chain ring replacement

kziegel said:

I have seen it written here that one should replace the chain when
replacing the cassette, for reasons related to wear. I had done this
when replacing my cassette recently, but wondered if I should also
replace the chainrings for the same reasons. Any insights?

Chainrings usually wear more slowly than cassette or freewheel
sprockets in general, although some aluminum ones may wear faster than
some hardened steel types, and the absolute rate of wear will vary
from bike to bike and rider to rider. Inspect and replace as needed;
make no assumptions that any other specific policy always needs to be
followed. Many riders put the majority of their wear on one ring, and
find that they don't need to replace all three at the same time. If
you need to replace all of them, or even two, you may discover that a
replacement crank set with rings is cheaper.
--
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kziegel said:

I have seen it written here that one should replace the chain when
replacing the cassette, for reasons related to wear. I had done this
when replacing my cassette recently, but wondered if I should also
replace the chainrings for the same reasons. Any insights?

There's no reason to replace the cassette every time you replace a chain.
And certainly no reason to replace chainrings that often.

Measure your chain when you have about 2500 miles on it. When a 12-inch
section (12 full links) "stretches" to 12-1/16 inches, replace it. If you
replace your chain before it becomes overly "stretched," your cassette will
last longer. A cassette should outlast several chains.

A decent chainring should last even longer. A chainring is worn when the
teeth show pronounced hooking.

Art Harris

Take good care of your chain, measure it for wear, and replace when
necessary. (I just replace mine every year or 3000 miles. It probably
isn't necessary then, either, but I figure it's relatively cheap insurance.)

I've never had to replace cogs or rings due to wear.

kziegel said:

I have seen it written here that one should replace the chain when
replacing the cassette, for reasons related to wear. I had done this
when replacing my cassette recently, but wondered if I should also
replace the chainrings for the same reasons. Any insights?

Kurt

Arthur Harris wrote in message ...

Quoted message said:

A decent chainring should last even longer. A chainring is worn when the
teeth show pronounced hooking.

I've always assumed this is where the term chain suck originates, as in the
chain is sucked to the chainring as the ring is worn and the long pitch
chain sticks against the teeth as the chain travels towards the rear
sprocket.

Come to think, I've seen chainrings which are ramped when worn and not
hooked. The tooth profile used allows sprocket whether front or back to be
used until the chain slips off under pressure.

How do hooked teeth preclude a chainrings use, and have you seen this and
experienced any detrimental effect?

Trevor

"Arthur Harris" <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

kziegel said:

I have seen it written here that one should replace the chain when
replacing the cassette, for reasons related to wear. I had done this
when replacing my cassette recently, but wondered if I should also
replace the chainrings for the same reasons. Any insights?

There's no reason to replace the cassette every time you replace a chain.
And certainly no reason to replace chainrings that often.

Measure your chain when you have about 2500 miles on it. When a 12-inch
section (12 full links) "stretches" to 12-1/16 inches, replace it. If you
replace your chain before it becomes overly "stretched," your cassette will
last longer. A cassette should outlast several chains.

A decent chainring should last even longer. A chainring is worn when the
teeth show pronounced hooking.

You flipped around his comment; he (correctly) stated one should
replace the chain when replacing cassettes, not replacing cassettes
when replacing chains.

Your advice about checking wear to determine wear before replacing a
chain is good, but depending on riding type and other factors if one
waits until 2500 miles they may have worn out chainrings and cassettes
by riding for quite a bit on a 'overly stretched' chain. Around here,
with lots of hills, most folks get only 1000-2000 miles, tops, on a
chain. Personally, I tend to get 1200-1800 miles, so I check every
time I clean my chain. Takes 30 seconds or so. Lest anyone jump on
the '9 speed chains wear faster' nonsense, the chains on my 6 speed
bikes wear just as fast as the 9 speed chains. I have noticed no
difference in longevity between SRAM, Shimano, and Wippermann branded
chains.

- rick

Rick Warner wrote in message ...

Quoted message said:

by riding for quite a bit on a 'overly stretched' chain. Around here,
with lots of hills, most folks get only 1000-2000 miles, tops, on a
chain. Personally, I tend to get 1200-1800 miles, so I check every
time I clean my chain. Takes 30 seconds or so. Lest anyone jump on
the '9 speed chains wear faster' nonsense, the chains on my 6 speed
bikes wear just as fast as the 9 speed chains. I have noticed no
difference in longevity between SRAM, Shimano, and Wippermann branded
chains.

She must be fit, the lady in the bike shop.
Or do you work in the bike shop?]

Trevor