Has anyone else heard any "naysaying" regarding the use of an odd # of teeth on your rear cog? I want to run a 32:21 set up on a new 29er (Tahoe rides primarily), but seems like I heard someone dissing on using an odd numbered amount of teeth on your rear cog while running an even number of teeth up front at the chainring.
Even vs. Odd # of Teeth on Freewheel/Cog
Wrex Everything
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Has anyone else heard any "naysaying" regarding the use of an odd # of teeth on your rear cog? I want to run a 32:21 set up on a new 29er (Tahoe rides primarily), but seems like I heard someone dissing on using an odd numbered amount of teeth on your rear cog while running an even number of teeth up front at the chainring.
Sheldon Brown talks about this. Basically when you run an odd number on one or both it results in even wear on every tooth throughout the life of the chain. If you use even number and always put the chain on the same teeth you can wear out half the teeth at a time.
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Hmm, never thought about that. Good thing to keep in mind, especially since my 32:20 is a bit too spinny for around here. Maybe I'll step up one.Schmucker said:
Also, I know it makes a difference when riding a fixie, as the number of 'skid patches' [also on Sheldon's site]. Even numbered cogs on front and back lead to fewer skid patches in general.
I learned the fixie thing the hard way, some even:even gear ratios can really destroy a tire. I think number of skid patches is equal to the lowest common denominator of the cog and chainring. When I was running 48:16 it took no time to wear the tire bald in the 3 spots.dashSC said:Hmm, never thought about that. Good thing to keep in mind, especially since my 32:20 is a bit too spinny for around here. Maybe I'll step up one.
Also, I know it makes a difference when riding a fixie, as the number of 'skid patches' [also on Sheldon's site]. Even numbered cogs on front and back lead to fewer skid patches in general.
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Sooo, if anything, am I hearing that it's actually a good idea to go odd-numbered on your cog/freewheel?Schmucker said:
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Sure, the effect might not be very significant, but nonsense? Why not extend the drivetrain life if possible. cog + chain + ring of good quality can approach $100.fat guy said:
It actually makes no difference either way for most of us I'm sure. I pull my chain off frequently to clean it. Any time you drop a chain, or change a flat, the chain is no longer on that teeth. You have a 50/50 chance of putting it back on the same teeth as before unless you mark it. Odds are you're going to wear it all out evenly.
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If you use even number and always put the chain on the same teeth you can wear out half the teeth at a time.
I would like to understand how can one reach such a strange conclusion. The only thing that makes sense is to change the position of the chain on the ring and cog so that you avoid the same teeth being in the same position through the power phase of the pedal stroke.
I would like to understand how can one reach such a strange conclusion. The only thing that makes sense is to change the position of the chain on the ring and cog so that you avoid the same teeth being in the same position through the power phase of the pedal stroke.
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racerdave posted this calculator before and totally makes sense if you are running fixed. if you enter an odd numbered cog, notice the skid patch analysis and you will see that the skid position is evenly distributed on every pedal stroke unlike the even numbered cogs. this explains the tire wear for fixies. and i think, the same applies to a freewheeler on his drivetrain wear. odd numbered drive = even wear. odd/odd combo = best.
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But that calculator is for skid patches. First you cannot translate skid patches to a freewheel for obvious reasons. You can barely translate it to a fixed cog, since the chain wrap will certainly distribute the force over many teeth (unlike the skid patch on the tire).
Common guys use some common sense. With 32:16 you get one skid patch. Is somebody going to theorize that 1 tooth will get worn on the cog? Common!
Common guys use some common sense. With 32:16 you get one skid patch. Is somebody going to theorize that 1 tooth will get worn on the cog? Common!
I think you have quality confused with overpriced components, but that's another topic.chairthruster said:
You only benefit from even-even if you plan on running your chain until it falls apart. Who wants to be out in the woods when pins start shearing off? :madman:
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