Chainring size?
 

Hi all!

I am looking to get a new chainring for my fixed/single speed conversion.
My cranks are of an late 80'ies Peugeot, but I cannot seem to find a chainring the right
size. Also I am uncertain of which size it is.

When I take a pencil, put it through the center of every bolt hole (of which there is 5),
I then draw a circle through the 5 pencildots, and measure the Ø (diameter) I get 122 mm,
not knowing how accurate this method is, it could be 120 mm. Which of these, if any, is a reel chainring
measure? I can only seem to find Ø130 mm, and Ø110 mm on my local webshops...

And if it is a real measure, is it so unusual that I will be searching high and low for a new ring?
I want to put on a new chain, and I do not want to ruin a new chain, with a worn chainring.

Thanks
Morten

http://www.sheldonbrown.com/gloss_bo-z.html#bcd

it's harder to find parts for older french bikes like peugeot, but there are NOS if you look around.

Pictures would help properly identify the crank, but given that it is a Peugeot and has 122mm BCD, I would guess the crank to be a Stronglight 93 or perhaps a Stronglight 105. It's a nice crank, but has been out of production for at least 20 years. Chainrings for this model (new and used) do turn up regularly on eBay.

http://www.velobase.com/CompImages/C...4964AB5B9.jpeg

Don't bother. Not readily available.

That crankset is trash, old french crap. Send it to me and buy yourself a nice new Sugino Messenger.

Yeah, it's a pain that stronglight used a proprietary size, but lurking on ebay turns up all kinds of things.

Shimano and Campag also used proprietary chainring sizes, they just got copied by more manufacturers than Stronglight.

Really? Just gotta keep your eyes open, check swap meets, etc. The Stronglight 93 was right up there with the Campy Record on high-end racing bikes, so there's a lot of them still kicking around.