impossible to remove the cage. (They don't always turn, but if they
start they won't stop).

Both jobs take about the same time, assuming it takes one as long
to find one's pop rivet tool as it takes one to set up one's torches.
Newsgroups: rec.bicycles.tech
From: mjohnsto@jenny.shearson.com (Mike Johnston)
Subject: Re: I Can't See
Organization: Lehman Brothers
Date: Thu, 27 Aug 1992 21:35:11 GMT

In article <1992Aug27.162008.14837@athena.mit.edu> aviator@athena.mit.edu (Joakim Karlsson) writes:
   We've had some of the hottest muggiest weather ever here in 
   the Boston area lately, so that may be a contributing factor.

Wah, wah, wah..... I'm getting a little sick of people complaining about 
how *tough* they have it when they ride. Sheesh! When *I* ride:

	- The bugs are so thick I have to brush my teeth when I get home.
	  
	- The humidity I so great that, at my naturally high riding velocity,
	  I leave a wake just like F-14's do in movies.

	- The roads are so hot that, if I stop for more than 30 seconds, I 
	  leave black splotches of melted tire rubber.

	- The Car Nazi's are so prevalent, I scream myself hoarse while
 	  reverently bellowing The Harvey Bark(*).

So don't tell me you have it tough. Things can get much worse.

MJ

(*) The Harvey Bark is Copyright 1991 by Dave Harvey. 
    Used without permission


--
Michael R. Johnston/System Administrator                mjohnsto@shearson.com  
  =-=-=  The official .signature of the 1992 Barcelona Olympics. =-=-=

Newsgroups: rec.bicycles.tech
From: harry@cv.hp.com (Harry Phinney)
Subject: Re: top five innovations
Organization: Hewlett-Packard Company, Corvallis, Oregon USA
X-Newsreader: Tin 1.1 PL4
Date: Thu, 27 Aug 1992 00:33:51 GMT

pfaffman@pilot.njin.net (Jay Pfaffman) writes:
: When I bought my bike (5 Years ago?) Biopace was
: ubiquitous, now it seems to be non-existant.  What's the deal?

I'll offer my opinion, and I stress that this is only my opinion.  At
the time, Shimano was in heavy competition with Suntour for market share
in the OEM market.  They developed Biopace as a differentiator - a
feature to which a sales person could point as an advantage on a Shimano
equipped bike.  It worked spectacularly.  Bike shops and magazines are
generally happy to push new "innovative" products because they expect
these products to increase sales.  People will buy new chainrings from
the shops, and it gives magazines something to write about that they
haven't written about in over 10 years.  This makes the topic appear new
to 90%+ of their readership.  In a short time, Shimano became the
dominant OEM supplier.  There were most surely many other factors in
this development, but Biopace played a very significant role.

: I remember reading about elliptical chainrings 15 years ago.  The
: article was very positive & the example shown was drasticly
: elliptical, much more so than my bio-pace.  

I believe magazines will always tend to promote unusual things
regardless of their value.  Certainly, if something is _really_ bad,
they might say so, but if something simply offers no real advantage,
they will often dream up some reason for the reader to at least be
interested enough to read about it.  It has to be tough to put together
a cycling magazine without rehashing the same topics every year (or even
every issue).  I believe you can find a discussion of elliptical
chainrings in Archibald Sharpe's book on bicycles and tricycles.  This
book was written in the 1800s.

: Allegedly they were "computer designed" & had stuff to back up their
: benefits, but I guess there have been new studies. . .

Maybe their research was genuine (and poor), or maybe it was additional
marketing hype generated after the product was developed, I don't know.
Realize, these are the same researchers who published research showing a
significant energy savings from indexed shifting.  This study involved
having the subjects ride rollers while shifting every 5 to 10 seconds.
The rider's power output and VO2 were measured while using both indexed
and non-indexed shifters.  Through this, they deduced that indexed
shifting would save a rider a significant amount of energy while riding.

Harry Phinney   harry@hp-pcd.cv.hp.com
Newsgroups: rec.bicycles.tech
From: blagdon@engin.umich.edu (Kenneth James Clark )
Subject: Re: top five innovations
Date: Fri, 28 Aug 92 15:24:23 EDT
Organization: University of Michigan Engineering, Ann Arbor

OK, my turn, I guess.  Can anyone out there give a good description of the
proposed benefits of 'biopace'?  I see lots of people slamming them, but
I have to admit that I've been riding elliptical cranks for about five
years now, at cadences from 70 to 120 (average around 95), with no knee
problems and no difficulty.  No, I'm not guessing at my cadences.  Yes, I
do actually ride my bike (4 mi round-trip to work each day, shopping trips,
centuries, two week+ trips two summers ago - 500 & 700 mi fully loaded).

My limited study of engineering would suggest that an elliptical chainring
could indeed have advantages.  I don't think anyone would try to say that
we humans put out even power throughout a revolution.  So is the 'uneven'
cadence the proposed problem?  Is that it?

Ken
Newsgroups: rec.bicycles.tech
From: CMSC28@maccvm.corp.mot.com (Mark Hickey)
Subject: Re: Biopace Chainrings
Organization: Motorola
Date: 1 Sep 1992 15:20:30 CDT

------------------------- Original Article -------------------------
I'm not an experienced enough rider to be able to comment on the
differences between Biopace and round rings. The most annoying
thing about them from my point of view is that they are available
in a very limited number of sizes. I have only been able to find

So, Biopace is very much alive in certain parts of the market.


Trevor Warwick

Trevor,
I suspect that if many cyclist in the UK are actually looking for
BIOPACE chainrings, there is a small fortune to be made selling
slightly used rings from the US, where there is a huge market for
aftermarket ROUND rings.  Too bad I didn't read your letter sooner,
I'm going to London tomorrow, and could have rounded up (play on
words, sorry) a pile of the egg shaped things!

Mark (spinner) Hickey
From: johnn@hpfcso.FC.HP.COM (John Nicol)
Date: Thu, 3 Sep 1992 20:03:40 GMT
Subject: Re: Mispostings
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: rec.bicycles.tech

In rec.bicycles.tech, les@SAIL.Stanford.EDU (Les Earnest) writes:

> In any case, it is also clear that many people do not bother reading
> the charters of newsgroups they join and instead just read them a bit
      ^^^^^^^^
	Am I missing something?  What's a "charter" and where do I find it?

It appears to me that the bicycles group split but I do not know what 
all the groups are.  As only an occasional reader how am I to keep up
on such things?
Newsgroups: rec.bicycles.tech
From: drela@athena.mit.edu (Mark Drela)
Subject: Re: Difference between Shimano RX100 and 105 components
Organization: Massachusetts Institute of Technology
Date: Wed, 2 Sep 1992 00:26:20 GMT

In article <1992Sep1.155632.10168@csc.ti.com>, ericr@dadd.ti.com (Eric Rullan) writes:
!>   ...
|> However, nobody has been able to tell me exactly what the difference is 
|> between the RX100 and the 105's.  
|> 
|> Can anyone explain the differences or can someone provide a number for 
|> Shimano so that I might try calling them directly??

A salesman at Belmont WheelWorks said that RX100 and 105 are identical
except for the paint.  I would tend to believe him since this revelation
ran counter to his sales interest.

                   Mark Drela
             _______________________________
    o/LO  .' 
     O  .'  Gravity-Powered Technologies Lab 
      .'  MIT Aero-Astro Department  33-214
     '
Xref: sparky rec.bicycles.tech:226 rec.bicycles:22107 rec.bicycles.misc:258
From: hamton@byron.u.washington.edu (MrEuStress)
Newsgroups: rec.bicycles.tech,rec.bicycles,rec.bicycles.misc
Subject: Internet  Fastened to the Bike
Date: 3 Sep 92 00:15:50 GMT
Article-I.D.: u.1992Sep3.001550.18871
Organization: University of Washington


  What is the name of the Book (and author)
  that talks about having an Internet
  terminal fastened to his bike?

  Please e-mail me.
From: truesdel@ics.uci.edu (R. Scott Truesdell)
Subject: Re: GRIPSHIFTERS?????
Newsgroups: rec.bicycles.tech
Organization: University of California, Irvine
Date: 28 Aug 92 01:04:53 GMT
Followup-To: rec.bicycles.tech

In article <1992Aug27.144006.24768@leland.Stanford.EDU>,
blokhead@leland.Stanford.EDU (Darren Pakying Lum) wrote:
>
> I am looking to buy a Univega mountain bike with gripshifters
> today.  This is the first time I've ever seen or heard of the
> gripshifters.

I'm assuming you are referring to GripShift(tm).

They work. Some racers even use them. However, no racers use Univega.
Unless the price is fantastic or there is some feature you can't live
without, the Univegas are predominantly overweight and not known for their
great handling or feel. They are sturdy and thus make good rentals.

  --scott
Newsgroups: rec.bicycles.tech
From: scherrer@ifi.unizh.ch (Stefan Scherrer)
Subject: Locking Devices
Reply-To: scherrer@ifi.unizh.ch
Organization: University of Zurich, Department of Computer Science
Date: Tue, 1 Sep 1992 06:31:30 GMT

Hi there,

excuse me if this is a faq, but I suffer a problem that needs a definitive solution. Having a fairly expensive ATB, I would like to protect it from thieves. As an overall solution, a Kryponite locker does a rather good job. Nevertheless, almost every month, different parts get stolen from my bike (bar ends, pedals, etc.). The idea that came up immediately is to use an electronic device which starts making terrible noise as soon as somebody puts his/her dirty fingers on the bike.

I propose to start a discussion on the usefulness of such systems (if there exist any). 
Please mail me any vendor names and experiences, I'll summarize.

Cheers, Stefan.


---
Stefan Scherrer                         Phone   : +41 1 257 45 76 
Institut fuer Informatik                Fax     : +41 1 363 00 35
Universitaet Zuerich                    Telex   : 817 251 unii ch 
Winterthurerstrasse 190                 EAN     : scherrer@ifi.unizh.ch
CH-8057 Zuerich, Switzerland 
---

Newsgroups: rec.bicycles.tech
From: CMSC28@maccvm.corp.mot.com (Mark Hickey)
Subject: Re: top five innovations
Organization: Motorola
Date: 28 Aug 1992 16:06:43 CDT

------------------------- Original Article -------------------------
Newsgroups: rec.bicycles.tech
From: blagdon@engin.umich.edu (Kenneth James Clark )
Subject: Re: top five innovations
Date: Fri, 28 Aug 92 15:24:23 EDT
Organization: University of Michigan Engineering, Ann Arbor

OK, my turn, I guess.  Can anyone out there give a good description of the
proposed benefits of 'biopace'?  I see lots of people slamming them, but
I have to admit that I've been riding elliptical cranks for about five
years now, at cadences from 70 to 120 (average around 95), with no knee
problems and no difficulty.  No, I'm not guessing at my cadences.  Yes, I
do actually ride my bike (4 mi round-trip to work each day, shopping trips,
centuries, two week+ trips two summers ago - 500 & 700 mi fully loaded).

My limited study of engineering would suggest that an elliptical chainring
could indeed have advantages.  I don't think anyone would try to say that
we humans put out even power throughout a revolution.  So is the 'uneven'
cadence the proposed problem?  Is that it?

Ken

As I understand the theory behind Biopace, the strange shape helps
even out the (neophite) cyclist's power output throughout the power
cycle.  However, an experienced cyclist with thousands of miles in
his legs will have developed a smooth "spin", negating the need for
non-round rings.  Other than low-RPM, high torque applications,
you're much better off learning to spin than using an egg-shaped
crutch.
Mark (spinner) Hickey
From: BRANDT_JOBST/HP1900_01@HPLOMG.HPL.HP.COM
Newsgroups: rec.bicycles
Subject: Re: Dual pivot calipers (?)
Date: 25 Aug 92 15:04:33 GMT

Robert Lewis writes:

Quoting from Bicycling:

> 1989, and Shimano launches a dual-pivot brake in its 105 groupset
> which it calls the Super SLR system.  The brake caliper is very similar
> in design to the GB Synchron [a dual pivot design introduced in 1962].
> But Shimano combines this design with a rather special brake lever to
> provide a two phase action.
>
> The first phase brings the brake blocks close to the rim quickly whilst
> the second provides increased leverage and hence greater greater braking
> power.  The increased travel of the brake lever due to the increased
> leverage of the caliper is taken care of by the first phase.  And, as
> Shimano says, increased braking power is available without an overall
> increase in lever travel.

Leave it up to our eminent bicycle rag to not investigate this with their
own measurements and research but to merely add "groupset" to the discussion.
I prefer "groupset assembly", it's more complete than just plain "group".
It should not go unmentioned that the two stage brake has always been the
quest of all brake designers.  If the mechanism described in the above
paragraph were possible we could get rid of most power brakes in cars.
I believe that if you think about it you will realize the concept is an
illusion.  Where is the crossover point and what happens if it shifts ever
so slightly?

But disirregardless, hopefully this is not beyond the abilities of linear
measurement.  I rushed right down to my local bike shop that has bikes with
just about every brake imaginable.  Measuring the dual pivot Shimano brake,
I was able to determine that it has a 4:1 hand lever ratio and because the
caliper has a 1:1 ratio, an overall ratio of hand lever travel to pad
spacing change of 4:1.  Nothing has changed although Ed Burke PhD wrote in
Bicycling "How to Grow Gold Medals" with technological advances in super
bikes and super riders.  Hype is cheap and Bicycling, not wanting to make
waves passes it along to the reader unfiltered in bulk quantities.

Of course many people have the same complaint of other specialty magazines
like Audio or Photography in which products are evaluated.  It gets down to
the implied infallibility of the printed word.  I read it in a magazine is
not a good reason to believe in something unless the magazine has a strong
reputation for accuracy.  Bicycling does not.  Bike World (later absorbed
by Bicycling) also reported that Fiamme had a new alloy, Ergal, that was
black through and through.  This was a mistake in translation of black
anodizing.  That there are no metals that are not silver or gold was
apparently out of the editor's research capabilities.  Just a phone call
to a reputable scientist would have sufficed.

The same goes for bicycle magazines inability to quantify anything on a
bicycle because measurement might get them out of the fuzzy terms like
responsive, forgiving, quick, and the like.

Ride bike!

jobst_brandt@hplabs.hp.com
Newsgroups: rec.bicycles
From: dowdell@unixg.ubc.ca (David J. Dowdell)
Subject: Re: Gas subsidies and taxes (was Re: Bicycle Paths
Organization: University of British Columbia, Vancouver, B.C., Canada
Date: Wed, 26 Aug 1992 17:59:20 GMT

In article <k6an#=_.tomk@netcom.com> tomk@netcom.com (Thomas H. Kunich) writes:
>
>Why should I, who have no children, be forced to pay for education. Why
>should my taxes be used to build schools? Why can't those with lots
>of children pay the largest percentage of school taxes?

Think of it a paying retrospectively for your own education!  If you look at
it this way, each one of us should pay the same for our basic (elementary,
high school) education.

>How about a tax on birth certificates? We could tax anyone that has children
>because it is children that use the schools. Children also grow up to
>be adults that have even more children and the population boom continues.
>
>Children are the majority users of most city parks, city zoos, city
>museums and city schools. Why should my taxes continue to pay for
>other people's sexual freedom to clog the globe with excess population?

I don't know what Thomas has against children.  Children are cute, 
sometimes:-))  Children ride bicycles!!  

To get back on topic, gas taxes should not be
collected to fund neighbourhood streets, public parks, bicycle paths etc..
Gas taxes should only be directed at the construction and maintenance of 
highways.  Municipal taxes should pay for the neighbourhood streets where most
children play (cycle), and also partly for city streets that commuters use.  
In this way, the cost of roads for cyclists are covered.  The tax sytem in 
Canada is already set up to operate this way.  Although I don't know where 
Thomas is posting from, I would expect that his taxes are collected in a 
similar manner.

Although I feel that fuel taxes are the fairest way to pay for our highways,
the _levels_ of taxation may be completely out of wack, and I agree that they
seem to subsidize the automobile unfairly.
_____
David Dowdell
dowdell@unixg.ubc.ca
From: iba@kronos.arc.nasa.gov (Wayne Iba)
Subject: Question on DIY frame painting
Organization: NASA/ARC Information Sciences Division
Date: Mon, 31 Aug 1992 20:17:45 GMT


[heh, am I the first to cross post to three bicycle groups?  So sue me.]

I've followed previous discussions of frame painting (and the FAQ
material) but have a specific question not covered before.

I am painting a frame with spray cans.  I do not have a compressor or
a paint gun.  What can I do to get a clear coat over everything?  I
cannot seem to find enamel clear coat anywhere.  Have they stopped
making it?  Is there a suitable alternative for someone without a
paint gun and compressor?  If so, where can I get it?  I have seen
water-based acrylic clear coat; am I justifiably doubtful about the
usefulness of such a poduct?

Newsgroups: rec.bicycles
From: Robert Drongowski <Robert.Drongowski@cc.umich.edu>
Subject: Cleaning MTB's
Date: Wed, 02 Sep 92 15:17:39 EDT
Organization: Pediatric Surgery, U of Michigan
X-Useragent: Nuntius v1.1b2


	My family recently purchased moutain bikes, and in regards to cleaning
them the dealer suggested occasionally taking them to a do-it-yourself
car wash, using their high pressure spraying equipment followed by lots
of SILICONE SPRAY to prevent rusting of key elements:  gears etc.
	Is the use of silicone spray a good method of preventing rust damage??
	I just walk around campus and look at old bikes and note where they rust
and apply the silicone especially to these areas.  Does anyone know if
this works??  Are there better methods to clean and prevent rusting
(other than not riding outside :-) )??
Bob Drongowski
Ann Arbor, MI
Newsgroups: rec.bicycles,rec.bicycles.misc
From: tims@cci632.cci.com (Tim Sullivan)
Subject: Re: Gas subsidies and taxes (was Re: Bicyc
Reply-To: tims@cci.com (Tim Sullivan)
Organization: Computer Consoles, Inc.  Rochester, NY
Date: Thu, 27 Aug 1992 14:51:55 GMT


melvin@math.psu.edu wrote this about Gas subsidies and taxes:
>While cursing the traffic jam caused by the toll booth on the Maine Turnpike,
>I thought of how neat it would be to require cars to have large bar codes on
>the door so that tolls could be automatically charged to your MAC card without
>slowing down.  With this system, all roads could be made into toll
>roads and car drivers could begin to pay for the immense physical and
>social destruction they cause.
	
	In todays New York Times (8/27/92) there is an article decribing how
	Motorola and Amtech Corp. are teaming up to create a radio controlled
	toll collection system that will charge tolls against a credit or debit
	card.


--------------------------------------------------------------------------------
Tim Sullivan
tims@cci.com
From: TOM@SLACVM.SLAC.STANFORD.EDU
Newsgroups: rec.bicycles
Subject: Re: Campy dt shifter problem
Date: 31 Aug 92 20:17:32 GMT
Organization: Stanford Linear Accelerator Center

The problem I had with my Campy Shifters slipping, was that I made the misake
of greasing the nylon. Just leave them dry, if you have any oil, WD-40 or
grease, clean them off with alcohol and reassemble.
                                                     Tom
Newsgroups: rec.bicycles