Robert Burney

Most new rims now have a wear indicator built into the rim. Mavic uses a
line that is scored all the way around the rim; Zipp uses small red dots
recessed into the rim. When these indicators become flush with the rim, it
is time to replace the rim.
Ray Thomas wrote an article for Oregon Cycling about this subject about 2
years ago. He also had a rim explode because the brakes had worn the rim
surface down over several years. Eventually the rim becomes too thin to
support the pressure from the tire and the rim disintegrates.
Robert

Robert Burney, JD
President

RE Burney & Associates, Inc.
8285 SW Nimbus Ave., Suite 124
Beaverton, OR 97008

Brokerage of Life Insurance, Annuities,
Long Term Care and Disability Insurance.

Office: 503-608-7813
Cell: 503-702-0099
EFax: 503-210-1595
Email: robert@reburney.com
-----Original Message-----
From: obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org] On
Behalf Of Vicki Schroeder
Sent: Tuesday, July 01, 2008 6:31 PM
To: obra@list.obra.org
Subject: Re: [OBRA Chat] Bike part longevity?

I second replacing/checking your rims especially if they have a lot of
winter miles on them. I had an old Mavic rear rim on my winter bike fail -
the side wall/lip of the rim that holds the tire on collapsed and sheared
off. Made a heck of a noise but no damage to anything other than a shredded
tire and tube.

I was very lucky it happened at low speed, on a flat road and walking
distance from my work. I won't push my luck like that again (I bought the
rim used so I didn't know it's mileage history) as it would have been very
ugly if it happened while descending!!

Vicki

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Vicki Schroeder

I second replacing/checking your rims especially if they have a lot of winter miles on them. I had an old Mavic rear rim on my winter bike fail - the side wall/lip of the rim that holds the tire on collapsed and sheared off. Made a heck of a noise but no damage to anything other than a shredded tire and tube.

I was very lucky it happened at low speed, on a flat road and walking distance from my work. I won't push my luck like that again (I bought the rim used so I didn't know it's mileage history) as it would have been very ugly if it happened while descending!!

Vicki

Erik

Alloy nipples are a concern because they are extremely susceptible to weather and can decay rapidly. In the shop I occasionally true a 5 year+ old wheel set and the nipples crumble with the lightest pressure from a spoke wrench.

This commonly happens long before a rim's brake surface begins to wear through. I recently replaced all the alloy nipples on a pair of my own wheels because they were all crumbling after too many miles in wet conditions. ODOT's de-icer can accelerate this issue.

On a long enough time line and with enough weather exposure, everything is biodegradable. So go with brass nips on the commuter wheels, folks.

- Erik

From: dan@bicyclerepairman.us
To: elongride@hotmail.com; dansilvernail@comcast.net; obra@list.obra.org
Subject: Re: [OBRA Chat] Bike part longevity?
Date: Tue, 1 Jul 2008 14:31:51 -0700

I wouldn't worry so much about alloy nipples but the
braking surface of the rim instead. I have seen the results of a number of rims
that have failed catastrophically and never at a convenient
time.

----- Original Message -----
From:
Erik

To: dansilvernail@comcast.net ; obra@list.obra.org
Sent: Tuesday, July 01, 2008 12:50
PM
Subject: Re: [OBRA Chat] Bike part
longevity?

The parts you're referring to don't experience much friction,
so they don't generally "wear out". However, a carbon fork with the kind
of mileage you're talking about could become a concern. That sort of
thing should be removed for a close inspection to check for
cracks/inconsistencies in the carbon and to check the bond between the carbon
and the metal (any movement is a red flag).

If I had to make an
educated guess, though, I'd say that if you've stored the bike indoors and
you've ridden it on the road only and haven't made a habit of crashing, you're
probably fine. Carbon forks are one of the most over-tested products in
existence, so typical riding stress is a non-issue.

The parts that wear
out frequently - aside from rubber - are things like the chain and everything
that the chain touches. Your wheels - if they also have 40,000 miles on
them - may also be overdue for a rebuild, especially if they have alloy
nipples.

-Erik

To: obra@list.obra.org
From: dansilvernail@comcast.net
Date: Tue, 1
Jul 2008 19:23:05 +0000
Subject: [OBRA Chat] Bike part longevity?

Sent via BlackBerry by AT&T

From: "Silvernail, Dan"

Date: Tue, 1 Jul 2008
12:04:42 -0700
To:
dansilvernail@comcast.net
Subject:

Here is a question for you all about bike part longevity:

My primary road bike is close to 8 yrs old now, and most of the parts
are original especially the "contact" parts such as the seatpost, stem,
handlebars. Also, I really don't know how old the carbon fork is (it
has a metal steerer) because I bought it used but I would think it is a
minimum of 8 yrs old.

So the question is, how long does that stuff last? My best guess
is that the bike has about 40,000 miles on it. I would hate to be
motoring down Germantown Road and have something break.

The i’m Talkaton. Can 30-days of conversation change the world? Find out now.

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Dan H

I wouldn't worry so much about alloy nipples but the braking surface of the rim instead. I have seen the results of a number of rims that have failed catastrophically and never at a convenient time.
----- Original Message -----
From: Erik
To: dansilvernail@comcast.net ; obra@list.obra.org
Sent: Tuesday, July 01, 2008 12:50 PM
Subject: Re: [OBRA Chat] Bike part longevity?

The parts you're referring to don't experience much friction, so they don't generally "wear out". However, a carbon fork with the kind of mileage you're talking about could become a concern. That sort of thing should be removed for a close inspection to check for cracks/inconsistencies in the carbon and to check the bond between the carbon and the metal (any movement is a red flag).

If I had to make an educated guess, though, I'd say that if you've stored the bike indoors and you've ridden it on the road only and haven't made a habit of crashing, you're probably fine. Carbon forks are one of the most over-tested products in existence, so typical riding stress is a non-issue.

The parts that wear out frequently - aside from rubber - are things like the chain and everything that the chain touches. Your wheels - if they also have 40,000 miles on them - may also be overdue for a rebuild, especially if they have alloy nipples.

-Erik

----------------------------------------------------------------------------
To: obra@list.obra.org
From: dansilvernail@comcast.net
Date: Tue, 1 Jul 2008 19:23:05 +0000
Subject: [OBRA Chat] Bike part longevity?

Sent via BlackBerry by AT&T

----------------------------------------------------------------------------
From: "Silvernail, Dan"
Date: Tue, 1 Jul 2008 12:04:42 -0700
To: dansilvernail@comcast.net
Subject:

Here is a question for you all about bike part longevity:

My primary road bike is close to 8 yrs old now, and most of the parts are original especially the "contact" parts such as the seatpost, stem, handlebars. Also, I really don't know how old the carbon fork is (it has a metal steerer) because I bought it used but I would think it is a minimum of 8 yrs old.

So the question is, how long does that stuff last? My best guess is that the bike has about 40,000 miles on it. I would hate to be motoring down Germantown Road and have something break.

------------------------------------------------------------------------------
The i’m Talkaton. Can 30-days of conversation change the world? Find out now.

------------------------------------------------------------------------------

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gschreckchat@comcast.net

I would consider replacing the stem, bars and seatpost, particularly if they are aluminum. They may have outlived their fatigue life. You may want to contact the manufacturers of those parts.

--

George Schreck
gschreckchat@comcast.net
(503) 502-0425

-------------- Original message --------------
From: Erik
The parts you're referring to don't experience much friction, so they don't generally "wear out". However, a carbon fork with the kind of mileage you're talking about could become a concern. That sort of thing should be removed for a close inspection to check for cracks/inconsistencies in the carbon and to check the bond between the carbon and the metal (any movement is a red flag).

If I had to make an educated guess, though, I'd say that if you've stored the bike indoors and you've ridden it on the road only and haven't made a habit of crashing, you're probably fine. Carbon forks are one of the most over-tested products in existence, so typical riding stress is a non-issue.

The parts that wear out frequently - aside from rubber - are things like the chain and everything that the chain touches. Your wheels - if they also have 40,000 miles on them - may also be overdue for a rebuild, especially if they have alloy nipples.

-Erik

To: obra@list.obra.org
From: dansilvernail@comcast.net
Date: Tue, 1 Jul 2008 19:23:05 +0000
Subject: [OBRA Chat] Bike part longevity?

Sent via BlackBerry by AT&T

From: "Silvernail, Dan"
Date: Tue, 1 Jul 2008 12:04:42 -0700
To: dansilvernail@comcast.net
Subject:

Here is a question for you all about bike part longevity:

My primary road bike is close to 8 yrs old now, and most of the parts are original especially the "contact" parts such as the seatpost, stem, handlebars. Also, I really don't know how old the carbon fork is (it has a metal steerer) because I bought it used but I would think it is a minimum of 8 yrs old.

So the question is, how long does that stuff last? My best guess is that the bike has about 40,000 miles on it. I would hate to be motoring down Germantown Road and have something break.

The i?m Talkaton. Can 30-days of conversation change the world? Find out now.

Erik

The parts you're referring to don't experience much friction, so they don't generally "wear out". However, a carbon fork with the kind of mileage you're talking about could become a concern. That sort of thing should be removed for a close inspection to check for cracks/inconsistencies in the carbon and to check the bond between the carbon and the metal (any movement is a red flag).

If I had to make an educated guess, though, I'd say that if you've stored the bike indoors and you've ridden it on the road only and haven't made a habit of crashing, you're probably fine. Carbon forks are one of the most over-tested products in existence, so typical riding stress is a non-issue.

The parts that wear out frequently - aside from rubber - are things like the chain and everything that the chain touches. Your wheels - if they also have 40,000 miles on them - may also be overdue for a rebuild, especially if they have alloy nipples.

-Erik

To: obra@list.obra.org
From: dansilvernail@comcast.net
Date: Tue, 1 Jul 2008 19:23:05 +0000
Subject: [OBRA Chat] Bike part longevity?

Sent via BlackBerry by AT&TFrom: "Silvernail, Dan"
Date: Tue, 1 Jul 2008 12:04:42 -0700
To: dansilvernail@comcast.net
Subject:
Here is a question for you all about bike part longevity: My primary road bike is close to 8 yrs old now, and most of the parts are original especially the "contact" parts such as the seatpost, stem, handlebars. Also, I really don't know how old the carbon fork is (it has a metal steerer) because I bought it used but I would think it is a minimum of 8 yrs old. So the question is, how long does that stuff last? My best guess is that the bike has about 40,000 miles on it. I would hate to be motoring down Germantown Road and have something break.
_________________________________________________________________
The i’m Talkaton. Can 30-days of conversation change the world?
http://www.imtalkathon.com/?source=EML_WLH_Talkathon_ChangeWorld

dansilvernail@comcast.net

Sent via BlackBerry by AT&T

-----Original Message-----
From: "Silvernail, Dan"

Date: Tue, 1 Jul 2008 12:04:42
To: dansilvernail@comcast.net
Subject:

Here is a question for you all about bike part longevity:

My primary road bike is close to 8 yrs old now, and most of the parts are original especially the "contact" parts such as the seatpost, stem, handlebars. Also, I really don't know how old the carbon fork is (it has a metal steerer) because I bought it used but I would think it is a minimum of 8 yrs old.

So the question is, how long does that stuff last? My best guess is that the bike has about 40,000 miles on it. I would hate to be motoring down Germantown Road and have something break.