bikemike73 

Hi,

Looking to replace the large chainring.

Here is a pic of current

Will any that size work ?

Appreciate your time and help

tomtomtom123

Some chainrings are thicker than others by around +/-1mm to 2mm from the outside face to the inside of the ramps. The thicker ramps may catch the chain faster by reducing the gap to the middle chainring, but if you have a triple with smaller jumps in number of teeth, then the difference in shifting performance may not be noticeable. I have a 44/24 double, so the 20T jump is more problematic and the size of the gap makes some difference, so I use spacers to make the gap smaller (my crank spider mounts both chainrings on the inside surface of the spider, so I can decrease the gap with spacers. If yours mounts on opposite sides of the spider, then the gap can only be made wider).

The thickness at the bolt holes / mounting surface can also vary, but the ones I had that were really thick at the ramps had the bolt holes / mounting surface milled thinner than the ramps.

But generally, I think almost any chainring made for the outside of a triple should work for you. The rated speed may make some difference though, as the ones made for higher speeds have thinner teeth to match the thinner chains.

cxwrench

So you're saying that chains for 10, 11, and 12 speed are narrower between the inside links?

Hondo6

Short answer: 9-12 speed chains indeed have smaller internal width than 6-7-8 speed. Outside width also generally is progressively smaller as the number of speeds go up.

Details can be found at

https://bike.bikegremlin.com/3555/bi...ion-standards/

3alarmer 

.
...chainring design has progressed over the years. While any 53 tooth ring of the correct width for your chain will work, the older ones (of the sort I use a lot) were just a straight up regular cut tooth profile, all the way around the ring. Gradually, companies that make them started adding in ramps and differing profiles on the teeth in certain spots, to make them pick up the chain quicker, and make shifting more of a positive experience. So anything with the same number of teeth, same BCD, and same width works. Just some might work better than others.


Ancient Chainring

Slightly more modern, but still ancient technology, chainring

Improved chainring with some fancier tooth profiling

Super hi tech chainring, with ramps, and scientifically designed tooth profiling. It does everything but shift itself.

3alarmer 

.
...yours looks like a more modern design. You should probably seek to replace it with similar.

bikemike73 

Thanks for the response concerning the chainring.


Chain width good discussion as well