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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 05-04-06, 11:18 AM   #1
frogge
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Help with PX-10 crank and chain rings

Hey,
I've converted my 1970 Peugeot Px-10 to fixed gear. Everything is cool except the venerable 45 stronglight chain ring is not up to fixed gear abuse. I'd really like to put different cranks on it and run a 1/8 chain. Is there any crankset that is compatable with the stronglight bb spindle( I believe it has a Stronglight 93 spindle and crank). Thanks in advance,Frogge.
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Old 05-04-06, 01:46 PM   #2
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oh boy. you are going to get it. PX-10 being converted. tisk tisk.
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Old 05-04-06, 02:06 PM   #3
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I just converted a mid-to-late 1970's Gitane with a french Stronglite BB. I have an early 1980's Campy crank on it now w/o problems. Frankly, I have not seen much from before 1983-85 which wouldn't 'fit', but if you start mixing and matching track cranks with doubles, your spindle length will likely become a problem. Campy, Suntour, and Shimano started getting cute after that trying to out-pace each other in the technology game, and simply came up with a bunch of different stuff which isn;t any better (IMHO), but isn't as interchangable (and p*ssed me off in the meantime).

I will eventually go with a track crank and deal with the spindle issues then. I am told that it should not be much of an issue if I have to change spindles so long as I verify the sizing. I have seen some Phil Wood cartridge BB's whihc have lock rings to fit in older bikes (i.e. french, italian threading). This is probably your best bet if you are going with a true single chainring crank as you can get the spindle length you need when you arder it.
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Old 05-04-06, 02:12 PM   #4
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Defense

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Originally Posted by jamey
oh boy. you are going to get it. PX-10 being converted. tisk tisk.
Jamey,
I've owned this bike for over thirty years. I've ridden the original wheels with sew ups on dirt roads in Pennsylvania and cobblestones in Belgium. My wife put the original simplex derailleur through the spokes over twenty years ago. I've commuted on it for more than twenty years. Converting it to fixie has allowed me to continue to enjoy this bike. I'm not sentimental about the parts I've taken off. If anyone wants the original handlebars, stem, and brakes, I'll give them away,just pay the shipping. You can also have the 52 tooth chain ring, Stronglight cranks and 45 tooth chain ring if I can solve the above problem. I'll also throw in the original simplex front derailleur. Toodles,frogge.
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Old 05-04-06, 03:58 PM   #5
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i'm pretty sure your stronglight spindle is that crazy campagnolo-type. So your standard japanese parts won't fit, even though they are also square tapered. it's a different kind of square taper. So you could go with campy. Or go with a 5-series japanese tapered spindle. A 5-series will say 5N, 5P, stuff like that. Most standard spindles are 3-series (3N, 3T, etc). You need this different one because the bearing races are 2mm further apart, otherwise your bottom bracket lockring won't fit right.

and yes, i would love your px-10 stem. So much so that I'll PM you about it too.
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Old 05-04-06, 06:00 PM   #6
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Nah, nah... just buy the Sugino french cups from Harris, take out the SL cups, stick on the Suginos, and find an acceptable older Japanese crank and spindle with a more common BCD (like say, 130). That'll avoid having to find the old "five" Japanese spindle, plus give you more chairing options, as the 122 SL BCD is getting uncommon. Be sure to crank the fixed cup on tight!

Not all Campy will work; some Campy cups are thick walled, where the SLs are thin walled; so the Campy spindles won't always work with SL cups. Vintage Campy and SL spindles are different. The cups and axles aren't really compatible (although you can mix 'em in a pinch), and there is a difference in the taper as well. Vintage TA spindles will work w/ SL cranks (exact match), and vintage Sugino Maxy, but for the Maxy you'll need different cups. For reference, check a period Sutherland's Handbook for Bicycle Mechanics.

There isn't anything wrong with converting a PX. They're so braze-on free that you don't have to hack anything off. I own three of them (1967,1972,1973, with the 73 a conversion). Easy enough to take back to standard, so what's the issue?
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