Stronglight double to single

Mark said:

Hi

<snip>

Quoted message said:

Anyone have any idea a) what sort of chainset it might be, and b)
whether I can get a single ring for it?

Cheers,

Mark

a) no idea.
b) You've got one - use the middle ring (somewhere between 36t-42t),
with shorter stack bolts. You can use the middle or outer positions to
get the best chainline.

You could use the large ring (46t-53t?) with a larger rear cog if you
wanted, you just need to figure out what final ratio you want, what
cogs are available, and therefore which of the two front rings will get
you closest to the ratio with one of the available cogs.

If this is a track chain v. road chain issue, rear cogs are available
to suit either chain, so there's no absolute need to change the
chainring.

....or is there somthing obvious I'm missing? Wouldn't be the first
time.

hth

bookieb.

Mark said:

Hi

I've got an old Stronglight chainset that I'd like to convert to a
single ring for a fixed gear project. I've no idea what model it is and
I don't have it with me to look, but it has two rings and the big ring
has lots of little holes drilled in it beneath the teeth, presumably to
save weight. It looks like this:

http://www.velostuf.com/stronglight99x31.jpg

It doesn't have a "normal" spider and bolt like 5-arm Campag or Shimano
sets, but does (IIRC) have some bolts quite close to the centre of the
chainset, like the picture shows.

Anyone have any idea a) what sort of chainset it might be, and b)
whether I can get a single ring for it?

Cheers,

Mark

Looks like a Stronglight 99 or similar, with the obsolete 5 x 86mm
boltcircle. You could use the chainrings you have (with shorter
chainwheelbolts) but finding other rings will be a challenge

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

bookieb said:

Mark said:

Anyone have any idea a) what sort of chainset it might be, and b)
whether I can get a single ring for it?

a) no idea.
b) You've got one - use the middle ring (somewhere between 36t-42t),
with shorter stack bolts. You can use the middle or outer positions
to get the best chainline.

You could use the large ring (46t-53t?) with a larger rear cog if you
wanted, you just need to figure out what final ratio you want, what
cogs are available, and therefore which of the two front rings will
get you closest to the ratio with one of the available cogs.

Oh, yes. Forgot to mention: it looks like both the rings are one
inseperable piece (which itself may come off of the cranks) so I can't
just mount the inner on the outer, so to speak.

Quoted message said:

If this is a track chain v. road chain issue, rear cogs are available
to suit either chain, so there's no absolute need to change the
chainring.

Nope, not too fussed about that.

Cheers,

Mark

Mark said:

Hi

I've got an old Stronglight chainset that I'd like to convert to a
single ring for a fixed gear project. I've no idea what model it is and
I don't have it with me to look, but it has two rings and the big ring
has lots of little holes drilled in it beneath the teeth, presumably to
save weight. It looks like this:

http://www.velostuf.com/stronglight99x31.jpg

Well, that's a picture of a Stronglight Model 99bis, according to this:
http://www.velostuf.com/gallery.htm
But is that your chainset, because that is a triple and you say you've
got a double.

Quoted message said:

It doesn't have a "normal" spider and bolt like 5-arm Campag or Shimano
sets, but does (IIRC) have some bolts quite close to the centre of the
chainset, like the picture shows.

Anyone have any idea a) what sort of chainset it might be, and b)
whether I can get a single ring for it?

a) mentioned above.
b) as mentioned by bookieb, you've already got two, unless they are too
worn or you just want a shinier or lighter one. If so, talk to Spa
Cycles who seem to have knowledge and stock of Stronglight chainrings.
I'm not sure I've ever seen a chainset too worn for use on a fixed gear
bike, though.

JimP

--
Let's think the unthinkable, let's do the undoable, let's prepare to
grapple with the ineffable itself, and see if we may not eff it after
all. - DNA

M-gineering said:

Looks like a Stronglight 99 or similar, with the obsolete 5 x 86mm
boltcircle. You could use the chainrings you have (with shorter
chainwheelbolts) but finding other rings will be a challenge

Let's be charitable and call it obsolescent. Settle Cycles and Spa Cycles
still carry a range of rings:

http://www.spacycles.co.uk/products.php?plid=m2b0s149p0

http://www.settlecycles.co.uk/shop/options.asp?tid=196&pid=711

But from the further description "Mark" gives, I'm not convinced that he
doesn't have a 49D or similar crankset with a 50.4mm primary circle, in
which case TA Cyclotourist rings, also from Spa, would be just the ticket:

http://www.spacycles.co.uk/products.php?plid=m2b0s148p0

James Thomson

M-gineering said:

Mark wrote:

Quoted message said:

Quoted message said:

Anyone have any idea a) what sort of chainset it might be, and b)
whether I can get a single ring for it?

Quoted message said:

Looks like a Stronglight 99 or similar, with the obsolete 5 x 86mm
boltcircle. You could use the chainrings you have (with shorter
chainwheelbolts) but finding other rings will be a challenge

Spa Cycles, frequently recommended in this parish, are your
friends. Or at least they were my friends a few weeks ago: a
whole range of 86mm BCD rings at very reasonable prices.

Worth phoning - they've got more stock than the website
suggests.

John

Mark said:

Oh, yes. Forgot to mention: it looks like both the rings are one
inseperable piece (which itself may come off of the cranks) so I can't
just mount the inner on the outer, so to speak.

<angle grinder>
Inseparable???
</angle grinder>

JimP

--
Let's think the unthinkable, let's do the undoable, let's prepare to
grapple with the ineffable itself, and see if we may not eff it after
all. - DNA

Jim Price said:

Well, that's a picture of a Stronglight Model 99bis, according to this:
http://www.velostuf.com/gallery.htm
But is that your chainset, because that is a triple and you say you've
got a double.

86mm bcd doubles and triples use the same cranks. The triple has the granny
ring spaced out on long stack bolts on the same bolt circle.

James Thomson

Jim Price said:

<angle grinder>

Is someone playing my tune?

...d

Jim Price said:

Mark said:

I've got an old Stronglight chainset that I'd like to convert to a
single ring for a fixed gear project. I've no idea what model it is
and I don't have it with me to look, but it has two rings and the big
ring has lots of little holes drilled in it beneath the teeth,
presumably to save weight. It looks like this:

http://www.velostuf.com/stronglight99x31.jpg

Well, that's a picture of a Stronglight Model 99bis, according to
this: http://www.velostuf.com/gallery.htm But is that your chainset,
because that is a triple and you say you've got a double.

Sorry. Made a bit of a pig's ear of that posting -- serves me right for
doing it 5 seconds before leaving work. I should have said "looks a bit
like" as I don't have it with me (it's at my old house still) and can't
quite remember. Mine's a double but it has the bolts in a similar
position.

Quoted message said:

Quoted message said:

It doesn't have a "normal" spider and bolt like 5-arm Campag or
Shimano sets, but does (IIRC) have some bolts quite close to the
centre of the chainset, like the picture shows.

Anyone have any idea a) what sort of chainset it might be, and b)
whether I can get a single ring for it?

a) mentioned above.
b) as mentioned by bookieb, you've already got
two, unless they are too worn or you just want a shinier or lighter
one. If so, talk to Spa Cycles who seem to have knowledge and stock of
Stronglight chainrings. I'm not sure I've ever seen a chainset too
worn for use on a fixed gear bike, though.

Right-oh. I'll have to have a better look but it sounds like worst case
scenario I'll be able to get hold of rings if needed.

Thanks for the help and apologies for the naff question.

Mark

In article <[email hidden]>, Mark

() said:

Hi

I've got an old Stronglight chainset that I'd like to convert to a
single ring for a fixed gear project. I've no idea what model it is and
I don't have it with me to look, but it has two rings and the big ring
has lots of little holes drilled in it beneath the teeth, presumably to
save weight. It looks like this:

http://www.velostuf.com/stronglight99x31.jpg

It doesn't have a "normal" spider and bolt like 5-arm Campag or Shimano
sets, but does (IIRC) have some bolts quite close to the centre of the
chainset, like the picture shows.

Anyone have any idea a) what sort of chainset it might be, and b)
whether I can get a single ring for it?

As others have said, it's /probably/ one of the Stronglight 86 mm BCD
chainsets. Since they only have one set of bolt holes they can be
swapped between single, double and triple just by adding or subtracting
spacers and bolts of the appropriate length. The one on my fixer, with
a single chainring on the inner side of the spider, started life as a
triple...

--
Dave Larrington - <http://www.legslarry.beerdrinkers.co.uk/>
While you were out at the Rollright Stones, I came and set fire to your
Shed.

in message <[email hidden]>, Mark

(') said:

I've got an old Stronglight chainset that I'd like to convert to a
single ring for a fixed gear project. I've no idea what model it is and
I don't have it with me to look, but it has two rings and the big ring
has lots of little holes drilled in it beneath the teeth, presumably to
save weight. It looks like this:

http://www.velostuf.com/stronglight99x31.jpg

You /cannot/ vandalise that. That is a classic. These things typically
did not leave the factory drilled; drilling them became an obsession of
various UK bike shops catering to the time-trial community, mainly.

Stick it on eBay, and buy a s/h track crankset with the proceeds.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

:: Wisdom is better than weapons of war ::
:: Ecclesiastes 9:18 ::