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I was browsing some bicycle trials sites
and was startled by this picture of an
oddly modified rim:
http://www.trialsin.com/sell/bikes/lynx4.jpg
or
Other trials bicycles on the page where the
picture appears don't seem to use this rim:
http://www.trialsin.com/sell/bikes/bframe.htm
What (hopefully not literally) gives?
Carl Fogel
Quoted post said:Originally posted by carlfogel
I was browsing some bicycle trials sites
and was startled by this picture of an
oddly modified rim:
http://www.trialsin.com/sell/bikes/lynx4.jpg
or
http://tinyurl.com/2q9fd
Other trials bicycles on the page where the
picture appears don't seem to use this rim:
http://www.trialsin.com/sell/bikes/bframe.htm
What (hopefully not literally) gives?
Carl Fogel
Drilling holes in Alex DX32 rims?....
Interesting,,,, there are 2 different bicycles pictured on that site with the same rim configuration.
I can only guess what might pass through the thoughts of someone drilling them. The spoke bead looks nice and thick.
Then again if you shop around in "Trials Shops" you might find many brands that are pre-drilled. See:
http://www.thetrialsinshop.com/wheels.htm
carlfogel said:I was browsing some bicycle trials sites and was startled
by this picture of an oddly modified rim:
Quoted message said:Other trials bicycles on the page where the picture
appears don't seem to use this rim:What (hopefully not literally) gives?
Weight saving. The wide rim needed to support a broad tyre
at low pressure is wider (and therefore heavier) than
necessary for strength, so unwanted metal is drilled out
from between the spokes.
Here's another from the same site:
Snow and sand rims are also drilled, for the same reason.
allweathersports.comsnowcats.htmlOpen ↗
wildfirecycles.comfatbikes.htmlOpen ↗
James Thomson
"carlfogel" <[email hidden]> wrote in message
"]news:[email hidden]...
Quoted message said:I was browsing some bicycle trials sites and was startled
by this picture of an oddly modified rim:
My brother did the same on his road bike..Mavic something-or-
others, back in the day. He used those rims only in hill-
climbing events in the Alps. Actually won the Bavarian Hill
Climb Championship with them. I don't think he put huge
miles on those rims, but he never complained of any problems
with them breaking or going regularly out of true. Wouldn't
do it myself, but worked for him apparently!
Cheers,
Scott..
carlfogel said:I was browsing some bicycle trials sites and was startled
by this picture of an oddly modified rim:or
Other trials bicycles on the page where the picture
appears don't seem to use this rim:What (hopefully not literally) gives?
Another example of the fact that there's nothing new in
cycling. Mongoose BMX bikes were doing this 20 years ago.
For a long time I had the idea of making up a tube with 36
valves for use on one of these rims. That way you'd
eliminate the problem of having to actually look for the
valve, and maybe even rotate your wheel before you could
pump up your tire. I was hoping to use 18 schraders
alternting with 18 prestas so any pump would work too...but
it was too much work and I never managed to accumulate
enough screw-on valve stems...
Sheldon "No Follow Through" Brown +---------------------------------------------------
+
| Men rarely (if ever) manage to dream up a god | superior
| to themselves. Most gods have the | manners and morals
| of a spoiled child. | --Robert A. Heinlein |
+---------------------------------------------------+ Harris
Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX
617-244-1041 harriscyclery.comharriscyclery.comOpen ↗ Hard-to-find parts
shipped Worldwide captainbike.comcaptainbike.comOpen ↗
sheldonbrown.comsheldonbrown.comOpen ↗
James Thomson <[email hidden]> wrote in message
[email hidden]
Quoted message said:carlfogel said:I was browsing some bicycle trials sites and was startled
by this picture of an oddly modified rim:Quoted message said:Other trials bicycles on the page where the picture
appears don't seem to use this rim:What (hopefully not literally) gives?
Weight saving. The wide rim needed to support a broad tyre
at low pressure is wider (and therefore heavier) than
necessary for strength, so unwanted metal is drilled out
from between the spokes.
Wouldn't use of rim tape be mandatory with such rims? I
notice none was used in the first picture. (The second I'm
not so sure about).
--
A: Top-posters.
B: What is the most annoying thing on Usenet?
carlfogel said:I was browsing some bicycle trials sites and was startled
by this picture of an oddly modified rim:or
Other trials bicycles on the page where the picture
appears don't seem to use this rim:What (hopefully not literally) gives?
That's what happens when you get a guy, a drill, a rim, and
little too much free time together in the same room.
--
-John ([email hidden])
John Thompson said:On 2004-04-01, carlfogel [and some others]<usenet-
[email hidden]> wrote:
<snipping text from some very intelligent people lured into
an "amazing"
discussion>
I can't wait to see what else you guys fall for, next April
Fool's day . . .
/Robert ;-D
Sheldon Brown <[email hidden]> wrote in message news:<[email hidden]>...
Quoted message said:carlfogel said:Another example of the fact that there's nothing new in
cycling. Mongoose BMX bikes were doing this 20 years ago.For a long time I had the idea of making up a tube with 36
valves for use on one of these rims. That way you'd
eliminate the problem of having to actually look for the
valve, and maybe even rotate your wheel before you could
pump up your tire. I was hoping to use 18 schraders
alternting with 18 prestas so any pump would work
too...but it was too much work and I never managed to
accumulate enough screw-on valve stems...Sheldon "No Follow Through" Brown
I, too, remember them on Mongoose BMX bikes. IIRC, they were
drilled Araya 7X rims with a special high-strength rim
strip. The rim strip had a metallic coating that came in
several colors so the user could customize the bike without
buying new rims.
Sheldon- *I* think you should implement the Universal Rim
concept for next year's ShelBroCo product. Humankind must be
saved! (I need 'em to complete the set.)
Jeff
A drilled out rim, how interesting. Do they make drilled out
hubs, spokes, tires and tubes to go with it?
- -
"May you have the wind at your back. And a really low gear
for the hills!"
Chris Zacho ~ "Your Friendly Neighborhood Wheelman"
Chris'Z Corner geocities.comczcornerOpen ↗
"Chris Zacho "The Wheelman"" <[email hidden]> wrote in message
"]news:[email hidden]...
Quoted message said:A drilled out rim, how interesting. Do they make drilled
out hubs, spokes, tires and tubes to go with it?
Are these "drilled out rims" that much different than the
*ISM lightening* Mavic uses on its KSYRIUM SSC SL?
"Chris Zacho "The Wheelman"" <[email hidden]> wrote in message
"]news:[email hidden]...
Quoted message said:A drilled out rim, how interesting. Do they make drilled
out hubs, spokes, tires and tubes to go with it?
This is sort of the antithesis of your experience and
preferences with regard to durability Chris. Some people are
very conscious of the weight of their bike. I mean, drilling
your rims out??? There are people lurking here I'm sure who
have also drilled out their cranksets. That's some pretty
extreme and risky behaviour if you ask me! My brother
figured he'd take those chances on parts breaking in order
to have a 14lb bike. He was over
18..what can you do? I'm with you..give me good, durable
parts any day.
Cheers,
Scott..
bfd said:
"Chris Zacho "The Wheelman"" <[email hidden]> wrote
in message news:8629-406CBBAB-52@storefull-
3171.bay.webtv.net...Quoted message said:A drilled out rim, how interesting. Do they make drilled
out hubs, spokes, tires and tubes to go with it?
Are these "drilled out rims" that much different than the
*ISM lightening* Mavic uses on its KSYRIUM SSC SL?
Yes. These drilled out rims aren't patented like Mavics.
l2.espacenet.comviewerOpen ↗
&LG=en&DB=EPD or tinyurl.com3bsrsOpen ↗
"Bicycle rim and wheel with such a rim Patent Number:
EP1314579 Publication date: 2003-05-28 Inventor(s): MERCAT
JEAN-PIERRE (FR) Applicant(s): MAVIC SA (FR) Requested
Patent: EP1314579, A3
Abstract
The wheel rim (1), consisting of side walls and upper and
lower transverse walls with holes (25) at regular intervals
for spoke fastenings, has the lower transverse wall and
side walls made with a nominal thickness in the zone (26,
27) of the holes, reducing progressively in thickness
between the holes. The reduction in rim wall thickness can
be achieved by a machining operation to create a median
zone (29a) with a minimal thickness of 0.5 mm, and
transitional zones (29b, 29c) on either side of it having a
radius of curvature of 100 mm."
"Sheldon Brown" <[email hidden]> wrote in message
"]news:[email hidden]...
Quoted message said:carlfogel wrote: Another example of the fact that there's
nothing new in cycling. Mongoose BMX bikes were doing this
20 years ago.For a long time I had the idea of making up a tube with 36
valves for use on one of these rims. That way you'd
eliminate the problem of having to actually look for the
valve, and maybe even rotate your wheel before you could
pump up your tire. I was hoping to use 18 schraders
alternting with 18 prestas so any pump would work
too...but it was too much work and I never managed to
accumulate enough screw-on valve stems...
You could lighten your monospoke wheel with a bandsaw and
get rid of a lot of excess metal.
Quoted message said:I was browsing some bicycle trials sites
and was startled by this picture of an
oddly modified rim:
You'll need some big nipples for that rim.
"carlfogel" <[email hidden]> wrote in
message "]news:[email hidden]...
Quoted message said:I was browsing some bicycle trials sites and was startled
by this picture of an oddly modified rim:or
Other trials bicycles on the page where the picture
appears don't
seem
Quoted message said:to use this rim:
What (hopefully not literally) gives?
Carl Fogel
--
S. Anderson said:I mean, drilling your rims out??? There are people
lurking here I'm sure who have also drilled out their
cranksets. That's some pretty extreme and risky behaviour
if you ask me!
Cough... I've had lovely drilled out Super Record rings on
one of my bikes for about 20 years now...
--
-John ([email hidden])
Sheldon Brown said:For a long time I had the idea of making up a tube with 36
valves for use on one of these rims. That way you'd
eliminate the problem of having to actually look for the
valve, and maybe even rotate your wheel before you could
pump up your tire. I was hoping to use 18 schraders
alternting with 18 prestas so any pump would work too...
You could use 12 each of Schrader, Presta, and Woods valves.
Or 9 each of the same plus 9 quick-connect air hose chucks.
Chalo Colina
DRS said:Wouldn't use of rim tape be mandatory with such rims? I
notice none was used in the first picture. (The second I'm
not so sure about).
It depends on the tube and pressure used. Snowbike tires are
often run at 5 psi with 2-3mm thick downhill or motocross
tubes, in which case rim tape might well be unnecessary. Of
course the rim holes would have to be well chamfered lest
they chafe the tube.
Chalo Colina
"John Thompson" <[email hidden]> wrote in message
"]news:[email hidden]...
Quoted message said:On 2004-04-02, S. Anderson
<[email hidden]> wrote: Cough... I've had
lovely drilled out Super Record rings on one of my bikes
for about 20 years now...
Oh the rings are probably fine, no stress there. My brother
drilled the arms out! Like, 4 lovely 1/2" holes from top to
bottom. Actually, they never did break, but I dunno...seems
risky to me!! ;-)
Cheers,
Scott..
(Chalo) said:Sheldon Brown said:For a long time I had the idea of making up a tube with
36 valves for use on one of these rims. That way you'd
eliminate the problem of having to actually look for the
valve, and maybe even rotate your wheel before you could
pump up your tire. I was hoping to use 18 schraders
alternting with 18 prestas so any pump would work too...You could use 12 each of Schrader, Presta, and Woods
valves. Or 9 each of the same plus 9 quick-connect air
hose chucks.
QC chucks. Best idea. Ever. Why not?
And now for some complete sentences...
Why don't we have a nice valve that offers secure closure,
secure attachment, and quick release without pressure loss?
Something like an air hose QC (but rather smaller and
lighter) would be great!
--
Rick Onanian
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