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Crank arm & flying mount question
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 2011-10-26 7:06 PM |
Expert  1051   Bradenton, Florida |  Subject: Crank arm & flying mount questionTonight I had my left crank arm come off while riding. Kind of scary when you're doing 24+ trying to run down a group and all of a sudden your crank arm and pedal are dangling from your cleat! Anyway, my question is, do you think doing a flying mount from the left side could lead to this happening? During my races and BRICKS, I always jump on and off of my bike from the left side.
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| 2011-10-26 7:14 PM in reply to: #3739674 |
Master 2236  Denison Texas | Subject: RE: Crank arm & flying mount question No-The pic doesn't show real clearly on my machine but I'm thinking it had come lose or some other failure, not the flying mounts unless you have some super human strength. |
| 2011-10-26 7:46 PM in reply to: #3739674 |
Veteran 221 Riverdal NJ | Subject: RE: Crank arm & flying mount question Im by no means a bike mechanic but it looks like there is a piece missing. What i mean is shouldnt the crank clamp onto something? |
| 2011-10-26 7:51 PM in reply to: #3739674 |
| Davenport, IA | Subject: RE: Crank arm & flying mount question The pinch bolts possibly weren't tight enough. That can happen over time, or due to not being tightened enough when the bike was built. |
| 2011-10-26 9:29 PM in reply to: #3739704 |
Master 1883 San Antone, Texas | Subject: RE: Crank arm & flying mount question jeeper9281 - 2011-10-26 7:46 PM Im by no means a bike mechanic but it looks like there is a piece missing. What i mean is shouldnt the crank clamp onto something? Yeah, like maybe a bottom bracket spindle? I haven't worked on these new fangled bikes, been a few years since i've been a wrench turner... but ummm.... yeah, kinda need one of those. |
| 2011-10-26 9:42 PM in reply to: #3739674 |
Expert 1051 Bradenton, Florida | Subject: RE: Crank arm & flying mount question Ok, you guys got me, the right side pedal assembly slid to the right, leaving the end of the crank shaft inside the bottom bracket. (And to think, a year ago I didn't know what any of those parts were!) |
| 2011-10-26 10:14 PM in reply to: #3739674 |
Champion 10668 Tacoma, Washington | Subject: RE: Crank arm & flying mount question Two things:* The pinch bolts (I know the Gossamer cranks I have on a few bikes have two) were loose.*The bolt that threads into the BB spindle on that side is missing. This prevents the crankarm from falling off if the pinch bolts are loose.looser |
| 2011-10-27 3:11 AM in reply to: #3739674 |
Pro 5892 , New Hampshire | Subject: RE: Crank arm & flying mount question This is why you should always use a torque wrench and periodically check that everything is still torqued down to proper value. |
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