I Own One! (41t 144 BCD Ring)
08-15-24, 09:34 PM
#1
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I Own One! (41t 144 BCD Ring)
I was just looking at an Aero Mighty crankset that I was going to offer here for just shipping. Came on a Pro Miyata. I only run 175s and 144 doubles are of limited use to me outside fix gear. "Mighty", ie Sugino hadn't clicked yet and I was searching for manufacturer clues. Saw the 52 and 41 on the chainrings. 41!!! Looked again. 41. OMG. Here in my hand is the first (fully mythical) 41 tooth chainring I have ever knowingly laid eyes on. I've known of them since at least 1977. Know a fellow with two. But held it in my hands? And irt's mine??!!
I didn't count the teeth. (Could be a practical joke. Stamp those digits on and watch Ben wet his pants.) But that ring of aluminum (just one, Campy SR style) is skinny! Just counted. Yup, 41.
And I looked at the Campy triple I put on my Pro Miyata. 135 BCD. Surprise to me but I like. I've moved my other bikes to 50-38-24. I always assumed this, being Campy, was 144. My knees like! I measured the inner ring BCD and got 74! Thank you, Campagnolo! (Just ordered a 39t. Got a stack of 74 BCD 24s. I'll keep the 52 to go with the 13 on my 13-26 Sedis 7-speed FW so I have a little high end.)
I didn't count the teeth. (Could be a practical joke. Stamp those digits on and watch Ben wet his pants.) But that ring of aluminum (just one, Campy SR style) is skinny! Just counted. Yup, 41.
And I looked at the Campy triple I put on my Pro Miyata. 135 BCD. Surprise to me but I like. I've moved my other bikes to 50-38-24. I always assumed this, being Campy, was 144. My knees like! I measured the inner ring BCD and got 74! Thank you, Campagnolo! (Just ordered a 39t. Got a stack of 74 BCD 24s. I'll keep the 52 to go with the 13 on my 13-26 Sedis 7-speed FW so I have a little high end.)
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08-15-24, 09:44 PM
#2
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-----
OFMEGA has produced a great many 41T 144's
have been available for decades, at least since the mid-1970's
nothing rare or special about them
------
OFMEGA has produced a great many 41T 144's
have been available for decades, at least since the mid-1970's
nothing rare or special about them
------
08-15-24, 10:13 PM
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Hmmm. Then why is it that after years of looking I've never laid eyes on one? Also, I own an Ofmega crankset and it has a 42.
I strongly suggest that 79Mooney get out into a field and start looking for four leaf clovers. With your kind of luck you're bound to find one, or more.
I strongly suggest that 79Mooney get out into a field and start looking for four leaf clovers. With your kind of luck you're bound to find one, or more.
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08-15-24, 10:13 PM
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08-15-24, 11:04 PM
#5
blahblahblah chrome moly
Campy, AFAIK, only made them in old-Record ("NR") style, with the extra "web" between the bolt holes, never in Super Record style. Anyone know different?
TA made, maybe still makes, a very nice 144 - 41t in SR style, arguably nicer looking than a real Campy ring.
EDIT: ah here we go, Peter White lists the TA 41t for sale here: https://www.peterwhitecycles.com/tach.php#competition. Call him to see if they're in stock.
I've seen maybe one or two other brands that look like the SR shape, but they aren't Campy.
I have an interesting one, dunno who made it, that doesn't use chainring nuts, rather the holes are threaded so the chainring bolt screws right into the ring:
Even rarer, I have a 144 mm BCD ring in 39t. The pic proves it:
That ring was sold to me by a reputable C&V dealer long ago, early internet era. He had an email newsletter with a list of vintage parts for sale, no pictures just text, and this was listed as being in "good" condition. He quickly gave me my money back when I sent him a pic showing the hooked teeth, so I won't embarrass him by naming him here. Oh and it came with 42 teeth, the 3 missing here were removed by me as a joke.
I just don't want you to think I actually rode a bike with a chainring in this condition.
TA made, maybe still makes, a very nice 144 - 41t in SR style, arguably nicer looking than a real Campy ring.
EDIT: ah here we go, Peter White lists the TA 41t for sale here: https://www.peterwhitecycles.com/tach.php#competition. Call him to see if they're in stock.
I've seen maybe one or two other brands that look like the SR shape, but they aren't Campy.
I have an interesting one, dunno who made it, that doesn't use chainring nuts, rather the holes are threaded so the chainring bolt screws right into the ring:
Even rarer, I have a 144 mm BCD ring in 39t. The pic proves it:
That ring was sold to me by a reputable C&V dealer long ago, early internet era. He had an email newsletter with a list of vintage parts for sale, no pictures just text, and this was listed as being in "good" condition. He quickly gave me my money back when I sent him a pic showing the hooked teeth, so I won't embarrass him by naming him here. Oh and it came with 42 teeth, the 3 missing here were removed by me as a joke.
I just don't want you to think I actually rode a bike with a chainring in this condition.
Last edited by bulgie; 08-15-24 at 11:07 PM.
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08-16-24, 06:42 AM
#6
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I have a few 41 x 144 BCD rings . The most recent was a new set of chain rings purchased from Greg at Cyclomondo that were Colnago Panto 53/41 .
08-16-24, 08:10 AM
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08-16-24, 08:19 AM
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Interesting twist. If you had a second, "conventional" 41T, you could determine if that attachment is "x" grams lighter than the usual holes plus five backing nuts. You'd think this would be common -- then again, that's threads in aluminum, and not particularly thick at that.
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08-16-24, 08:45 AM
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So...what's the real-world difference that one tooth would make? I looked at some charts and it seems like a fairly small increment?
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08-16-24, 09:21 AM
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08-16-24, 01:00 PM
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08-16-24, 01:29 PM
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That's easy. When 42 t is simply hard!!!, 41 is 2.5% less hard. There was a time when 144 BCD was universal in the racing world. FWs had 5 cogs. That 2.5% could be a real gift. (I rode FWs that gave me the cogs to not get dropped. 13,14,15,17,19. Many hills, that 2.5% would have been quite nice!)
Last edited by 79pmooney; 08-16-24 at 01:30 PM. Reason: End pararenthisis
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08-16-24, 02:41 PM
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08-16-24, 05:12 PM
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Ofmega, TA, and Campagnolo all made 41T, 144mm BCD rings. The Campagnolo ones were only made in the "Record" style, with the reinforcing web. They may not be "rare," but neither are they common. One problem with a 41T ring on a 144mm BCD crank is that the chain can hit the ends of the spider arms on the crank. Ofmega thoughtfully machined away a little material from the inside edge of the spider arms to provide a little more clearance for the chain.
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08-16-24, 07:12 PM
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Originally Posted by 79pmooney
13,14,15,17,19. Many hills, that 2.5% would have been quite nice!)
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08-17-24, 08:35 AM
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I looked for one in vain when I set up my Avocet (Ofmega) triple.
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08-17-24, 11:26 AM
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An 8-tooth drop in front works well with 14-16-18-20-23-26 in back (been there ... done that). 49-41 instead of the 50-42 I used for many years before switching to 130mm BCD and 46-38 would indeed have given me 2.5% more leverage on ascents.
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08-17-24, 11:50 PM
#22
blahblahblah chrome moly
Here's what the bolt holes would look like at 144 mm on a 39t ring:
40t is possible, sort of, with some serious downsides (I have done it), but 39 is just outside the realm of possibility.
08-18-24, 09:17 AM
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Hope you don't mind me asking, what's your evidence that those are 144 mm BCD rings in the pics? I see strong evidence that they're 135 mm, namely the fact that 39t is not possible on 144.
40t is possible, sort of, with some serious downsides (I have done it), but 39 is just outside the realm of possibility.
40t is possible, sort of, with some serious downsides (I have done it), but 39 is just outside the realm of possibility.
