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New member Jim Merz

Old 05-07-23, 05:14 PM
  #51  
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Originally Posted by bulgie
no bolt head at all on the top of the quill, just blank there.
Right, so you get at it from the underside of the steerer tube?
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Old 05-07-23, 05:23 PM
  #52  
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Originally Posted by bulgie
Nice! Highlights, for those who couldn't tell from the pics:
  • no bolt head at all on the top of the quill, just blank there.....
wow!
I hadn't really noticed Jim's phrase "tapered threaded cone" until Mark's comment.
holy cow! I can't imagine what sort of setup is required to do that!

Steve in Peoria
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Old 05-07-23, 05:31 PM
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Wait, how do you tighten the cone expander bolt? 😳

Originally Posted by Portlandjim
This is all I have for photos. I would not do the tapered thread cone again. It's not that practical, it take a lot of torque to tighten.




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Old 05-07-23, 05:32 PM
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Originally Posted by P!N20
Right, so you get at it from the underside of the steerer tube?
Ohhhhh!
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Old 05-07-23, 06:01 PM
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Welcome to C&V, Jim.
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Old 05-07-23, 07:37 PM
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Jim's presentation at the 2013 Cirque Du Cyclisme.
biciak: 2013 Cirque Du Cyclisme Presentations
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Old 05-07-23, 08:03 PM
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Originally Posted by P!N20
Right, so you get at it from the underside of the steerer tube?
Yes. And I should have said no bolt rather than "no bolt head". The total lack of a bolt is noteworthy, even though Jim has said he wouldn't do it that way again, it's just friggin awesome. The cone itself is threaded on the outside, with a mating thread on the ID of the quill tube. The cone is hollow (with allen-key socket) where the bolt would normally go. Hard to beat that for lightness.

Also noteworthy: the stem is home-made! Well he didn't chrome plate it himself, but the rest was made at his house, I believe (Jim correct me if I'm wrong there). Not bad for a hobbyist! Total amateur, in the sense that he did it for love, not money.

I can only hope to be that much of an amateur when I grow up.

Last edited by bulgie; 05-07-23 at 08:07 PM.
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Old 05-08-23, 07:53 AM
  #58  
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Those stems make me want to buy something to use one on.
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Old 05-08-23, 09:34 AM
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Jim may not be too interested in the Clunker Challenge, if it ever gets revived. No Campa on those Huffy's.
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Old 05-08-23, 09:48 AM
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Originally Posted by Wildwood
Jim may not be too interested in the Clunker Challenge, if it ever gets revived.
"On the Road Again" Challenges
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Old 02-11-24, 07:40 PM
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Question - do you still make chainrings?

I知 looking for a 31t 74 bcd ring.
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Old 02-11-24, 09:03 PM
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Welcome.

for the record they claim everyone has a brush with fame, I may earmark this as mine.
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Old 02-11-24, 09:20 PM
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31 tooth chainring

Originally Posted by Jockdeboer
I知 looking for a 31t 74 bcd ring.
I made Merz 31 tooth chainrings with a 100mm BCD, that was way back when I was building frames in Portland. I don't have any of them that arn't on a bike, so can't supply one. Plus, you asked for one with a 74BCD. Isn't that the BCD that Avocet triples used? I never made them in that mounting size. Jim Merz
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Old 02-11-24, 09:52 PM
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Originally Posted by Jockdeboer
I知 looking for a 31t 74 bcd ring.
31? That's odd...
You might have to settle for one only 96.8% as large. Or spend some time in the weight room until you can turn over a gear that's 3.2% bigger.

Ooh I know, take a 32t ring and break one tooth off.
No need to thank me!
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Old 02-11-24, 10:00 PM
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Originally Posted by Portlandjim
I made Merz 31 tooth chainrings with a 100mm BCD, that was way back when I was building frames in Portland. I don't have any of them that arn't on a bike, so can't supply one. Plus, you asked for one with a 74BCD. Isn't that the BCD that Avocet triples used? I never made them in that mounting size. Jim Merz
thanks Jim. I have a 165 Strada triple coming. It is drilled for 100 & 74.
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Old 02-11-24, 10:24 PM
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Originally Posted by Jockdeboer
thanks Jim. I have a 165 Strada triple coming. It is drilled for 100 & 74.
Would you be interested in a how-to on making your own? Problem is you need a "donor" ring with the teeth already machined, and I don't know of any in 31t — other than the ones Jim made in the '70s that is.

I've made a couple 30t rings to fit the 100 mm BCD, by starting with a 74 mm BCD ring, which are common. Drill 5 new holes, and cut the original holes off (optional). I've even made one in 29t, but 29t "donor" rings are quite rare.
30t is the smallest that is really practical though. The 29t has some compromises that many people wouldn't want to live with. 30t is practical, works with regular bolts and any chain.

My Flickr album showing how I made mine.

I didn't even have a drill press when I made this, my only power tool was a hand drill. It would be easier and maybe safer to do it on a drill press. I did have a set of transfer punches though, which you might have to buy. But they can be found cheaply, and they're very good to have in your shop if you're a tinkerer.

Making prrofessional-looking counterbores, for the head of the bolt to sit flush, requires you to spend a little money on the tool, but I actually did mine with just a twist drill. So my counterbore has a slightly conical bottom to it instead of a proper flat bottom, but it works 100% in every way I can detect. Now I have the proper counterbore tool, but I didn't back when these photos were taken.

More advice available if anyone is interested, but I imagine this is a pretty niche enterprise! Please PM me if interested so we don't hijack Jim's thread any more.

Mark B
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Old 02-12-24, 12:08 PM
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Just now realizing I failed to live up to my rep.

Way past due here.






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Old 02-12-24, 12:38 PM
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Originally Posted by Portlandjim
I made Merz 31 tooth chainrings with a 100mm BCD, that was way back when I was building frames in Portland. I don't have any of them that arn't on a bike, so can't supply one. Plus, you asked for one with a 74BCD. Isn't that the BCD that Avocet triples used? I never made them in that mounting size. Jim Merz
Yes, Avocet triples actually were drilled and tapped for two different BCDs: 74mm, which is still pretty common, and 102mm, which AFAIK is unique to Ofmega.
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Old 02-12-24, 12:57 PM
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A little late to the game, but wanted to welcome Mr. Merz to the Forum!! Welcome Portlandjim! I was just gifted a 1986 Specialized Allez SE Jim Merz. Should be a fun restoration project this spring. I'll post pics once it's all done. Great to have you here!

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