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Interchangability of Stronglight triple vs. Ofmega Triple

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Interchangability of Stronglight triple vs. Ofmega Triple

Old 05-03-15, 07:15 AM
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Interchangability of Stronglight triple vs. Ofmega Triple

I am considering swapping out an Ofmega triple 54/48/30 for a Stronglight 50/45/28. My question is will the Stronglight crank set fit directly on the Ofmega spindle or will it require finding a lot of new (old) parts? I can find 52/42 rings for the Ofmega, which might be an easier solution. I was thinking about turning the bike into a randonneur touring bike and keeping the components sort of French as the bike has a Sachs rear derailleur. The bike is an early J.P. Weigle I found on CL in the Nags Head, NC.

Thanks, Jeff
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Old 05-03-15, 07:53 AM
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I took a look in Sutherlands, 6th ed. to see if this swap is referenced, but the best I could find is the note that "Ofmega taper ends are smaller than others and not interchangeable" (3-14). That does not bode well for what you want to do.
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Old 05-03-15, 08:02 AM
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One thing to keep in mind is how difficult or easy it is to find chainrings for your crank. I don't know which model of stronglight crank you have but most are not easy to find chainrings for and they require a special tool to remove them. The ofmega triples I think had a 144 bcd for the outer two and 74 bcd on the inner (actually it looks as if there are different sizes that can fit but one is 74 bcd): VeloBase.com - Component: Ofmega CX (triple)

You can find chain rings for either size. I'd stick with the ofmega for that reason (availability of chain rings and you have a bottom bracket that works). If I were going to change, I'd get a sugino triple with 110/74 bcd as that will give you, I think, better gear ratios to work with and sealed bottom square taper bottom brackets for that crank are easy to find.
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Old 05-03-15, 09:21 AM
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Really funny this pops up.

I got a really nice Stronglight 99BIS from @bikemig a while ago, and it works great and looks lovely on the bike it's on- So when I decided to triple-ize a bike- I got another Stronglight 99BIS- the inner rings were way too worn.

I got an Avocet Triple (with matching BB) that is in GREAT shape (it's the same crank as the Ofmega, but rebranded for Avocet) , but I kind of stumbled on another Stronglight 99BIS... So now I have two gloriously awesome triple cranksets (and one overly worn one) and now I get to choose. To make it more difficult, I ran across two drilled, matching 144 BCD rings for the Avocet, so they kind of have that BIS look to them...

As far as the Stronglight- there's two different models of the 99 (if that's the one you've got)- the one with the fluted spider arms takes a regular crank puller.

So, as far as what should the OP do...

First- congratulations on scoring the Weigle- that's a "grail" bike for many.

Second... I would hunt down the rings- and hunt down drilled rings- they'll go really swell with the drillings on the spider arms of the Ofmega. You don't have to worry about scoring more hardware- other than the rings.






The RINO rings are NOS. I'm planning on removing the anodizing on the rings, as well as the the clear anodizing on the Avocet-

If anyone wants a NOS set of red drilled and milled rings and has a set of 52/42 not colored drilled rings... let me know before I go to town on these guys.
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Last edited by The Golden Boy; 05-03-15 at 09:25 AM.
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