Join Date: Jul 2006
Location: Columbus, OH
Bikes: '08 Surly Cross-Check, 2011 Redline Conquest Pro, 2012 Spesh FSR Comp EVO, 2015 Trek Domane 6.2 disc
Just a picky technical thing, it's your outer chainring that's bent. Two crankarms and one bottom bracket comprise the main body of "the crank" which has a spider on one side to attach your chainrings.
I'm a big guy who used to powerlift, and I've bent my share of cheap chainrings. Buy the strongest chainrings that your LBS can get for you, and you'll have less problems. I think that the issue with us big & strong riders has to do with a combination of stress fatigue on the chainrings from cross-gearing and high force.
From a dead standstill, many of us gear down to the largest cog to get an easier start. Do that from the large ring, and you've got some good side torque on that ring. The large ring has the longest fulcrum (from the bolts) so the stress to the metal is greater.
Cap that with the massive force that a 100Kg+ rider generates, and you've got a recipe for bending chainrings like they were made of taffy.
Try dead starts from your middle ring and a middle cog to keep your chainline straighter, and spin up through your gears rather than standing and mashing a high gear off the starting line.
"I feel like my world was classier before I found cyclocross."
- Mandi M.