BCD 130 53 T chainring . Are all the same ?
#1
Senior Member
Thread Starter
Join Date: Mar 2016
Location: North of Boston
Posts: 898
Bikes: 1973 Schwinn Sports Tourer plus a " few" more :)
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 211 Post(s)
Liked 199 Times
in
147 Posts
BCD 130 53 T chainring . Are all the same ?
Hi,
Looking to replace the large chainring.
Here is a pic of current
Will any that size work ?
Appreciate your time and help
Looking to replace the large chainring.
Here is a pic of current
Will any that size work ?
Appreciate your time and help
#2
Senior Member
Join Date: Jan 2017
Posts: 1,064
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 350 Post(s)
Likes: 0
Liked 122 Times
in
90 Posts
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.
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.
#3
Senior Member
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,767
Bikes: lots
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 1958 Post(s)
Liked 2,932 Times
in
1,489 Posts
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.
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.
#4
Senior Member
Details can be found at
https://bike.bikegremlin.com/3555/bi...ion-standards/
#5
Friendship is Magic
Join Date: Nov 2010
Location: Sacramento, CA
Posts: 22,985
Bikes: old ones
Mentioned: 304 Post(s)
Tagged: 0 Thread(s)
Quoted: 26427 Post(s)
Liked 10,384 Times
in
7,212 Posts
.
...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.
...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.
__________________
#6
Friendship is Magic
Join Date: Nov 2010
Location: Sacramento, CA
Posts: 22,985
Bikes: old ones
Mentioned: 304 Post(s)
Tagged: 0 Thread(s)
Quoted: 26427 Post(s)
Liked 10,384 Times
in
7,212 Posts
.
...yours looks like a more modern design. You should probably seek to replace it with similar.
...yours looks like a more modern design. You should probably seek to replace it with similar.
__________________
#7
Senior Member
Thread Starter
Join Date: Mar 2016
Location: North of Boston
Posts: 898
Bikes: 1973 Schwinn Sports Tourer plus a " few" more :)
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 211 Post(s)
Liked 199 Times
in
147 Posts
Thanks for the response concerning the chainring.
Chain width good discussion as well
Chain width good discussion as well