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Upgrading a 4 speed {HELP**

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Upgrading a 4 speed {HELP**

Old 05-31-17, 08:35 AM
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CPower
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Upgrading a 4 speed {HELP**

Hi all,

Bought a Peugeot racer, not sure on the model but around '86, and I love it. However, it only has 4 gears and I am thinking of upgrading it to at least 7, and then implement a triple chainring to make it 21 gears. However, I've a strong feeling, just by eyeing up the rear cassette, that a 7 speed cassette won't fit. Is there anyway I can maybe widen the frame or something? Thanks
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Old 05-31-17, 09:21 AM
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Freewheel? hub french threaded? they are a Cul de Sac, standards thread and tube diameters left behind by now,

your plan can be accomplished.. But it wont be low cost. quite the opposite.

yes people widen steel frames .. See: "cold setting" on Sheldon brown's site.




....
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Old 05-31-17, 09:47 AM
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It sounds that is is an old bike if it has 4 speeds, like 50's which along with it being french would complicated upgrades. it would best to post a picture and you might want to take this to C&V forum (but be prepared for some push back on modernizing a truly old bike)
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Old 06-03-17, 02:38 PM
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Originally Posted by fietsbob View Post
Freewheel? hub french threaded? they are a Cul de Sac, standards thread and tube diameters left behind by now,

your plan can be accomplished.. But it wont be low cost. quite the opposite.

yes people widen steel frames .. See: "cold setting" on Sheldon brown's site.




....

Thanks for the reply. It is British threaded BB. Popped into the bike shop earlier and a new looking lad said that i shouldnt bother. Not too sure what to do as i will most likely brake it if i cold set it myself. Thanks.
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Old 06-03-17, 02:39 PM
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Originally Posted by squirtdad View Post
It sounds that is is an old bike if it has 4 speeds, like 50's which along with it being french would complicated upgrades. it would best to post a picture and you might want to take this to C&V forum (but be prepared for some push back on modernizing a truly old bike)

Thanks for the reply. I cant date it specifically but its around mid 80s as it has an english BB
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Old 06-03-17, 07:53 PM
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Originally Posted by CPower View Post
Thanks for the reply. I cant date it specifically but its around mid 80s as it has an english BB
Okay, there's been some monkey business going on. A Peugeot racing bike of that era would have come with two chainwheels and a 6 speed freewheel. Most likely a Maillard helicomatic.

It also would have brazed on shifter bosses.

Pictures are really needed here.
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Old 06-04-17, 07:41 AM
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4-speed freewheels haven't been made for probably 50 years. Your bike is much older than you think. Your BB may be a Swiss style.
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Old 06-04-17, 07:45 AM
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Id put an Internally geared hub rear wheel in , if I were you.. (its all I use, any more)
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Old 06-04-17, 10:34 AM
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Originally Posted by Ronsonic View Post
Okay, there's been some monkey business going on. A Peugeot racing bike of that era would have come with two chainwheels and a 6 speed freewheel. Most likely a Maillard helicomatic.

It also would have brazed on shifter bosses.

Pictures are really needed here.
Will do. Im not 100% sure its 4 speed but thats what it came with. Its a single speed but i feel i may as well just keep it that way for now.
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Old 06-04-17, 11:01 AM
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There you go , single speed is fine as long as you like that gear ratio.
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Old 06-04-17, 05:18 PM
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Originally Posted by CPower View Post
Will do. Im not 100% sure its 4 speed but thats what it came with. Its a single speed but i feel i may as well just keep it that way for now.
First you said it was a 4 speed, then you say that you don't know how many speeds, now you say it's a single speed. Which is it? Until you can get your story straight, I don't think anybody will give you a valid answer, because you don't even know what the question is.

Just post some pics, since you don't know what you have, and save us having to make wild guesses on contradictory information.
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Old 06-04-17, 07:32 PM
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Originally Posted by CPower View Post
Will do. Im not 100% sure its 4 speed but thats what it came with. Its a single speed but i feel i may as well just keep it that way for now.
Yeah, someone did some sort of single-speed conversion and (I'll bet) just bodged together whatever spacers and a few cogs to get a chainline.
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Old 06-05-17, 06:53 AM
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Somebody did sell a four speed derailer, drop handlebar bike in the 1970's. One neighbor had one. Sorry I can't recall anything about it. Was more like a trainer jet, for future multispeed bike owners. In the bike boom era, almost anything on two wheels was selling. Cheers guys
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