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-   Clydesdales/Athenas (200+ lb / 91+ kg) (http://www.bikeforums.net/clydesdales-athenas-200-lb-91-kg/)
-   -   Folded a sprocket in half today (http://www.bikeforums.net/clydesdales-athenas-200-lb-91-kg/252732-folded-sprocket-half-today.html)

Turboem1 12-13-06 02:52 PM

Folded a sprocket in half today
 
So I took my 2002 Specialized Rockhopper out for a spin today after installing my new Geax Blade tires. I wanted to see how good the traction on these will be as I got them for snow use. Its not snowing yet so I take them on my lawn. Im in the small cog up front and the third from biggest in the rear. So lets see if these baby's will grip or spin. I stand up and mash the pedals. The front wheel lifts off and they hook amazing. It just rained a little bit so the ground is not muddy but very dense and thick. This is fun, let me do it again. I go to pedal real hard again and the pedals jump real fast. I look down. Oh the chain fell off....wait....the front sprocket is bent in half. Guess they hook a little to good and/or I can generate way to much torque (I weigh 265).

Heres some pics...

Bike
http://www.imagestation.com/picture/...3/eba36ad0.jpg

Carnage
http://www.imagestation.com/picture/...1/eba2f2b3.jpg

http://www.imagestation.com/picture/...9/eba2f25e.jpg

Tires
http://www.imagestation.com/picture/...8/eba2f25d.jpg

Tom Stormcrowe 12-13-06 03:25 PM

Yep, that Clydesdale Power! Now you know why you can do such a strong short sprint, it's all about torque then!http://e.deviantart.com/emoticons/j/jawdrop.gif

cyccommute 12-13-06 05:16 PM

Quote:

Originally Posted by Tom Stormcrowe
Yep, that Clydesdale Power! Now you know why you can do such a strong short sprint, it's all about torque then!http://e.deviantart.com/emoticons/j/jawdrop.gif

Looks to me more like someone forgot a bolt or didn't tighten one enough.

Just a little nitpicking...um! nitpicking... on the crank they are called chainrings. Sprockets on on the wheel. Don't know why but that's the convention.

(51) 12-13-06 05:16 PM

Looks like a litle rust may have weakened the situation as well. Wow. It is a wonder I still have teeth on my sprockets.

By the way, what is the lifespan of a sprocket and chain? My teeth are looking pretty worn and I am experiencing some chain slippage.

Air 12-13-06 06:08 PM

I think typically between 2K - 4K depending on how you ride, take care of the chain/gears, etc...

Air 12-13-06 06:09 PM

And damn man - good job. I came close to doing that on my large chainring - started bending but were too worn to bend it all the way.

Just got new Sugino cranks though - yay!

Bigmark 12-14-06 06:59 AM

Ok we can say it was a loose bolt, or a little rust, but you have to admit that is WAY COOL! If that was me I would be bragging about that one for years to come.

Very cool, and if I were you I would show those pictures to everyone I know.

That is some serious foot pounds baby! Ha Ha Ha

jyossarian 12-14-06 07:30 PM

You didn't need that small charinring anyways. It just slows you down. Remove it, adjust the FD so you can't overshift and keep on trucking.

Air 12-15-06 02:05 AM

Ehh - when I went up to Nyack there were some hills I was standing on the small chainring. Then I gave up and started walking :)

bravozulu 12-15-06 12:24 PM

Quote:

Originally Posted by cyccommute
Looks to me more like someone forgot a bolt or didn't tighten one enough.

Just a little nitpicking...um! nitpicking... on the crank they are called chainrings. Sprockets on on the wheel. Don't know why but that's the convention.

-------------------------------------
I think that that was a "Laugh In" Goldie Hawn routine: "It might be Chainring to you but it's SPROCKET TO ME!!

ax0n 12-15-06 03:01 PM

you need to mount that ring on a nice plaque and hang it on the wall!

royalflash 12-15-06 03:18 PM

I did that with my cheap alivio alu chain ring. I shifted but the shifter wasn´t well adjusted and then I powered too soon going up a hill and just bent the chain ring in half. Then to get home I had to hammer the chain ring flat with a rock- a real caveman repair. After that I put a steel chain ring on.

demo9 12-16-06 11:15 PM

Way to go I have done one similar as well tore the chainring loose and shot the bolt through a bank window. Needless to say paying for a window was not cool, but that's HEAVY METAL DESTRUCTION!!!!

Tom Stormcrowe 12-17-06 07:34 AM

Quote:

Originally Posted by Air
Ehh - when I went up to Nyack there were some hills I was standing on the small chainring. Then I gave up and started walking :)

Wouldn't standing on the pedals be more effective as far as hill climbing goes?:D

Air 12-17-06 09:02 AM

I KNEW I was doing something wrong! :D

smartass

geo8rge 12-17-06 08:09 PM

Damn it chain ring bolts, one more thing I have to check.


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