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phreaky Shimano chainring

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phreaky Shimano chainring

Old 06-13-15, 04:43 PM
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rattinox
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phreaky Shimano chainring

I'm finally getting my Ancient and Venerable 93 Rockhopper up to my specs. Good investment; I use the bike when doing spotter work for the National Weather Service, so reliability is Numba One.......

One thing that must be replaced ASAP is my middle chainring, a Shimano SX F-36 (tooth), that has both pickup pins and ramps. The previous owner (I picked it up in a pawnshop for $100) was apparently lacking in skill adjusting shifters and/or derailleurs, 'cuz the thing has just been chewed (see pic)

I have never seen this combination of ramps and pickup pins on any other chainring old or modern. NONE of the current manufacturers have this configuration, or even close.

The pickup pins are more like plates, and the ramping is substantial.

After 2 weeks of net search, I found a few 110mm BCD x 36T that have pins, but no ramping; one is a RaceFace, the other a SRAM.

Any other suggestions? I have to replace it soon........
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Old 06-13-15, 04:54 PM
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...just replace it with a 36 tooth chainring with the correct bolt pattern and diameter. I don't see the problem ?
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Old 06-13-15, 05:03 PM
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That's the way the ramps used to be. They are now further improved, therefor look different. Just by a Shimano ring with the same tooth count and bolt circle diameter.
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Old 06-13-15, 05:29 PM
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Originally Posted by Wolf Dust View Post
That's the way the ramps used to be. They are now further improved, therefor look different. Just by a Shimano ring with the same tooth count and bolt circle diameter.
Ding! Thread: done.

The cheaper Shimano rings were built this way: flat, stamped aluminum with riveted pick-up ramps. More expensive rings had machined ramps.

Wolf: I haz cats.
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Old 06-13-15, 08:37 PM
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[QUOTE=Jeff Wills;17891687]Ding! Thread: done.

The cheaper Shimano rings were built this way: flat, stamped aluminum with riveted pick-up ramps. More expensive rings had machined ramps.

Wolf: I haz cats.

Aaah, cats iz goodz! Check out this video on YouTube: cat enjoying a warm winter day bike ride...sorry I'm too dumb to know how to post the video.
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Old 06-13-15, 08:42 PM
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The important designation that guarantees an exact fit and performance is "F-36".

"F" is the series to which all three rings should belong for best shifting. Shimano's cranksets have long been noted for the very best in shifting performance.

Middle rings often take the most wear of the three, and I believe that F-series rings may be long out of production.

The F-series ring set was as good as it gets for use with 7 and 8s chain, and subsequent to the introduction of 9s chain there were never again such good 7-8s chainrings made.

There were later cranksets designed for use with 9s chain that used these same ratios, so would be compatible with your existing front derailer.

9s chain will also work perfectly with your 7 or 8s cassette if you decide to simply replace your crankset, should one become available at whatever is a good price for you.

Often an entire crankset (or an entire bike) can be had for the price of a new high-quality chainring, so this is my preferred method of parts procurement.

Any Shimano parts dealer can check on availability and price of the F-36 chainring, and it may even still be available in more than one quality level, but most shops don't bother because the parts are somewhat more expensive or because they routinely make large orders of parts from preferred distributors.
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Old 06-13-15, 09:34 PM
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Originally Posted by Wolf Dust View Post
Aaah, cats iz goodz! Check out this video on YouTube: cat enjoying a warm winter day bike ride...sorry I'm too dumb to know how to post the video.
Ah, thread drift... My guys were named on the Foo forum.


Not bike, but what the heck:

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Old 06-14-15, 12:54 AM
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^^^^Awsome, and thanks! Some of those clips had me laughing so hard I almost pooped my pants!

*Probably better change the name of this thread to: phreaky catz

BTW, welcome to bikeforums rattinox!
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Old 06-14-15, 06:34 AM
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Originally Posted by 3alarmer View Post
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...just replace it with a 36 tooth chainring with the correct bolt pattern and diameter. I don't see the problem ?
This. You're WAY overthinking the problem. In this application, 110 BCD is 110BCD.

Stop by your LBS. Bring Beer. As to look in the takeoff/junk bin. Find a 34-36 tooth 110BCD ring. Leave with said ring after sub $10 negotiated price (possibly free due to beer). You may even leave with a whole crankset with rings.
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Old 06-14-15, 06:45 AM
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Thanks to all for the info. Indeed, shifting with this old crankset is beautiful......snick-click-click-click, clean and precise, just like a Ferrari transmission. A joy to ride and a wonder to behold.

Think I'll go for the FSA 36T; it'll be well hidden behind the 46t outer ring. Can't allow new technology to disrupt the Old School vibe, now can we?

All hail the ancient and awesome Lord Shimano
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