Chainset maintenance

Danny Colyer <[email hidden]> wrote:
: are required in order to shift from the middle ring to the granny. More
: often than not the chain will get stuck between the two rings (if I'm

You've put it together wrong so there's no a bigger gap between the
two rings.

Check:

The rings are the right way round (writing facing the outside)
The chainring bolts are correctly fastened and tight (allen key bit to the outside)
The rings are in the right orentation (usually there's a little peg on
the big ring that goes behind the crankarm. Then align the rest so that
the writing lines up (ie where is say 22 on one ring aligns with the
32 on the next)

Arthur

--
Arthur Clune PGP/GPG Key: http://www.clune.org/pubkey.txt
Don't get me wrong, perl is an OK operating system, but it lacks a
lightweight scripting language -- Walter Dnes

On Wed, 16 Mar 2005 00:14:44 +0000, Danny Colyer wrote:

8<

Quoted message said:

I'm going to have to separate the rings again and screw them back
together in the correct alignment. Are there any tricks for getting the
alignment right? It's a Shimano Tiagra chainset.

You can download service instructions from the Shimano website. There is a
specific way to put chainsets together.
http://www.shimano-europe.com/cycling/catalogue/content_prodx.phtml?pid=10263&psid=39

--
Mike

Arthur Clune said:

You've put it together wrong so there's no a bigger gap between the
two rings.

Check:

The rings are the right way round (writing facing the outside)
The chainring bolts are correctly fastened and tight (allen key bit to the outside)
The rings are in the right orentation (usually there's a little peg on
the big ring that goes behind the crankarm. Then align the rest so that
the writing lines up (ie where is say 22 on one ring aligns with the
32 on the next)

Thanks Arthur (and David, both replies were very helpful).

I've had the chainset apart again this evening and I couldn't find *any*
writing on any of the rings. I found a hole in the big ring (perhaps it
had a peg in it once), which by chance I had lined up with the crank. I
found another hole in the middle ring, which I hadn't lined up.

I then started zooming in on photos that I've taken in the past. I
can't be certain from the photos, but it appears that I had put the
outer 2 rings on the right way round and the granny on the wrong way
round. Each ring has grooves around the outer edge of one side (they
look similar to the grooves on a record). I had assumed that the
grooves would go on the crank side of each ring. From the photos, it's
clear that the grooves on the granny ring should go on the other side,
but it looks as though they go on the crank side of the outer two rings.
Doing this does bring the granny ring slightly closer to the middle ring.

I've put it back together with the holes in the outer two rings lined up
with the crank. I noticed then that each ring had a tooth lined up
exactly with the centre of the crank, so I lined up the granny ring to
also have a tooth lined up exactly with the centre of the crank.

It's shifting reliably now in the workshop. I'll give it a proper test
tomorrow.

--
Danny Colyer (the UK company has been laughed out of my reply address)
<URL:http://www.speedy5.freeserve.co.uk/danny/>
"He who dares not offend cannot be honest." - Thomas Paine

mb said:

You can download service instructions from the Shimano website. There is a
specific way to put chainsets together.
http://www.shimano-europe.com/cycling/catalogue/content_prodx.phtml?pid=10263&psid=39

Thanks Mike. I wish I'd seen that before I took the chainset apart for
the second time. It looks as though I may still have the middle ring
the wrong way round, but I think I'll see how it works over the next
couple of days before taking it apart for a third time.

--
Danny Colyer (the UK company has been laughed out of my reply address)
<URL:http://www.speedy5.freeserve.co.uk/danny/>
"He who dares not offend cannot be honest." - Thomas Paine

Arthur Clune said:

The rings are the right way round (writing facing the outside)

I've just checked my own recently installed Tiagra triple chainset and
the etched name and size markings on the middle and inner rings are
facing inwards, ie readable from the non-drive side of the bike. HTH.

d.

davek said:

I've just checked my own recently installed Tiagra triple chainset and
the etched name and size markings on the middle and inner rings are
facing inwards, ie readable from the non-drive side of the bike. HTH.

I assumed the chainset to be Tiagra based on the front mech being
Tiagra. I'm starting to wonder if the chainset itself is just a cheap
imitation. The rings look similar to those in the diagrams that Mike
posted a link to, but there seem to be no name or size markings on any
of the rings.

Actually, just had a look at the current Street Machine specs
<http://www.hpvelotechnik.com/produkte/sm/gt/ausstattung_e.html> and
although a Tiagra front mech is specified, the chainset specified is
Tracer. So I guess I've been providing duff information when requesting
help - sorry. Thanks, though.

--
Danny Colyer (the UK company has been laughed out of my reply address)
<URL:http://www.speedy5.freeserve.co.uk/danny/>
"He who dares not offend cannot be honest." - Thomas Paine

davek <[email hidden]> wrote:

: I've just checked my own recently installed Tiagra triple chainset and
: the etched name and size markings on the middle and inner rings are
: facing inwards, ie readable from the non-drive side of the bike. HTH.

Bizarre. I've never ever seen that before

--
Arthur Clune PGP/GPG Key: http://www.clune.org/pubkey.txt
Don't get me wrong, perl is an OK operating system, but it lacks a
lightweight scripting language -- Walter Dnes

Arthur Clune said:

Bizarre. I've never ever seen that before

I presumed it was because they wouldn't be readable from the drive
side, due to the large chainring being in the way.

Or maybe they were installed on to the crank wrongly at the factory!

Either way, they seem to shift pretty smoothly. The middle and inner
rings have extra "half teeth" (can't think what else to call them)
rivetted on to the inside of the ring - presumably to aid chain pick-up
when shifting up.

The outside ring has the word "Tiagra" quite plainly visible in bold
white type, as do the crank and both front and rear mechs. They are not
shy of their branding, Shimano.

d.

Arthur Clune said:

davek <[email hidden]> wrote:

: I've just checked my own recently installed Tiagra triple chainset and
: the etched name and size markings on the middle and inner rings are
: facing inwards, ie readable from the non-drive side of the bike. HTH.

Bizarre. I've never ever seen that before

Um, that's the way it should be... From the service instructions;
"For the FC-4403, the tooth number marking on the largest chainring should
face outward, and the markings on the intermediate and smallest chainrings
should face inward".

--
Mike

mb <[email hidden]> wrote:

: Um, that's the way it should be... From the service instructions;
: "For the FC-4403, the tooth number marking on the largest chainring should
: face outward, and the markings on the intermediate and smallest chainrings
: should face inward".

Oh I wasn't disputing it was right, just that it seems a very odd way
to do things. Campag and TA at least keep it simple.

Arthur

--
Arthur Clune PGP/GPG Key: http://www.clune.org/pubkey.txt
Don't get me wrong, perl is an OK operating system, but it lacks a
lightweight scripting language -- Walter Dnes