Re: Who would use a 60 tooth chainring?

On Wed, 18 Jul 2007 18:24:14 -0400, Paul Myron Hobson
<phobson@xxxxxxxxxx> wrote:

John Forrest Tomlinson wrote:
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
.

Relevant Pages

  • Re: Chain skipping on large chain ring.
    ... Then we can see the wear on all ... >>> the teeth much more clearly. ... >>> do ride with even a slightly worn chain, the wear is worst at the ... >>> points where the chain gets the highest tension. ...
    (rec.bicycles.tech)
  • Re: Does the number of teeth of a chainring need to be prime?
    ... teeth) is a prime number and I have been asking myself why. ... Imagine you select a chain link at random and a chainring tooth at ... chainring are relative prime. ...
    (rec.bicycles.tech)
  • Re: Does the number of teeth of a chainring need to be prime?
    ... teeth) is a prime number and I have been asking myself why. ... Imagine you select a chain link at random and a chainring tooth at ... chainring are relative prime. ...
    (rec.bicycles.tech)
  • Re: Crap Shimano gears!!
    ... the sprockets and teeth are specially designed to allow the chain to ... if you go into a bike ... and chain alone until they start slipping then replace everything all ...
    (rec.bicycles.tech)
  • Re: Who would use a 60 tooth chainring?
    ... and the chain path is worse. ... But no teeth have broken in the last 100,000 miles or so. ... Damaged teeth on fixed systems, both front and rear, usually follow from wildly erratic chainline or excessive chain tension, both anomalies. ...
    (rec.bicycles.tech)