How to fix bent chainring teeth in 2 easy steps

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After you’ve watched this video you know how to fix bent chainring teeth, no matter what chainring they’re on. Although I performed this procedure at home and removed the entire crankset you can also fix your chainring while on the road. You can do this with the crankset on the bicycle.

In my case they we’re on the middle chainring of a triple crankset which was riveted. So there was no way for me to remove just the faulty chainring and perform the fix.

Bent chainring teeth can be caused by a number of things. And normally they occur on the biggest chainring since its teeth are most exposed. If you don’t have a bash guard (old mtb’s like mine don’t) anything that impacts your crank is bound to impact the teeth on the biggest ring. A log, a rock, anything you try to get over while riding.

I had bent chainring teeth on the middle chainring and couldn’t remember any accidents. So they must have come because of bad shifting. Since I had done some mountain bike trails with this bike which was detrimental to the drivetrain, this must’ve been the cause.

The teeth we’re bent towards the frame. This meant that I tried to move to the granny ring (smallest chainring) before a very steep climb. I had replaced the mtb crank with a touring crank (bigger rings) so I frequently had to use the smallest ring to finish climbs. With a front-derailleur not shifting correctly and the chain in between rings, a massive amount of force was exerted on 3 teeth, causing them to bent.

Something I didn’t realize at the time since I only felt a sudden twang go through the chain with each rotation while riding in sixth or seventh gear (of my 7-speed).

Tools used
Padre 15mm Pedal Wrench 831
Park Tool Crank Bolt Wrench CCW-5C: https://www.frank.nl/park-tool-ccw-5c...
Park Tool Universal Crank Puller CWP-7: https://www.chainreactioncycles.com/p...
Park Tool Adjustable Wrench PAW-12: https://www.chainreactioncycles.com/n...
Hammer
Block of Wood

I've also written about blog post with more information. If you want to read this article go to https://www.restoration.bike/bike-rep...

Visit my website for more bike restoration tutorials: https://www.restoration.bike/

Music is from the YouTube Audio Library
Song is "Song of Sadhana" from Jesse Gallagher