Origin8 Track/SS Chainring Issue
 

Just put a new crankset with chainring on a road bike. Put on a a chain, tightened nuts, and had a tight chain. But, when I started riding the chain fell off. I examined and it appeared the chain wasn't fitting in between the teeth in most parts of the chainring even when I tried to push it in.

The 3/32" chain measurement doesn't appear to me to be a problem because it is somewhat snug in spots and the ring is advertised as 3/32". My guess was the 1/2" measurement is at issue. My other guess was regarding the height of the chain. I have been using KMC Z33 and KMC Z50. I think it is the Z50 that is marked narrow. In any event, the chain I was using is marked narrow. Perhaps narrow regards the height and a limited height prohibits the rollers to fit in. But, as I think about it, I bet a too high chain could prohibit rollers from fitting in between teeth.

I did use a lot of oil and then some degreaser to clean up. Maybe it needs more degreaser.

Liquids rarely are a problem when chains have teeth fit issues. So too with chain side plate (is this what is called "height") dimensions. What is a MAJOR factor in chain fit is the inner (between the side plates) width and what the tooth width is. So I suspect you have too narrow a chain for the teeth width. You know mislabeling does happen. But this is an easy fix. Andy

"track" ring requires a 1/8" chain, which will not work if your bike has multiple rear gears.

single speed bike? get a 1/8" chain, plain and simple fix.

It's actually very simple.

The plates shouldn't touch the chain ring. It's the rollers that should engage tyhe sprocket, with the plate's sole function being to keep the rollers coming at 1/2" on center intervals. When all is good, there's be slop between the inside of the inner plates and the sprocket.

The allowance for clearance on a 3/32" chain has just shy of what's needed for a hard fit on an 1/8" sprocket, but as noted, that's not a fit. So, either buy a 3/32"sprocket, or a 1/8" chain.

I was mistaken in believing the ring to be 3/32". As suggested, a 1/8" chain was needed.