Who would use a 60 tooth chainring?

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

On a tandem - 60/13 is easy to spin out on a long hill.

--
Chas. [email hidden] (Drop spamski to E-mail me)

Quoted message said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

.... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Bikes with small wheels (folding bikes, 'bents).

--
Dave
dvt at psu dot edu

Everyone confesses that exertion which brings out all the powers of body
and mind is the best thing for us; but most people do all they can to
get rid of it, and as a general rule nobody does much more than
circumstances drive them to do. -Harriet Beecher Stowe, abolitionist and
novelist (1811-1896)

Dans le message de
news:[email hidden],
[email hidden] <[email hidden]> a réfléchi, et puis a déclaré
:

Quoted message said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Only a 60?
There's a guy who rides Longchamps with a 70. Goes along at 30-35 for
hours, mostly en danseuse. He's happy, he says.
--
Sandy
--
Mobilité et stabilité ne sont pas antinomiques :
un cycliste n'est stable sur sa bicyclette
qu'en avançant.
- Chirac, J (who must have read Einstein)

* * Chas said:

On a tandem - 60/13 is easy to spin out on a long hill.

Come now, as a single rider I can spin out 60/13 on the flat!

Oh, wait, you said "60", I thought you said "50". Never mind.

Quoted message said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Tandems - although 'need' is sorta ambiguous.

Remember the famous Ron Kitching photo holding a TA cyclotouriste 26t
and a TA special 120t ring ? Ask Jose Meffert about long gearing!

As any bike shop employee will confirm, 53x11 bikes still come in
requesting bigger gearing.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Quoted message said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Time triallists.

A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
fixed you can't have a smaller sprocket, so the chainring has to be bigger.

Zog The Undeniable said:

Quoted message said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Time triallists.

A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
fixed you can't have a smaller sprocket, so the chainring has to be bigger.

Yup.

My buddy was at a major national time trial, in Valencia, CA last
year, when he spun out his 56/11 (IIRC) on the with-the-wind, slightly
downhill portion of an out-and-back TT.

He went searching for a 60t and won ... the next day ;-)

Zog The Undeniable said:

Quoted message said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Time triallists.

A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
fixed you can't have a smaller sprocket, so the chainring has to be bigger.

And some people just get on with big gears; a fellow fixed gear
pervert did 2:13 for the 50 on Sunday on 60x14, as compared with my
2:21 on 50x15. There is also a small gain in transmission efficiency
from using a big ring, maybe as much as 4W by switching from 48x12 to
60x15 for a rider making 500W

Kinky Cowboy*

*Batteries not included
May contain traces of nuts
Your milage may vary

Kinky Cowboy said:

Zog The Undeniable said:

Quoted message said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Time triallists.

A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
fixed you can't have a smaller sprocket, so the chainring has to be bigger.

And some people just get on with big gears; a fellow fixed gear
pervert did 2:13 for the 50 on Sunday on 60x14, as compared with my
2:21 on 50x15. There is also a small gain in transmission efficiency
from using a big ring, maybe as much as 4W by switching from 48x12 to
60x15 for a rider making 500W

Excellent point. I'd also be concerned about the strength of a 12T cog
when dealing with a rider that strong.

\\paul

email hidden said:

Saw this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Some riding a bike with small wheels.

--
JT
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Visit http://www.jt10000.com
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John Forrest Tomlinson said:

Quoted message said:

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Some riding a bike with small wheels.

You mean like a Shriner ?

Paul Myron Hobson said:

Kinky Cowboy said:

Zog The Undeniable said:

[email hidden] wrote:
> Saw this:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241
>
> ... and while it looks like a nice polished finish, I wonder who would
> legitimately need such a big ring?
>
Time triallists.

A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
fixed you can't have a smaller sprocket, so the chainring has to be bigger.

There is also a small gain in transmission efficiency
from using a big ring, maybe as much as 4W by switching from 48x12 to
60x15 for a rider making 500W

Excellent point. I'd also be concerned about the strength of a 12T cog
when dealing with a rider that strong.

I wouldn't worry too much; Chris Hoy used a 13 for his kilo record
attempt, and no 500W pursuiter/time triallist is going to hit the cog
harder than that. Boonen sometimes engages the 11, with it's shortened
and ramped teeth, and you don't hear of him breaking sprockets either.

Kinky Cowboy*

*Batteries not included
May contain traces of nuts
Your milage may vary

On Jul 17, 10:43 am, "[email hidden]" <[email hidden]>

Quoted message said:

Saw this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Some who ride small folding bikes with 16 or 20" wheels use chainrings
as large as 60t. Check out Dahon or Brompton for more info.

Quoted message said:

Quoted message said:

Kinky Cowboy said:

> A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
> fixed you can't have a smaller sprocket, so the chainring has to be bigger.
There is also a small gain in transmission efficiency
from using a big ring, maybe as much as 4W by switching from 48x12 to
60x15 for a rider making 500W

Quoted message said:

On Tue, 17 Jul 2007 18:26:23 -0400, Paul Myron Hobson

Quoted message said:

Excellent point. I'd also be concerned about the strength of a 12T cog
when dealing with a rider that strong.

Kinky Cowboy said:

I wouldn't worry too much; Chris Hoy used a 13 for his kilo record
attempt, and no 500W pursuiter/time triallist is going to hit the cog
harder than that. Boonen sometimes engages the 11, with it's shortened
and ramped teeth, and you don't hear of him breaking sprockets either.

Duly noted. But now I'm curious: how many miles do you think his cogs
saw? An elite time trial rider with top shelf stuff would surely have a
different experience than say a commuter putting daily miles on one.
Or am I still being paranoid?

On Jul 17, 12:43 pm, "[email hidden]" <[email hidden]>

Quoted message said:

Saw this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

This guy uses one every week on his "club ride":

http://tinyurl.com/38uysz

Quoted message said:

On Jul 17, 12:43 pm, "[email hidden]" <[email hidden]>

Quoted message said:

Saw this:http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110149744241

... and while it looks like a nice polished finish, I wonder who would
legitimately need such a big ring?

Ozark Bicycle said:

This guy uses one every week on his "club ride":

http://tinyurl.com/38uysz

Ctrl-f "bicycle" - NOT FOUND!

What does that link have to do with this? Is it the wrong TinyURL?

\\paul

Paul Myron Hobson said:

Quoted message said:

Quoted message said:

Kinky Cowboy wrote:
>> A local guy wins 10s and 25s on a 125" fixed gear. That's 60 x 13. On
>> fixed you can't have a smaller sprocket, so the chainring has to be bigger.
> There is also a small gain in transmission efficiency
> from using a big ring, maybe as much as 4W by switching from 48x12 to
> 60x15 for a rider making 500W

Quoted message said:

On Tue, 17 Jul 2007 18:26:23 -0400, Paul Myron Hobson

Quoted message said:

Excellent point. I'd also be concerned about the strength of a 12T cog
when dealing with a rider that strong.

Kinky Cowboy said:

I wouldn't worry too much; Chris Hoy used a 13 for his kilo record
attempt, and no 500W pursuiter/time triallist is going to hit the cog
harder than that. Boonen sometimes engages the 11, with it's shortened
and ramped teeth, and you don't hear of him breaking sprockets either.

Duly noted. But now I'm curious: how many miles do you think his cogs
saw? An elite time trial rider with top shelf stuff would surely have a
different experience than say a commuter putting daily miles on one.
Or am I still being paranoid?

Have you ever seen the problem you fear?

--
JT
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Visit http://www.jt10000.com
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John Forrest Tomlinson said:

Have you ever seen the problem you fear?

I've seen a photo of a small fixed cog with broken teeth, yes. I was
not however, privy to the context in which the failure occurred.

As I stated earlier, I'm open to the notion that I'm being paranoid. No
one I know rides smaller than a 14T or 13T cog, especially on the
streets. LBSs around here advise against almost universally[1].

\\paul

[1] I haven't talked to *every* employee

Paul Myron Hobson said:

John Forrest Tomlinson said:

Have you ever seen the problem you fear?

I've seen a photo of a small fixed cog with broken teeth, yes. I was
not however, privy to the context in which the failure occurred.

As I stated earlier, I'm open to the notion that I'm being paranoid. No
one I know rides smaller than a 14T or 13T cog, especially on the
streets. LBSs around here advise against almost universally[1].

\\paul

[1] I haven't talked to *every* employee

Dear Paul,

At the same mph, a smaller rear sprocket does raise chain tension, but
most of the force on any sprocket is handled by the last tooth before
the free chain run begins.

I mash happily in 53x11 at 20-25 mph for most of my daily 15-mile
ride, having switched from 52x12 years ago.

The small rear sprocket wears faster because there are fewer teeth,
the tension is higher, and the chain path is worse.

But no teeth have broken in the last 100,000 miles or so.

Even the most powerful sprinter can't tear the teeth off a bicycle
sprocket--teeth break when there's extraordinary wear, when the chain
skips wildly, or when a crash or debris smashes them.

Cheers,

Carl Fogel