Potential wheel-rim failure

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

Quoted message said:

2 questions:

1) Is it normal for the rim to wear almost as fast as the pads in this
way?
What is the usual expected life for a rim of this type when using
V-brakes?
Personally I would have expected it to last rather longer!

What sort of pads are you using?

Quoted message said:

Any ideas for replacement 700c rims with a longer life with V-brakes?

If you're prepared to pay, ceramic ones won't wear in this way.

cheers,
clive

[email hidden] wrote:
[snip]

Quoted message said:

2) Should I just wait for the rim to fail totally before buying a new
wheel, or do these things often fail catastrophically when used with
high pressure road bike tyres. I've had an MTB rim fail before and
that went quite slowly and not particularly dangerously...

Don't wait too long. If it does go, it may well go with a big bang. I
had a front rim failure due to wear a few years ago. I had about 3
seconds warning from the rim bulging and banging on the brake blocks,
to 4 inch shards of outer rim and bits of tube & tyre flying across the
road. I'm glad I hadn't quite got to the top of the climb I was doing
as the bit on the other side is usually good for 40 mph!

TL

Quoted message said:

2 questions:

1) Is it normal for the rim to wear almost as fast as the pads in this
way?

What is the usual expected life for a rim of this type when using
V-brakes?
Personally I would have expected it to last rather longer!

It depends largely on the conditions you've used them in, but rims
definitely wear out.

Quoted message said:

2) Should I just wait for the rim to fail totally before buying a new
wheel,
or do these things often fail catastrophically when used with high
pressure
road bike tyres. I've had an MTB rim fail before and that went quite
slowly
and not particularly dangerously...

Yes, they can fail with a big bang and a sudden cessation of wheel
rotation. Ask me how I know. You don't need to replace the whole wheel.
You can fairly easily transfer a new rim onto the existing hub and
spokes as long as the ERD is reasonably close to that of the existing
one.

Quoted message said:

Would appreciate any input as I am currently riding round with severe
paranoia waiting for something to go ping.

That's not paranoia, it's justified anxiety although "ping" is not
really the sound effect I have in mind. If the rim starts to bulge
while you're out riding let most of the air out of the tyre and limp
home. But really you should change your rim now as you may not get this
warning.

Quoted message said:

Any ideas for replacement 700c rims with a longer life with V-brakes?

I'm using Rigida Chrinas from Spa Cycles at the moment. Recommended by
the extremely high mileage Steve Abraham and one or two other audaxers,
but I can't say how well they'll stand up to V-brakes.

--
Dave...

in message <[email hidden]>,

(') said:

Hi all,

I have a Specialized Sirrus "road" bike (flat bars, 700c road wheels,
V-brakes) which is fitted with Alexrims AT400 rims.

see http://www.alexrims.com/

These have a line machined into them which is designed to show that the
rim
has worn out. The line is 0.3mm deep and when it has disappeared it is
time
to replace the rim. Indeed the line on the back wheel has now
disappeared
after only 2,300 miles of use and I have recently noticed that the rear

brakes are very spongy in spite of being correctly adjusted. In the
same
amount of time I have only gone through 2 sets of brake pads and have
not
even replaced the rear tyre yet although it is fairly worn.

2 questions:

1) Is it normal for the rim to wear almost as fast as the pads in this
way?

No, absolutely not.

Quoted message said:

What is the usual expected life for a rim of this type when using
V-brakes?

30-50,000 miles, I would say. I'd certainly be peeved if my rims let go
in less than 20,000.

Quoted message said:

Personally I would have expected it to last rather longer!

2) Should I just wait for the rim to fail totally before buying a new
wheel,

No!

Quoted message said:

or do these things often fail catastrophically when used with high
pressure road bike tyres.

Not always, but certainly sometimes.

Quoted message said:

I've had an MTB rim fail before and that went quite
slowly
and not particularly dangerously...

Would appreciate any input as I am currently riding round with severe
paranoia waiting for something to go ping.

Any ideas for replacement 700c rims with a longer life with V-brakes?

I suggest you need to look at why they wore out so quickly in the first
place. Something is not right there.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; in faecibus sapiens rheum propagabit

In article <[email hidden]>

Quoted message said:

Hi all,

I have a Specialized Sirrus "road" bike (flat bars, 700c road wheels,
V-brakes) which is fitted with Alexrims AT400 rims.

see http://www.alexrims.com/

These have a line machined into them which is designed to show that the
rim
has worn out. The line is 0.3mm deep and when it has disappeared it is
time
to replace the rim. Indeed the line on the back wheel has now
disappeared
after only 2,300 miles of use and I have recently noticed that the rear

brakes are very spongy in spite of being correctly adjusted. In the
same
amount of time I have only gone through 2 sets of brake pads and have
not
even replaced the rear tyre yet although it is fairly worn.

Are you using the rear brake too much? If you ride a lot in the wet you
can expect fairly rapid rim wear on the back as you will tend to use the
rear brake more in slippery conditions, and a wet rim accumulates
abrasive gritty sludge. If however you've been riding mostly in the dry
you would expect more wear on the front, which provides much more
effective stopping power.

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

Quoted message said:

In article <[email hidden]>

Quoted message said:

Hi all,

I have a Specialized Sirrus "road" bike (flat bars, 700c road wheels,
V-brakes) which is fitted with Alexrims AT400 rims.

see http://www.alexrims.com/

These have a line machined into them which is designed to show that the
rim
has worn out. The line is 0.3mm deep and when it has disappeared it is
time
to replace the rim. Indeed the line on the back wheel has now
disappeared
after only 2,300 miles of use and I have recently noticed that the rear

brakes are very spongy in spite of being correctly adjusted. In the
same
amount of time I have only gone through 2 sets of brake pads and have
not
even replaced the rear tyre yet although it is fairly worn.

Are you using the rear brake too much? If you ride a lot in the wet you
can expect fairly rapid rim wear on the back as you will tend to use the
rear brake more in slippery conditions, and a wet rim accumulates
abrasive gritty sludge. If however you've been riding mostly in the dry
you would expect more wear on the front, which provides much more
effective stopping power.

This question is reminiscent of one that I posted a while back. If I was a
rim manufacturer, I would add a *huge* safety margin after the wear
indicators started to show, both to avoid litigation and to encourage
punters to spend money on new rims sooner than they need to. Both my LBS and
I agree that there seems to be loads of use left in my T224s, despite the
little holes having started to appear.

Quoted message said:

30-50,000 miles, I would say. I'd certainly be peeved if my rims let go
in less than 20,000.

Quoted message said:

Personally I would have expected it to last rather longer!

What!! My rims seem to last 5 - 10k miles. Are you sure about these
figures?

cheers
Jacob

normanwisdom said:

Quoted message said:

30-50,000 miles, I would say. I'd certainly be peeved if my rims let go
in less than 20,000.

Quoted message said:

Personally I would have expected it to last rather longer!

What!! My rims seem to last 5 - 10k miles. Are you sure about these
figures?

Mine too.

--
Dave...

in message <[email hidden]>,

normanwisdom (') said:

Quoted message said:

30-50,000 miles, I would say. I'd certainly be peeved if my rims let
go in less than 20,000.

Quoted message said:

Personally I would have expected it to last rather longer!

What!! My rims seem to last 5 - 10k miles. Are you sure about these
figures?

Yes, moderately. I've certainly had rims that I'd done 50k miles on which
were not knackered when stolen. And I've certainly never gone through a
rim in as little as 10k miles. Maybe I don't brake very much.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

[ This mind intentionally left blank ]

in message <[email hidden]>,

dkahn400 (') said:

normanwisdom said:

Quoted message said:

30-50,000 miles, I would say. I'd certainly be peeved if my rims let
go in less than 20,000.

> Personally I would have expected it to last rather longer!

What!! My rims seem to last 5 - 10k miles. Are you sure about these
figures?

Mine too.

That means - for you anyway - you're replacing rims more than once a
year? Really?

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; Madness takes its toll. Please have exact change.

Thanks for all your answers. I suspect the actual mileage you get must
depend on lots of factors such as hilliness and the type of local grit
as well as if you ride in the wet or the dry. I'm sure that how
expensive the rim is must also play a big part, but I would have
thought that if you can get more than 10K miles out of a rim you should
be doing extremely well! My previous rim failure was an MTB rim after
~3,500 miles!!

I ride quite a lot in the wet & all year round as the bike is also
used for commuting, I also have a tendency to ride fast and brake hard
for the many junctions on my way to work. A lot of my riding is on
country lanes and these tend to be quite sandy / gritty. The brake
blocks I have are cartridge V-brake ones from Aztec I think, and they
are set up properly and stop very effectively. I can't see that there
is anything wrong with the setup.

I will seriously consider replacing the rim after hearing the tales of
rim shrapnel flying everywhere, but I think it will have to wait until
after this weekend as I am doing the 65mile Oxford Big Bike ride -
sponsored ride from Blenheim palace this Sunday...

Rupert

normanwisdom said:

Quoted message said:

30-50,000 miles, I would say. I'd certainly be peeved if my rims let go
in less than 20,000.

Quoted message said:

Personally I would have expected it to last rather longer!

What!! My rims seem to last 5 - 10k miles. Are you sure about these
figures?

cheers
Jacob

Simon Brooke said:

in message <[email hidden]>,

dkahn400 (') said:

normanwisdom said:

>
> 30-50,000 miles, I would say. I'd certainly be peeved if my rims let
> go in less than 20,000.
>
> > Personally I would have expected it to last rather longer!

What!! My rims seem to last 5 - 10k miles. Are you sure about these
figures?

Mine too.

That means - for you anyway - you're replacing rims more than once a
year? Really?

'Fraid so. I'm hoping the current Rigidas will last a bit longer than
the 2 Ambrosio Evolutions and the Mavic MA3 I've got through in the
last 12 months.

--
Dave...

Simon Brooke said:

in message <[email hidden]>,
normanwisdom ([email hidden]'😉 wrote:

Quoted message said:

Quoted message said:

What!! My rims seem to last 5 - 10k miles. Are you sure about these
figures?

Yes, moderately. I've certainly had rims that I'd done 50k miles on which
were not knackered when stolen. And I've certainly never gone through a
rim in as little as 10k miles. Maybe I don't brake very much.

Perhaps your technique of slowing down by slamming into granite
boulders instead of pulling on the brake levers has something to do
with this. :-)

--
Dave...

On 23 Jun 2006 05:02:31 -0700, "dkahn400" <[email hidden]>
wrote:

<snip>

Quoted message said:

'Fraid so. I'm hoping the current Rigidas will last a bit longer than
the 2 Ambrosio Evolutions and the Mavic MA3 I've got through in the
last 12 months.

Yebbut, the MA3 is made of finest cheese. Nice cheese, but cheese.

Tim

in message <[email hidden]>,

dkahn400 (') said:

Simon Brooke said:

in message <[email hidden]>,
normanwisdom ([email hidden]'😉 wrote:

Quoted message said:

Quoted message said:

What!! My rims seem to last 5 - 10k miles. Are you sure about these
figures?

Yes, moderately. I've certainly had rims that I'd done 50k miles on
which were not knackered when stolen. And I've certainly never gone
through a rim in as little as 10k miles. Maybe I don't brake very
much.

Perhaps your technique of slowing down by slamming into granite
boulders instead of pulling on the brake levers has something to do
with this. :-)

Yup, it's just possible, isn't it? I have to confess that since the crash
my descending is a little less 'get into a tuck and see what we can
really wind this thing up to' than it used to be. But on the whole air
drag usually does enough to slow me down on road hills - to a speed I'm
comfortable with, anyway.

I always used to use the excuse that I might be [censored] at climbing, but I
could make it up on the descents. Not true, any more, if it ever was.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; 99% of browsers can't run ActiveX controls. Unfortunately
;; 99% of users are using the 1% of browsers that can...
[seen on /. 08:04:02]

Tim Hall said:

On 23 Jun 2006 05:02:31 -0700, "dkahn400" <[email hidden]>
wrote:

<snip>

Quoted message said:

'Fraid so. I'm hoping the current Rigidas will last a bit longer than
the 2 Ambrosio Evolutions and the Mavic MA3 I've got through in the
last 12 months.

Yebbut, the MA3 is made of finest cheese. Nice cheese, but cheese.

It is. The MA3 went out of true when one of the spoke nipples started
to pull through the surface of the rim. One of the Evolutions developed
a large bulge in the sidewall on the way to the York rally last year,
and the other exploded spectacularly on the Severn Bridge a couple of
months ago. Luckily I was going slowly at the time. A couple of hours
earlier I'd been descending at a whisker under 50 mph.

--
Dave...

What sort of brake blocks are you using?

Some sorts are soft and get bits of road grit stuck in them. These then
machine bits of aluminium of the rims which then get stuff in the blocks and
start a vicious circle.

Salmon kool stops don't do this. The shimano tiagra ones that came on my
bike did.

--
Andy Morris

AndyAtJinkasDotFreeserve.Co.UK

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