7 spd freewheel spacer thickness?

<[email hidden]> wrote in message
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Quoted message said:

How thick are the spacers supposed to be, between the sprockets of a 7
speed freewheel?

Thanks.

Lewis.

Depends on the brand, model and location on the body. Generally around 3mm
but can be from 2.7mm to 3.15mm.

Chas.

* * Chas said:

<[email hidden]> wrote in message

news:[email hidden]...

Quoted message said:

How thick are the spacers supposed to be, between the sprockets of a 7
speed freewheel?

Quoted message said:

Thanks.

Quoted message said:

Lewis.

Depends on the brand, model and location on the body. Generally around 3mm
but can be from 2.7mm to 3.15mm.

Chas.

OK, thanks.

How about if I say Shimano? ( I don't know why I forgot to add this
the first time)

Lewis.

*****

Quoted post said:

How thick are the spacers supposed to be, between the sprockets of a 7
speed freewheel?

Sheldon we miss you :

http://www.sheldonbrown.com/k7.html#spacing

- Don Gillies
San Diego, CA

<[email hidden]> wrote in message
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Quoted message said:

* * Chas said:

<[email hidden]> wrote in message

news:[email hidden]...

Quoted message said:

Quoted message said:

Quoted message said:

How thick are the spacers supposed to be, between the sprockets of a

7

Quoted message said:

Quoted message said:

Quoted message said:

speed freewheel?

Quoted message said:

Thanks.

Quoted message said:

Lewis.

Depends on the brand, model and location on the body. Generally around

3mm

Quoted message said:

Quoted message said:

but can be from 2.7mm to 3.15mm.

Chas.

OK, thanks.

How about if I say Shimano? ( I don't know why I forgot to add this
the first time)

Lewis.

Steel spacers in Shimano 7sp freewheels are listed at 3.1mm.

Shimano 7sp cassettes are listed at 3.1mm for steel spacers and 3.15mm for
resin (plastic) spacers.

I think that some of the later Shimano 7sp HyperGlide freewheels use resin
spacers so they would be 3.15mm.

The difference between steel and resin spacers is only .05mm or .002" so
it's not very significant.

Hope that helps.

Chas.

* * Chas said:

<[email hidden]> wrote in message

news:... On Feb 13 said:

Quoted message said:

<[email hidden]> wrote in message

news:[email hidden]...

Quoted message said:

Quoted message said:

> How thick are the spacers supposed to be, between the sprockets of a

7

Quoted message said:

Quoted message said:

> speed freewheel?

Quoted message said:

Quoted message said:

> Thanks.

Quoted message said:

Quoted message said:

> Lewis.

Quoted message said:

Quoted message said:

Depends on the brand, model and location on the body. Generally around

3mm

Quoted message said:

Quoted message said:

but can be from 2.7mm to 3.15mm.

Quoted message said:

Quoted message said:

Chas.

Quoted message said:

OK, thanks.

Quoted message said:

How about if I say Shimano? ( I don't know why I forgot to add this
the first time)

Quoted message said:

Lewis.

Steel spacers in Shimano 7sp freewheels are listed at 3.1mm.

Shimano 7sp cassettes are listed at 3.1mm for steel spacers and 3.15mm for
resin (plastic) spacers.

I think that some of the later Shimano 7sp HyperGlide freewheels use resin
spacers so they would be 3.15mm.

The difference between steel and resin spacers is only .05mm or .002" so
it's not very significant.

Hope that helps.

Chas.

Thanks, I appreciate it.

I'll bet the resin spacers are fractionally thicker to allow for them
compressing upon installation. ?

Lewis.

*****

[email hidden said:

"] I'll bet the resin spacers are fractionally thicker to allow for them compressing upon installation?

Given their lateral cross-section area and the torque used in assembly that shouldn't be possible. But the resin spacers (I looked at latest) looks like they're cast, and the sides that goes against the sprockets aren't perfectly flat, but rather visibly concave. So they might need the extra thickness to compensate for production imperfection.
Steel spacers are probably cut from stock which'd make their dimensions more exact.

dabac said:

Quoted message said:

I'll bet the resin spacers are fractionally thicker to allow for them
compressing upon installation?

Given their lateral cross-section area and the torque used in assembly
that shouldn't be possible. But the resin spacers (I looked at latest)
looks like they're cast, and the sides that goes against the sprockets
aren't perfectly flat, but rather visibly concave. So they might need
the extra thickness to compensate for production imperfection.

Maybe just a worn mould.

Lou

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

Quoted message said:

Quoted message said:

I'll bet the resin spacers are fractionally thicker to allow for them
compressing upon installation?

Given their lateral cross-section area and the torque used in assembly
that shouldn't be possible. But the resin spacers (I looked at latest)
looks like they're cast, and the sides that goes against the sprockets
aren't perfectly flat, but rather visibly concave. So they might need
the extra thickness to compensate for production imperfection.
Steel spacers are probably cut from stock which'd make their dimensions
more exact.

--
dabac

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

Quoted message said:

Quoted message said:

I'll bet the resin spacers are fractionally thicker to allow for them
compressing upon installation?

Given their lateral cross-section area and the torque used in assembly
that shouldn't be possible. But the resin spacers (I looked at latest)
looks like they're cast, and the sides that goes against the sprockets
aren't perfectly flat, but rather visibly concave. So they might need
the extra thickness to compensate for production imperfection.
Steel spacers are probably cut from stock which'd make their dimensions
more exact.

--
dabac

All of the Shimano 7sp spacers that I've measured with a micrometer are
pretty accurate - 3.1mm or 3.15mm. The amount of torque applied to the
screw-on sprockets is probably sufficient to compress the plastic spacers
..05mm (.002"😉. Why else would Shimano go to the effort of making them
wider?

Chas.

* * Chas said:

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

Quoted message said:

Quoted message said:

I'll bet the resin spacers are fractionally thicker to allow for them
compressing upon installation?

Given their lateral cross-section area and the torque used in assembly
that shouldn't be possible. But the resin spacers (I looked at latest)
looks like they're cast, and the sides that goes against the sprockets
aren't perfectly flat, but rather visibly concave. So they might need
the extra thickness to compensate for production imperfection.
Steel spacers are probably cut from stock which'd make their dimensions
more exact.

--
dabac

All of the Shimano 7sp spacers that I've measured with a micrometer are
pretty accurate - 3.1mm or 3.15mm. The amount of torque applied to the
screw-on sprockets is probably sufficient to compress the plastic spacers
..05mm (.002"😉. Why else would Shimano go to the effort of making them
wider?

Chas.

Well, I'm only suggesting - the ones I have aren't rectangular, the sides that goes against the sprockets are slightly concave. So if you were to aim for a slight overshoot at the edge, then you'd be pretty much dead on target in the middle. And the raised edges would more easily compress down until the whole spacer makes contact with the sprockets.

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

Quoted message said:

* * Chas said:

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

Quoted message said:

[email hidden] Wrote:
> I'll bet the resin spacers are fractionally thicker to allow for

them

Quoted message said:

> compressing upon installation?

Given their lateral cross-section area and the torque used in

assembly

Quoted message said:

that shouldn't be possible. But the resin spacers (I looked at

latest)

Quoted message said:

looks like they're cast, and the sides that goes against the

sprockets

Quoted message said:

aren't perfectly flat, but rather visibly concave. So they might

need

Quoted message said:

the extra thickness to compensate for production imperfection.
Steel spacers are probably cut from stock which'd make their

dimensions

Quoted message said:

more exact.

--
dabac

All of the Shimano 7sp spacers that I've measured with a micrometer
are
pretty accurate - 3.1mm or 3.15mm. The amount of torque applied to the
screw-on sprockets is probably sufficient to compress the plastic
spacers
..05mm (.002"😉. Why else would Shimano go to the effort of making them
wider?

Chas.

Well, I'm only suggesting - the ones I have aren't rectangular, the
sides that goes against the sprockets are slightly concave. So if you
were to aim for a slight overshoot at the edge, then you'd be pretty
much dead on target in the middle. And the raised edges would more
easily compress down until the whole spacer makes contact with the
sprockets.

--
dabac

I have a collection of Shimano spacers from messing around with cassettes.
Some of the resin ones are flat but most have the recessed area in the
middle that you mentioned. My guess is that the recess allows the spacer
to compress and act like a spring washer to keep the screwed on sprockets
from loosening.

Chas.