shimano assistance please?

IanB wrote: The rings appear to be held by bolts

Quoted message said:

which accept approx 7mm allen key. However that will not

What happens ? Do the bolts rotate and not loosen ? I so yo need to hold the nut on the back. There
is a tool available especially for this, like a thin screw driver with a slot in the middle. Another
tool has the same blade but is bent through 90 degrees rather like one of those blanks in the back
of a PC. Wiggle has one for four or five pounds. I have always fancied one of these but never really
needed one.

Is the bolt stuck fast and you are in danger of rounding the allen key fitting ?

The inside ring is fixed with a blind threaded hole in the crank spider, no nut.

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The Reply & From email addresses are checked rarely.

In message <[email hidden]>, IanB
<[email hidden]> writes

Quoted message said:

As you ,ay have noticed in other threads/responses of mine, I have a fixed wheel set-up to
refurbish. My current problem is the chainwheel. As single chain wheels seem as rare as
crocodiles in the River Lee the obvious solution is to use a redundant spider and fit an
appropriate single ring.

You can actually get them from both Condor and Cycle Surgery, either Dura Ace for those with deep
wallets, or from Miche, which are more than adequate and quite cheap to boot. An entire groupset
IIRC came in at 250 quid.

Quoted message said:

There's the problem. I have a redundant shimano 26/36/46. Model unknown but crank marked FC-A413.

That would be RSX 🙂

Quoted message said:

The rings appear to be held by bolts which accept approx 7mm allen key. However that will not
shift any of them. Before I get really vicious with them am I approaching this correctly? I do
not want to hit these bolts hard only to find they are not really bolts and that I should have
undone something else (i.e. done something with the slots inside the middle ring). Can anyone
advise me please?

Usually (and I think with these cranks although I've not seen a pair for a while) you need to undo
the bolts with an allen key on the outside and a chainring bolt tool on the inside (Or big
screwdriver) although you can usually get them started just with an allen key). The small ring is
held by bolts threaded into the crank spider and so just need the allen key loosened.

Try a bit of GT-85 or similar to loosen them up, if not wing it into your LBS who should be able to
get the bolts started for you.

HTH

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Thomas Letherby Remove NOSPAM to reply.

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

Quoted message said:

IanB wrote: The rings appear to be held by bolts

Quoted message said:

which accept approx 7mm allen key. However that will not

What happens ? Do the bolts rotate and not loosen ? I so yo need to hold

the

Quoted message said:

nut on the back. There is a tool available especially for this, like a

thin

Quoted message said:

screw driver with a slot in the middle. Another tool has the same blade

but

Quoted message said:

is bent through 90 degrees rather like one of those blanks in the back of

a

Quoted message said:

PC. Wiggle has one for four or five pounds. I have always fancied one of these but never really
needed one.

Settle has one for three :-)

I've used it, helped a bit.

If you're on rotating bolts, you could always sacrifice them with a drill. The crank hole is 10mm.

cheers, clive

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

Quoted message said:

In message <[email hidden]>,

IanB

Quoted message said:

<[email hidden]> writes

Quoted message said:

As you ,ay have noticed in other threads/responses of mine, I have a fixed wheel set-up to
refurbish. My

current

Quoted message said:

Quoted message said:

problem is the chainwheel. As single chain wheels seem

as

Quoted message said:

Quoted message said:

rare as crocodiles in the River Lee the obvious solution

is

Quoted message said:

Quoted message said:

to use a redundant spider and fit an appropriate single ring.

You can actually get them from both Condor and Cycle

Surgery, either

Quoted message said:

Dura Ace for those with deep wallets, or from Miche, which

are more than

Quoted message said:

adequate and quite cheap to boot. An entire groupset IIRC

came in at 250

Quoted message said:

quid.

Quoted message said:

There's the problem. I have a redundant shimano 26/36/46. Model unknown

but

Quoted message said:

Quoted message said:

crank marked FC-A413.

That would be RSX 🙂

Quoted message said:

The rings appear to be held by bolts which accept approx 7mm allen key. However that will

not

Quoted message said:

Quoted message said:

shift any of them. Before I get really vicious with

them

Quoted message said:

Quoted message said:

am I approaching this correctly? I do not want to hit these bolts hard only to find they are not
really bolts

and

Quoted message said:

Quoted message said:

that I should have undone something else (i.e. done something with the slots inside the middle
ring). Can anyone advise me please?

Usually (and I think with these cranks although I've not

seen a pair for

Quoted message said:

a while) you need to undo the bolts with an allen key on

the outside and

Quoted message said:

a chainring bolt tool on the inside (Or big screwdriver)

although you

Quoted message said:

can usually get them started just with an allen key). The

small ring is

Quoted message said:

held by bolts threaded into the crank spider and so just

need the allen

Quoted message said:

key loosened.

Try a bit of GT-85 or similar to loosen them up, if not

wing it into

Quoted message said:

your LBS who should be able to get the bolts started for

you.

Quoted message said:

HTH

--
Thomas Letherby Remove NOSPAM to reply.

Thanks for feedback, looks like it is as I expected (by the way the allen key feels a loose fit
and liable to "round off" before bolt moves). Will try for best fit , some GT85 or easing oil and
then add a stilson to the equation. Failing that, grovel to the LBS when I try to buy the
replacement ring etc.

IanB