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Too much power?

Posted: Mon Mar 12, 2012 8:16 pm
by Nate
Image

[youtube]http://www.youtube.com/watch?v=sMUq70oKIvQ&list=UUwIXNr1QTL3eu1_GKeOcjXQ&index=2&feature=plcp[/youtube]
[youtube]http://www.youtube.com/watch?v=rCD4Z-DcqXw&list=UUwIXNr1QTL3eu1_GKeOcjXQ&index=1&feature=plcp[/youtube]

SOOO close to going down... no damage done, managed to keep it up...

Re: Too much power?

Posted: Mon Mar 12, 2012 8:24 pm
by Nobody
Too much torque. That's what kills transmissions usually.

You broke a steel spindle. Sogood will be pleased...

What model was it?

Re: Too much power?

Posted: Mon Mar 12, 2012 8:24 pm
by toolonglegs
Well it is a power climb there :D ...especially if you want to make happy hour on the corner!.
Post a picture with correct exposure :P .

Re: Too much power?

Posted: Mon Mar 12, 2012 8:35 pm
by Nobody
Nate, you're a heavier rider, aren't you?
Also how many Kms on the BB?

Re: Too much power?

Posted: Mon Mar 12, 2012 8:56 pm
by Parrott
Nobody wrote:Nate, you're a heavier rider, aren't you?
Also how many Kms on the BB?


Stop looking for excuses and mitigating factors. Everyone knows steel is prone to failure at anytime and often catastrophically without warning :P Next thing you'l be having us believe Brooks Saddles are comfortable :roll: :mrgreen:

Re: Too much power?

Posted: Mon Mar 12, 2012 9:05 pm
by wombatK
Very pleased you didn't get hurt.

Was it a one-legged pedal the rest of the way home ? Have seen a disabled guy doing this around the flats at Kyeemagh/Wolli Creek, can we assume a fit and able Nate would have pedaled it home ?

Cheers

Re: Too much power?

Posted: Mon Mar 12, 2012 9:11 pm
by Nate
92kgs...
It was a $300 cell single speed... had about 1000-1500k's i guess? weekly commuter 100k's a week & i treat it with respect.
The stock plastic pedals normally take 2 weeks to crack

Its a cheap POS bike, but i'm starting to call "not fit for purpose"...
Image

Re: Too much power?

Posted: Mon Mar 12, 2012 9:15 pm
by il padrone
Psst! Don't say anything about the stair-jumps you've been doing on your way home from work :P

Re: Too much power?

Posted: Mon Mar 12, 2012 9:27 pm
by sogood
Parrott wrote:Stop looking for excuses and mitigating factors. Everyone knows steel is prone to failure at anytime and often catastrophically without warning :P Next thing you'l be having us believe Brooks Saddles are comfortable :roll: :mrgreen:

+1! :mrgreen: :mrgreen: :mrgreen:

Seriously, glad you (Nate) weren't hurt. Congratulations on joining TLL on the high altar! But your spectacular "show-off" in front of the bus shelter crowd made me a tad suspicious. 8)

Re: Too much power?

Posted: Mon Mar 12, 2012 9:40 pm
by trailgumby
That's a fatigue crack, except for the shiny bit down the bottom, which was the last bit to let go.

Not good after such a short distance. No odd noies or creaking before the failure?

Good save and glad there was nothing behind you!

Re: Too much power?

Posted: Mon Mar 12, 2012 10:07 pm
by sogood
Fact is, a $300 bike was never made for a power rider like Nate. I call it bike abuse! :wink:

Re: Too much power?

Posted: Mon Mar 12, 2012 10:18 pm
by Nobody
Thanks Nate for the reply. :)

sogood wrote:
Parrott wrote:Stop looking for excuses and mitigating factors. Everyone knows steel is prone to failure at anytime and often catastrophically without warning :P Next thing you'l be having us believe Brooks Saddles are comfortable :roll: :mrgreen:

+1! :mrgreen: :mrgreen: :mrgreen:
:lol: Yes, very funny. And of course I have an excuse. I don't defend all steel. You can make anything substandard for strength and durability, even in steel. Cell seem to have a history of "good value" bikes that fail when used as commuters. Eg:
viewtopic.php?f=12&t=17764
viewtopic.php?f=41&t=17766

I suppose if you scape the bottom of the barrel for parts, you are going to get some failures long term.

It looks like the crack was propagating under the crank. To me, that is the most dangerous type of fault as you can't see the crack forming. Steerers have the same problem.

Re: Too much power?

Posted: Tue Mar 13, 2012 9:26 am
by m@
Nobody wrote:Thanks Nate for the reply. :)

sogood wrote:
Parrott wrote:Stop looking for excuses and mitigating factors. Everyone knows steel is prone to failure at anytime and often catastrophically without warning :P Next thing you'l be having us believe Brooks Saddles are comfortable :roll: :mrgreen:

+1! :mrgreen: :mrgreen: :mrgreen:
:lol: Yes, very funny. And of course I have an excuse. I don't defend all steel. You can make anything substandard for strength and durability, even in steel. Cell seem to have a history of "good value" bikes that fail when used as commuters. Eg:
http://www.bicycles.net.au/forums/viewt ... 12&t=17764
http://www.bicycles.net.au/forums/viewt ... 41&t=17766

I suppose if you scape the bottom of the barrel for parts, you are going to get some failures long term.

It looks like the crack was propagating under the crank. To me, that is the most dangerous type of fault as you can't see the crack forming. Steerers have the same problem.

Yes, they had a couple of dodgy batches of handlebars and steerers - 'bars were recalled (my bike - and Nate's roadie IIRC - were affected). I notice that they've ditched that manufacturer (Zoom) in favour of FSA on at least some bikes.

Nate, you should've converted the Team to SS! :wink:

Re: Too much power?

Posted: Tue Mar 13, 2012 9:52 am
by Old and Rusty
I break stuff all the time Nate, the number of timber steps and ladders on building sites and bike chains is a worry. Being 6'4" and 110kg will test anything so I'm guessing that the bike was in a price range not intended for the 92kg, power and use it's getting. My first road bike a Jamis was purchased because they warrant it for up to 140kg and I even managed to crack a weld on that. I buy Record and Dura Ace chains exclusively now.

Re: Too much power?

Posted: Tue Mar 13, 2012 10:05 am
by familyguy
Nice to see the guy at the bus stop showing concern for your wellbeing and safety Nate. Did not move a muscle... :roll:

Jim

Re: Too much power?

Posted: Tue Mar 13, 2012 10:10 am
by twizzle
trailgumby wrote:That's a fatigue crack, except for the shiny bit down the bottom, which was the last bit to let go.

Not good after such a short distance. No odd noies or creaking before the failure?

Good save and glad there was nothing behind you!


When you have a fatigue crack, the polished area is where the parts have been moving relative to each other and is the first bit that has let go, the crystalline surfaces mark where the last bit let go.

Re: Too much power?

Posted: Tue Mar 13, 2012 10:49 am
by human909
It doesn't matter how cheap the bike is . The fact is that a crank breaking is an unacceptable safety issue. Bike stores need to wake up to this because ultimately they bear the risk.

Re: Too much power?

Posted: Tue Mar 13, 2012 10:53 am
by Baalzamon
human909 wrote:It doesn't matter how cheap the bike is . The fact is that a crank breaking is an unacceptable safety issue. Bike stores need to wake up to this because ultimately they bear the risk.

Glad you pulled up safe from that one Nate and managed to stay upright. It's not the crank that broke, it's the BB axle that broke.

Re: Too much power?

Posted: Tue Mar 13, 2012 11:36 am
by norbs
Nate wrote:92kgs...
It was a $300 cell single speed... had about 1000-1500k's i guess? weekly commuter 100k's a week & i treat it with respect.
The stock plastic pedals normally take 2 weeks to crack

Its a cheap POS bike, but i'm starting to call "not fit for purpose"...
Image



Wow, I think we had those tiles in our old bathroom! :D

Re: Too much power?

Posted: Tue Mar 13, 2012 12:24 pm
by philip
Did you pedal the rest of the way home one legged?

Re: Too much power?

Posted: Tue Mar 13, 2012 12:34 pm
by trailgumby
twizzle wrote:
trailgumby wrote:That's a fatigue crack, except for the shiny bit down the bottom, which was the last bit to let go.

Not good after such a short distance. No odd noies or creaking before the failure?

Good save and glad there was nothing behind you!


When you have a fatigue crack, the polished area is where the parts have been moving relative to each other and is the first bit that has let go, the crystalline surfaces mark where the last bit let go.

Sorry, yes you're quite right and I got that arse-about. :oops:

Re: Too much power?

Posted: Tue Mar 13, 2012 12:37 pm
by rkelsen
Nate wrote:Its a cheap POS bike, but i'm starting to call "not fit for purpose"...

I think you're right. That is really poor and disappointing component life. I'd take it back to Cell and see if they'll fix it under warranty.
Nate wrote:The stock plastic pedals normally take 2 weeks to crack

My cheapo commuter still has its original plastic pedals after 14 months and >10,000km... I'm heavier than you (and a masher).

Re: Too much power?

Posted: Tue Mar 13, 2012 3:59 pm
by Parrott
norbs wrote:

Wow, I think we had those tiles in our old bathroom! :D


We had that carpet like that in the house we just sold. Good hard wearing stuff, just used to pill a fair bit :)

Re: Too much power?

Posted: Tue Mar 13, 2012 4:58 pm
by sogood
human909 wrote:It doesn't matter how cheap the bike is . The fact is that a crank breaking is an unacceptable safety issue...

Yes, steel explodes! :wink:

Re: Too much power?

Posted: Tue Mar 13, 2012 5:00 pm
by sogood
philip wrote:Did you pedal the rest of the way home one legged?

Nate clearly has enough power but may get a muscular imbalance with too much one legged training. :mrgreen: