Seat post breaks

Fractal

How often do seat posts break, and where? Mine (on a 4 yr old Trek 520)
gave way the other day, snapped off horizontally fairly cleanly near top of
tube, just under the goose neck. Wasnt doing anything very strenuous, just
riding to shops. LBS inspected the break and opined it had been cracked for
a while before going. I thought alumimium would probably just fail all of a
sudden, without a crack. Must admit I did have a prang 2 years ago where
bike did a cart wheel and landed on rear of seat. Demolished the seat but
everything else seemed OK. Now I am worried that something else might go.
The new seat post is much longer than the old, LBS said to cut it off if I
wanted to.

fb in sydnee

Wilfred

Fractal wrote:
> How often do seat posts break, and where?

In my experience a seat post breaks only once.

But seriously, I had one break between the post and the clamp.
I am pretty (very?) heavy so that wouldn't have helped.

But since then (20 years) no more probs. I only ever used lower end
alloy posts, no carbon or super light stuff.

I doubt it is a common problem.

Ask at a bike shop that does lots of repairs.

Wilfred

flyingdutch

RATFLMAO

Gal at werk busted her CF seatpost on the Footscray Rd path this week. Being a sponsored AIS rider it was more an inconvenience to her short term than $-wise.

MikeyOz

Ok I am trying to get my head around a seat post cracking and breaking, there is the possibility of some pretty "haenous" injuries is there not ???

Or do they break in a way where for some reason you don't accidently sit down while the seat is no longer there ??

Donga

On Nov 3, 8:22 pm, "Fractal" <fractalbugNOS...@aussie.yahoo> wrote:
> How often do seat posts break, and where? Mine (on a 4 yr old Trek 520)
> gave way the other day, snapped off horizontally fairly cleanly near top of
> tube, just under the goose neck. Wasnt doing anything very strenuous, just
> riding to shops. LBS inspected the break and opined it had been cracked for
> a while before going. I thought alumimium would probably just fail all of a
> sudden, without a crack. Must admit I did have a prang 2 years ago where
> bike did a cart wheel and landed on rear of seat. Demolished the seat but
> everything else seemed OK. Now I am worried that something else might go.
> The new seat post is much longer than the old, LBS said to cut it off if I
> wanted to.
>
> fb in sydnee

I had a bout of testicular trauma when a Real Design carbon post
failed. The clamp was metal on carbon, both splined - more like Real
Dumb Design. I hit a bump with my weight back on the saddle. The
carbon splines let go and the front of the saddle pivoted up and
smacked me in the nuts. Youch! Needless to say I only had to issue
subtle threats to get a refund.

Donga

BT Humble

Fractal wrote:
> How often do seat posts break,

Not terribly often.

> ...and where?

At least 25km from home.


BTH

BT Humble

Fractal wrote:
> How often do seat posts break,

Not terribly often.

> ...and where?

At least 25km from home.


BTH

Nick Payne

On Sun, 04 Nov 2007 19:17:36 +1100, MikeyOz wrote:

> Ok I am trying to get my head around a seat post cracking and breaking,
> there is the possibility of some pretty "haenous" injuries is there not
> ???
>
> Or do they break in a way where for some reason you don't accidently sit
> down while the seat is no longer there ??

The triathlete Jan Rahula, training in Sydney a few years back, had his
seatpost break on a training ride. The jagged end pierced his rectum and
he suffered pretty substantial injuries and blood loss.

Think on that the next time you park your arse on top of your ultra-light-
weight wonder of a seatpost...

Nick Payne

On Sun, 04 Nov 2007 19:17:36 +1100, MikeyOz wrote:

> Ok I am trying to get my head around a seat post cracking and breaking,
> there is the possibility of some pretty "haenous" injuries is there not
> ???
>
> Or do they break in a way where for some reason you don't accidently sit
> down while the seat is no longer there ??

The triathlete Jan Rahula, training in Sydney a few years back, had his
seatpost break on a training ride. The jagged end pierced his rectum and
he suffered pretty substantial injuries and blood loss.

Think on that the next time you park your arse on top of your ultra-light-
weight wonder of a seatpost...

BT Humble

Nick Payne wrote:
> On Sun, 04 Nov 2007 19:17:36 +1100, MikeyOz wrote:
> > Ok I am trying to get my head around a seat post cracking and breaking,
> > there is the possibility of some pretty "haenous" injuries is there not
> > ???
>
> > Or do they break in a way where for some reason you don't accidently sit
> > down while the seat is no longer there ??
>
> The triathlete Jan Rahula, training in Sydney a few years back, had his
> seatpost break on a training ride. The jagged end pierced his rectum and
> he suffered pretty substantial injuries and blood loss.
>
> Think on that the next time you park your arse on top of your ultra-light-
> weight wonder of a seatpost...

*wince*

I'd say "Shit!" but, you know...


BTH

BT Humble

Nick Payne wrote:
> On Sun, 04 Nov 2007 19:17:36 +1100, MikeyOz wrote:
> > Ok I am trying to get my head around a seat post cracking and breaking,
> > there is the possibility of some pretty "haenous" injuries is there not
> > ???
>
> > Or do they break in a way where for some reason you don't accidently sit
> > down while the seat is no longer there ??
>
> The triathlete Jan Rahula, training in Sydney a few years back, had his
> seatpost break on a training ride. The jagged end pierced his rectum and
> he suffered pretty substantial injuries and blood loss.
>
> Think on that the next time you park your arse on top of your ultra-light-
> weight wonder of a seatpost...

*wince*

I'd say "Shit!" but, you know...


BTH

Fractal

"BT Humble" <bt_humble@bigpond.com> wrote in message
news:1194212311.179027.246350@y27g2000pre.googlegroups.com...
> Fractal wrote:
>> How often do seat posts break,
>
> Not terribly often.
>
>> ...and where?
>
> At least 25km from home.
>
>
> BTH
>

Bob boom, I was of course hoping for a long dissertation on metal fatigue
and bending momnents.

I remember a rider on the last day of a Big Ride, from Milthorpe to
Bathurst, riding without a seat. Always wondered if it was for a dare or he
couldnt get a replacement post. Looked bloody tiring. Its hard to steer too.

Anyway the bike shop gave me a cost price replacement. Now I hope the stem
doesnt go. It survived the Gong Ride yesterday.

fb in sydknee

Fractal

"BT Humble" <bt_humble@bigpond.com> wrote in message
news:1194212311.179027.246350@y27g2000pre.googlegroups.com...
> Fractal wrote:
>> How often do seat posts break,
>
> Not terribly often.
>
>> ...and where?
>
> At least 25km from home.
>
>
> BTH
>

Bob boom, I was of course hoping for a long dissertation on metal fatigue
and bending momnents.

I remember a rider on the last day of a Big Ride, from Milthorpe to
Bathurst, riding without a seat. Always wondered if it was for a dare or he
couldnt get a replacement post. Looked bloody tiring. Its hard to steer too.

Anyway the bike shop gave me a cost price replacement. Now I hope the stem
doesnt go. It survived the Gong Ride yesterday.

fb in sydknee

TimC

On 2007-11-04, Donga (aka Bruce)
was almost, but not quite, entirely unlike tea:
> On Nov 3, 8:22 pm, "Fractal" <fractalbugNOS...@aussie.yahoo> wrote:
>> How often do seat posts break, and where? Mine (on a 4 yr old Trek 520)
>> gave way the other day, snapped off horizontally fairly cleanly near top of
>> tube, just under the goose neck. Wasnt doing anything very strenuous, just
>> riding to shops. LBS inspected the break and opined it had been cracked for
>> a while before going. I thought alumimium would probably just fail all of a
>> sudden, without a crack. Must admit I did have a prang 2 years ago where
>> bike did a cart wheel and landed on rear of seat. Demolished the seat but
>> everything else seemed OK. Now I am worried that something else might go.
>> The new seat post is much longer than the old, LBS said to cut it off if I
>> wanted to.
>
> I had a bout of testicular trauma when a Real Design carbon post
> failed. The clamp was metal on carbon, both splined - more like Real
> Dumb Design. I hit a bump with my weight back on the saddle. The
> carbon splines let go and the front of the saddle pivoted up and
> smacked me in the nuts. Youch! Needless to say I only had to issue
> subtle threats to get a refund.

There's a joke here somewhere about only having one ball left and
hence being able to go faster, but I can't see it.

--
TimC
The Sell Dervers are balanced behind another Sell Derver, and both
have their data protected from Badness by a Dedundant Array of
Inexpensive Risks -- Aquarion in ASR revealing the secrets of RAID