Technical > Transmission
Surly chainrings
jul:
Hi all,
I show you my Surly stainless steel chainring after 20.000 kms
And a new one to compare (only 1 tooth less)
Both of them (on the right the old one)
In my opinion, i dont see a real wear, but maybe i'm wrong..
length teeth : less than 1/2 mm
Width betheen teeth : around 1/2 mm in addition
Do you think i have to change by a new one ? or i can ride many kilometers with the old one ?
I specify than my Rohloff sprockret is used (10.000kms) but can ride still a lot of kilometers..
Usually i change my chain every 5000 kms to prevent the breakage of a link
mickeg:
I do not think you need to change them yet.
If you keep using the old one, the chain and chainring wear in together and it has an even number of teeth. You might note that the old one, the tooth adjacent to the letter L in Surly has more side wear than the tooth adjacent to the letter U. The chainlinks with inner plates have worn the sides of every other tooth more, and that includes the tooth adjacent to the letter L.
For that reason, I think if you keep using the old one that you should make sure that you put your chain on the same way that it was on before, thus a link with inner plates should go on the tooth with the letter L, as the chain and ring have been wearing in together that way.
The other new ring has an odd number of teeth, every revolution the chain links will alternate, on each tooth, first an inner plate, then an outer plate, then an inner plate, etc. Thus, each tooth will wear the same way as every other tooth, so that is not an issue.
martinf:
When you have finished using one side, if you haven't already done it you can turn the ring over and use the other side.
This can also be done with the threaded sprockets, not sure about the new splined ones.
mickeg:
--- Quote from: martinf on November 21, 2021, 06:30:41 pm ---When you have finished using one side, if you haven't already done it you can turn the ring over and use the other side.
...
--- End quote ---
Can you do that with Surly rings?
martinf:
--- Quote from: mickeg on November 21, 2021, 10:34:23 pm ---Can you do that with Surly rings?
--- End quote ---
Yes, it says "Like all things mechanical, it will eventually wear out. When it does, simply flip the chainring around and you’ll get another lifespan out of it." on this official Surly site:
https://surlybikes.com/parts/stainless_steel_chainrings.
I haven't yet needed to do this with any of the Surly rings on family bikes, but have been doing it for years with flat Sturmey-Archer sprockets on those bikes that have them.
The Sturmey-Archer sprockets are dirt cheap (3 to 5 euros) so it would not seem worthwhile, but I have to order them as they aren't easy to find locally so it saves on shipping and hassle.
IMO it's definitely worthwhile for more expensive chainrings and Rohloff sprockets, so long as the design of the ring/sprocket makes it possible.
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