Chain wear measurement

Jasper Janssen wrote:
On Tue, 16 Aug 2005 19:24:48 -0700, jim beam wrote:


ok, for a 6" section, roller to roller, i average the following, in mm:

sram pc1 - 14.480
sram pc58 - 14.518
shimano hg93 - 14.500
shimano cn7701 - 14.502


The what now? Check your calculations and measurements. This would be a
whopping 14% off-pitch for *all* of these guys.

Jasper

er, this is from roller to roller... as stated before.

wrote:
Johnnie Walker writes:


Carl, I have several different brands of new-in-box chain and a
decent dial caliper. I'll make some measurements for you tonight.
It's an exercise I've already done before, but I'll repeat for the
record.


OK, for a 6" section, roller to roller, I average the following, in mm:


SRAM pc1 - 14.480
SRAM pc58 - 14.518
Shimano hg93 - 14.500
Shimano cn7701 - 14.502


I notice you obscure these measurements by overlaying roller diameters
on roller clearances on chain pitch so it is impossible to see what
the number of merit, their pitches are.

wow, that was impressive!!! i state roller to roller, but you
deliberately obfuscate by attempting to confuse with chain pitch!!! you
got chutzpah, boy!


The differences you see are most likely roller to sleeve clearances or
even wobbly rollers because they are narrow and have a propensity to
yaw.

er, you don't think i know to measure in the middle of a roller?

To determine that you'll need to disassemble the chains and get
their inside dimensions.

rubbish. if the manufacturer specs a measurement from roller to roller,
who are you to try changing the whole engineering landscape? the guy
with the wooden ruler. what a joke.

The ones I measures have differences like
those but the all have an accurate 1/2" pitch over their length.


These are brand new in box, 3 different section, 3 different
measurement per section, means calculated. The pc1 is track chain &
real tight, just as stated further up this thread. The Shimano are
consistent with each other, at least to my satisfaction. The pc58,
the aftermarket derailleur chain is clearly built "loose". As I
stated before, this accomodates a little sprocket wear and "favors"
the manufacturer's repeat sales business.


You are imagining this!

Jobst Brandt

yeah, i imagine strain aging stainless steel with an endurance limit
too. oh, wait. that's you. sorry.

41 wrote:
jim beam wrote:

wrote:


I have a box full of SRAM chains and none show any visible deviation
from 1/2" pitch over their length, all pins lining up with 1/2" marks
on a steel rule.


measuring anything with
some old wooden ruler you found at the bottom of your old school bag is
just a joke.


Hey genius, can't you read? Oh wait, of course not, we've learned that
a long time ago, and you remind us of it in every post.


#ok, for a 6" section, roller to r oller, i average the following, in
mm:
#
#sram pc1 - 14.480
#sram pc58 - 14.518
#shimano hg93 - 14.500
#shimano cn7701 - 14.502
#
#these are brand new in box, 3 different section, 3 different
measurement
#per section, means calculated.

Did someone say half-inch (12.7mm) pitch?

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juvenile idiot.