one for sheldon "knows about nexus" brown

panda said:

I have a nexus 7spd, and some time ago purchased a different size cog for the hub. question is ,
how easy is it to change these things?

IIRC, Nexus use the same cog attachment as Sturmey Archer have used for a long time (ie, three
fairly small halfmoon bumps in a fairly large hole), held on by a lockspring. You'd need to remove
the wheel, grab a couple of old screwdrivers, pry off the lockspringring, replace the cog, taking
care to keep the spacers in the same order, replace the ring, and mount it back. Should be less than
a 15 minute job if you've done it before, maybe a bit more if you're feeling your way along slowly.

Jasper

Jasper Janssen said:

panda said:

I have a nexus 7spd, and some time ago purchased a different size cog for the hub. question is ,
how easy is it to change these things?

IIRC, Nexus use the same cog attachment as Sturmey Archer have used for a long time (ie, three
fairly small halfmoon bumps in a fairly large hole), held on by a lockspring. You'd need to remove
the wheel, grab a couple of old screwdrivers, pry off the lockspringring,

Using screwdrivers to remove a lockspring is dangerous to you and to the lockspring Go out & buy a
pair of pliers specially designed for this task

Quoted message said:

replace the cog, taking care to keep the spacers in the same order, replace the ring, and mount it
back. Should be less than a 15 minute job if you've done it before, maybe a bit more if you're
feeling your way along slowly.

Jasper

Etaoin Shrdlu said:

Using screwdrivers to remove a lockspring is dangerous to you and to the lockspring Go out & buy a
pair of pliers specially designed for this task

Puh-lease. It's a frigging circular wire clip, same as on any coaster brake hub. It ain't rocket
science and it ain't dangerous.

I use a single small flat-bladed screwdriver. In many years and countless cog changes I have never
had any occasion to reconsider my method (though the clip does sometimes snap back into place half a
dozen times before I can tease it loose). I'm not sure how the task could be significantly easier--
let alone safer-- even with the use of a special pliers.

Chalo Colina

Etaoin Shrdlu <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

Jasper Janssen said:

panda said:

I have a nexus 7spd, and some time ago purchased a different size cog for the hub. question is
, how easy is it to change these things?

IIRC, Nexus use the same cog attachment as Sturmey Archer have used for a long time (ie, three
fairly small halfmoon bumps in a fairly large hole), held on by a lockspring. You'd need to
remove the wheel, grab a couple of old screwdrivers, pry off the lockspringring,

Using screwdrivers to remove a lockspring is dangerous to you and to the lockspring Go out & buy a
pair of pliers specially designed for this task

There's no special tool for removing the Sturmey/Shimano snapring- removing it was a matter of
carefully prying it off with narrow screwdrivers. (That's what they taught us in Schwinn school.) It
doesn't have the holes for conventional snapring pliers.

Here's an exploded view:
shimano-europe.comSG 7R42.pdfOpen ↗ and here's the service
instructions: shimano-europe.com7R42A.pdfOpen ↗

Note that you will have to remove and reinstall the shift mechanism to get at the sprocket snapring.

Jeff

Jeff Wills said:

Etaoin Shrdlu <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

Jasper Janssen said:

On Tue, 10 Jun 2003 09:21:13 +0100, "panda" <[email hidden]> wrote:

> I have a nexus 7spd, and some time ago purchased a different size cog for the hub. question is
> , how easy is it to change these things?

IIRC, Nexus use the same cog attachment as Sturmey Archer have used for a long time (ie, three
fairly small halfmoon bumps in a fairly large hole), held on by a lockspring. You'd need to
remove the wheel, grab a couple of old screwdrivers, pry off the lockspringring,

Using screwdrivers to remove a lockspring is dangerous to you and to the lockspring Go out & buy
a pair of pliers specially designed for this task

There's no special tool for removing the Sturmey/Shimano snapring- removing it was a matter of
carefully prying it off with narrow screwdrivers. (That's what they taught us in Schwinn school.)
It doesn't have the holes for conventional snapring pliers.

Here's an exploded view:

shimano-europe.comSG 7R42.pdfOpen ↗

Quoted message said:

and here's the service instructions:

shimano-europe.com7R42A.pdfOpen ↗

Quoted message said:

Note that you will have to remove and reinstall the shift mechanism to get at the sprocket
snapring.

Jeff

cheers for that jeff. last night i swapped the sprocket with the use of a small screwdriver. it was
indeed easy, and did take 15mins! so thanks very much!

panda

[email hidden] (blech) wrote in message
news:<[email hidden]>...

Quoted message said:

[email hidden] (Bluto) wrote in message
news:<[email hidden]>...

Quoted message said:

Etaoin Shrdlu said:

Using screwdrivers to remove a lockspring is dangerous to you and to the lockspring Go out &
buy a pair of pliers specially designed for this task

Puh-lease. It's a frigging circular wire clip, same as on any coaster brake hub. It ain't rocket
science and it ain't dangerous.

Oh sure, that's what this guy thought,

<ttp://news.bbc.co.uk/olmedia/290000/images/_290235_headwound150.jpg>

You know what they say, "it's not rocket science until someone gets hurt".

Looks like posting an url IS rocket science for some of us!

<news.bbc.co.uk290235 headwound150.jpgOpen ↗

Quoted message said:

Quoted message said:

Etaoin Shrdlu said:

Using screwdrivers to remove a lockspring is dangerous to you and to

the

Quoted message said:

Quoted message said:

Quoted message said:

lockspring Go out & buy a pair of pliers specially designed for this

task

Quoted message said:

[email hidden] (Bluto) wrote in message

news:<[email hidden]>...

Quoted message said:

Quoted message said:

Puh-lease. It's a frigging circular wire clip, same as on any coaster brake hub. It ain't rocket
science and it ain't dangerous.

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

Quoted message said:

Oh sure, that's what this guy thought,

news.bbc.co.uk290235 headwound150.jpgOpen ↗

Quoted message said:

You know what they say, "it's not rocket science until someone gets hurt".

That looks more like the impact of the whole bicycle, not just a circlip. I have no difficulty
removing cog circlips with a single screwdriver. I install them with my fingers (oil the circlip
first and it snaps right into the groove without Herculean machinations)

--
Andrew Muzi yellowjersey.orgyellowjersey.orgOpen ↗ Open every day since 1 April 1971