[Front crankset] Replacing outer ring with chain guard?
Hello,
I'm currently using a 50/40/30 triple crankset + derailleur on a Brompton where I 1) removed the outer 50T, and 2) replaced the middle ring with a 46T. I'd like to install a chain guard as the outer ring. Would this product work if I chose the "use on double chainring" option? Should I order a 46T, 48T, or 50T? Out of curiosity, how do the single/double chainring models differ? Why two models? Thank you. https://cimg1.ibsrv.net/gimg/bikefor...f3ba844dd1.png |
It seems that I am using the rule of 4T more for the guard than the largest ring. Note that these guard rings are relatively heavy. A lighter option would be a ring that meant to work with a plastic guard, if you can find one in your desired size. As to to a dedicated guard for single vs double crankset, it might be the issue of space for the crank. (When necessary you could always trim the ring on your own.) It could be also an issue of mounting bolts, but they mention none in their offer.
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Thanks. I'll try and find one made of plastic instead.
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I've seen folks grind the teeth of the outer rings on a double; making it a guard/protector.
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I think this is funny but a couple of years ago I need a chain guard for on of my folders that had a broken plastic chain guard. I actually made a chain guard out of a 54 tooth chain ring that I filed the teeth off of. Roger
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Originally Posted by 1nterceptor
(Post 21489562)
I've seen folks grind the teeth of the outer rings on a double; making it a guard/protector.
Originally Posted by rhenning
(Post 21490463)
I think this is funny but a couple of years ago I need a chain guard for on of my folders that had a broken plastic chain guard. I actually made a chain guard out of a 54 tooth chain ring that I filed the teeth off of. Roger
Saber saw, I used a fine tooth metal blade, the aluminum clogged up the teeth, I might have used two blades. But I had plenty of blades so that was not a problem. Aluminum is not that heavy, works well for me. Photo is old, later I decided to spray it black to match all the other black stuff. This is obviously not a folder. The chainring I cut was a 52T, the chainring behind it in the inner position on the double crank is a 44T. The guard is a bit bigger than ideal, but it is close enough that I have no desire to replace it. https://cimg0.ibsrv.net/gimg/bikefor...429af560a6.jpg |
Originally Posted by Winfried
(Post 21489211)
Thanks. I'll try and find one made of plastic instead.
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Thanks!
You meant 22.3 cm. |
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Maybe cutting and drilling into an old frisbee would work, if it's flat enough.
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I had a BCD110 50T chainring handy, and it looks like I do need the equivalent of a 52T to cover the 46T outer chainring + chain.
I'm unclear at how chain guards sit on spiders. Do they come/require longer nuts so they can sit on top of the single/outer ring? https://cimg3.ibsrv.net/gimg/bikefor...fd4d2974c5.png |
Originally Posted by Schwinnsta
(Post 21492300)
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Originally Posted by Winfried
(Post 21495021)
Is it a double, with the outer ring used for the chain guard?
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I'll just get the 52T chain guard and see how it goes. At €20, it's not worth trying to file down a chainring.
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Originally Posted by Winfried
(Post 21495138)
I'll just get the 52T chain guard and see how it goes.
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