Ignorant newbie basic question re compatibility

[Ajoten]

Have just acquired an 1978 Peugeot with such a mish-mash of components I reckon the previous owner refused to put 2 items of the same brand on the frame.

I intend to gradually replace all the bits with ones of the correct brand and vintage, but having got in a right tangle trying to put together a mongrel modern bike am all too aware of potential compatibility pitfalls and throwing money away.

For example, are all late 70s/early 80s quill stems likely to be interchangeable? Will any pedal fit any crank? Are there different seatpost/handlebar diameters?

And so on. Expect lots of similar questions in the ensuing months and years...

Andrew.

 

[legrandefromage]

stems should be the same as long as the original isnt marked 21.1mm

bar sizes I think vary from 25.4 to 26mm

there will be loads of different seatpost sizes - best see what is written on the original and that the fit is ok

pedal threads will depend on the parts, you have the very common standard fit, then theres French and Italian thread sizes which can sometimes be difficult to source parts from.

rather than me waffle on, try this site for 'how to'

http://sheldonbrown.com/glossary.html

and this site for 'what have I got/ do I need'

http://velobase.com/Default.aspx

 

[one-eyed_jim]

stems should be the same as long as the original isnt marked 21.1mm

... unless it's a French 22.0mm quill.

bar sizes I think vary from 25.4 to 26mm

... unless it's a French 23.5 or 25mm bar!

Again, Sheldon (may his memory be blessed) is an excellent source of information on French standards:

http://www.sheldonbrown.com/velos.html

A Peugeot of that era is likely to have a full set of metric threads, but the best thing to do first is to measure to be sure of what you have. A good Vernier caliper will pay for itself many times over.

 

[legrandefromage]

Gawd, never met those weirder sizes yet.

 

[one-eyed_jim]

Gawd, never met those weirder sizes yet.

Bienvenue en France!

http://www.eBay.fr is a good source of older French parts, but buying remotely can be a minefield. Not all parts are marked with their dimensions, many French manufacturers were producing parts in different standards for the domestic and export markets, and not all sellers are aware that their local standards are not universal.

 

[legrandefromage]

exactly!

 

[Jonny69]

Aye, doesn't that age Peugeot have a 22mm quill and 25mm bars? Or were they all conventional 22.2 and 25.4 by then?

 

[legrandefromage]

Mine was actually quite normal with 22.2 stem, English threads and a 27 or 27.2 post

try

http://cyclespeugeot.com/PDFs/1978pdf.pdf

http://cyclespeugeot.com/Catalogs.html

 

[anagrama]

As you may have gathered, 70's Pugs can be a bit of a minefield. If it's Carbolite, you can expect an awkward-bastard seatpost size too.
They often have the model number on a white sticker under the BB or chainstay, which would help pin it down..

 

[Ajoten]

Re:

It's had a respray so no sticker remains - I'm making an uneducated guess that based on...

• 7 digit serial number starting with 8
• 531 frame
• Simplex dropouts
• Likelihood of a PX10 dropping into my lap

it's something like a PKN10 that was on the shelf 1979-81. None of the components are original so they can't help me identify.

I can imagine asking someone "do these widgets you're selling have French threads?" and they'll respond "I don't know" and I won't know how to proceed.

Doesn't help that fork will dictate stem will dictate bars and I can't gradually install bits and keep it rideable.