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What chainrings can I source for this Stronglight crankset?

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What chainrings can I source for this Stronglight crankset?

Old 01-19-14, 12:04 PM
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What chainrings can I source for this Stronglight crankset?

I have a useful Stronglight crankset, please see the picture, below. I like this crank and will keep it. Is it possible to change the chanrings to a 46 & 30 combination?

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Old 01-19-14, 02:05 PM
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That's a model 100 crank, same 86mm BCD as the venerable mod. 99, so it can handle as small as a 28T ring. Assuming you can find both a 46T and a 30T ring, what you propose is "do-able." In my experience, 45T rings are fairly easy to come by, as they were popular in 50-45-28 "half-step plus granny" set-ups in the 1980s. Sakae Ringyo also made an 86mm BCD crank, so those rings will also work for you. One caveat, though: I've only seen the Sakae Ringyo 45T ring available as a "middle" or "inner" ring, counter-bored to receive the chainring bolt on the inside. While you can turn it around to mount as an outer ring, there is a ramp under the teeth and the teeth are slightly offset on what was intended to be the inside, and the resulting spacing makes for very poor shifting onto the 45T ring when it is mounted backwards as an outer. Shifting is much better with the ramp on the inside, as intended, but then the chainring bolts will stand slightly proud of the ring face.
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Old 01-19-14, 02:13 PM
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Thanks John,

Thanks', that really helps. A 45 & 28 or 30 would be great. Does anyone stock these, or should I focus on eBay?
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Old 01-19-14, 02:46 PM
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I have some new-old-stock SR chainrings in 38t
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Old 01-19-14, 02:58 PM
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The bolt circle standard was not chosen to be continued, unlike 110-74..
in which case you would have one on each bolt circle .. middle and inner ..

Might be more economical to start with a different crank than seek our a couple Rare Chainrings

An Issue I've seen with those .. is the chain jams in-between the 2 ..

and the mounting bolts, at 86,mm, being so close to the center, they Pry apart relatively easily..
and the chain is stuck fast and the chainrings bent.

Velo Orange likes the 46-30 combo and gets them made for their store as such.
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Old 01-19-14, 07:18 PM
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Spa Cycles in the UK sells Stronglight chainrings. They offer the following on the website;

STRONGLIGHT 86 BCD Dural 46, 47 (15 Pound)
STRONGLIGHT 86 BCD Zicral 28, 30, 34 (15 Pound)
STRONGLIGHT 86 BCD Dural 32 (10 Pound)

Will all of these fit?
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Old 01-20-14, 06:32 AM
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Originally Posted by Barrettscv
Spa Cycles in the UK sells Stronglight chainrings. They offer the following on the website;

STRONGLIGHT 86 BCD Dural 46, 47 (15 Pound)
STRONGLIGHT 86 BCD Zicral 28, 30, 34 (15 Pound)
STRONGLIGHT 86 BCD Dural 32 (10 Pound)

Will all of these fit?
They should fit--I bought the same 46 and a 30 from Spa Cycles a couple of years ago and they work great. I have mine set up with a custom 13-15-18-22-26-34 freewheel--the old-guy wide-range double. I had a useful email exchange there with a very helpful guy named John (sales@spacycles.co.uk). You might want to confirm this, but as I recall only the zicral rings have counterbored holes so the bolt heads sit flush. The cheaper and shorter-lived dural rings--which were what I got because that was all they had in my sizes--aren't counterbored. That's not really noticeable once they're installed, but it does mean that you need slightly longer chainring bolts, which can involve some trial and error. I ended up having a local machine shop counterbore the rings for me which cost more than the rings themselves--in retrospect not a very cost-effective solution.
Incidentally, before I went to Spa Cycles I had gone directly to Stronglight to ask about 86 BCD rings and was told in no uncertain terms that the company no longer made them. I asked John at Spa how they happened to still have the no-longer-made rings. Were they left-over old stock or what? He said that Stronglight does make rings for them (that is, for Spa Cycles), but only in batches of 100 at a time, so they don't always have all rings in all sizes. But I'm glad someone has them.
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