cog wear test?

is there an easy way to check for cog wear at home?

Reason I ask is that I have two bikes with identical cassettes. One has
maybe 100-200 miles on it, one has at least 500 plus miles on it by me
plus who knows how many by a previous owner (old chain checked at about
50% worn with the ProGold gauge) due to me messing around and swapping
parts the new cassette ended up on the bike with the old drivetrain.
Not sure if it's worth swapping them back around or not to make sure the
parts on the bike with the new drivetrain last longer.

yeah, I know, it would only take a beer or so to swap them, but now I'm
curious if I could somehow measure wear and *know* if it's worth it.

nate

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On Oct 16, 6:41 pm, Nate Nagel wrote:
is there an easy way to check for cog wear at home?

Reason I ask is that I have two bikes with identical cassettes. One has
maybe 100-200 miles on it, one has at least 500 plus miles on it by me
plus who knows how many by a previous owner (old chain checked at about
50% worn with the ProGold gauge) due to me messing around and swapping
parts the new cassette ended up on the bike with the old drivetrain.
Not sure if it's worth swapping them back around or not to make sure the
parts on the bike with the new drivetrain last longer.

yeah, I know, it would only take a beer or so to swap them, but now I'm
curious if I could somehow measure wear and *know* if it's worth it.


Eyeball the cogs (the area between the teeth on a sprocket) for
visible wear. Other than that, put a new chain on it, push hard on
the pedal, and see if the chain tries to ride up on the sprocket.

On 17 Oct, 02:41, Nate Nagel wrote:
is there an easy way to check for cog wear at home?

Reason I ask is that I have two bikes with identical cassettes. *One has
maybe 100-200 miles on it, one has at least 500 plus miles on it by me
plus who knows how many by a previous owner (old chain checked at about
50% worn with the ProGold gauge) *due to me messing around and swapping
parts the new cassette ended up on the bike with the old drivetrain.
Not sure if it's worth swapping them back around or not to make sure the
parts on the bike with the new drivetrain last longer.

yeah, I know, it would only take a beer or so to swap them, but now I'm
curious if I could somehow measure wear and *know* if it's worth it.


A chain may be used continuously with a sprocket set until the chain
rides off the sprocket teeth. As long as the teeth are not hooked
through frequent early chain replacement old sprockets may be used
with new chain. It is wasteful to use an old 'stretched' chain with
new sprockets and you may experience problems when you use a brand new
chain on a sprocket set that has not had a chain worn in from new.
The classic method is to rotate three chains on one sprocket set,
swapping with the least worn of the remaining two. it's not essential
to measure the chains, you can just swap them every 1000 miles (more
is probable) say. Clean them and relubricate. My own thoughts are
now to use a heavy grease which can be melted in. More complicated
methods may be employed using wax, but whatever you see as simplest in
getting a wet lubricant in and keeping it there is probably best.

Nate Nagel wrote:

is there an easy way to check for cog wear at home?

The only reliable alternative to riding that I'm aware of is to
use one of these:
http://www.rohloff.de/en/products/hg...eck/index.html

John

On Fri, 16 Oct 2009 21:41:30 -0400, Nate Nagel wrote:

is there an easy way to check for cog wear at home?

Reason I ask is that I have two bikes with identical cassettes. One has
maybe 100-200 miles on it, one has at least 500 plus miles on it by me
plus who knows how many by a previous owner (old chain checked at about
50% worn with the ProGold gauge) due to me messing around and swapping
parts the new cassette ended up on the bike with the old drivetrain.
Not sure if it's worth swapping them back around or not to make sure the
parts on the bike with the new drivetrain last longer.

yeah, I know, it would only take a beer or so to swap them, but now I'm
curious if I could somehow measure wear and *know* if it's worth it.

nate

A gear-tooth caliper will measure it, but to know if/how much it is worn
you will need a reference - either a good new one or the correct
mathematical form. How much, for you, is too much is another question.

Chain and cog wear are not binary in their effect - except at such a
pronounced degree that any competent cyclist would have long since replaced
them. Ride until the shifting performance no longer is acceptable, then
fix.