Never seen this crank set up before. What the? How the?
03-01-23, 05:54 PM
#1
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Never seen this crank set up before. What the? How the?
03-01-23, 06:11 PM
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Perhaps it doesn't shift to the small ring (or if it does it isn't expected to go back)?
Just don't see it as viable
Just don't see it as viable
03-01-23, 06:16 PM
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Note the workmanlike day the Arx goes about in shifting that...it scoffs at a mere 25 tooth shift.
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03-01-23, 10:43 PM
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looks like it says Sugino AT on it, and looks from the back like it should be a half-step triple crankset which seems to be the case for the make/model but a quick image search didn't turn up a version this shiny.
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03-02-23, 12:17 AM
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Correct, they were sold anodized. On this one, someone has stripped the ano and polished it.
I bet the bike had not been ridden at all when this pic was taken, and as soon as they tried shifting it, they realized their mistake.
I bet the bike had not been ridden at all when this pic was taken, and as soon as they tried shifting it, they realized their mistake.
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03-02-23, 04:45 AM
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Wall-hanger?
03-02-23, 06:52 AM
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The Sugino AT is a really nice, versatile crank!
I've got one set up as a compact double, and this bike set up as a half-step-plus-granny...
The shift from the 46T middle ring down to the 26T does require a bit of care to not drop the chain entirely. I can't imagine that this is improved by skipping the middle ring entirely.
Steve in Peoria
I've got one set up as a compact double, and this bike set up as a half-step-plus-granny...
The shift from the 46T middle ring down to the 26T does require a bit of care to not drop the chain entirely. I can't imagine that this is improved by skipping the middle ring entirely.
Steve in Peoria
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03-02-23, 08:23 AM
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Maybe the mounting points for the missing center ring act as pins to lift the chain?
03-02-23, 08:51 AM
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This is what the back of the right crank looks like...
Steve in Peoria
03-02-23, 08:58 AM
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That looks OK to me. Leave it on the big ring and only go to the small one when you meet a steep hill with a heavy load. Not for racing but maybe better for touring than fooling with a triple. Not every drive train has to be perfect to work perfectly well.
em
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03-02-23, 08:59 AM
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Classic 'wide step'. I saw TAs and Stronglight 99s set up that way back in the day. Yeah, didn't work great.
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03-02-23, 09:59 AM
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Seems like a big ring with its own pins might improve the whole exercise.
03-02-23, 09:59 AM
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I've set up many bikes close to that. Certainly done 46-26 more than once. It requires a light hand shifting but learning how to ride your bike is an important skill that includes shifting!
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03-02-23, 11:45 AM
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03-02-23, 12:19 PM
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Has the owner done a write up to offer a first person account? I remember someone here has a double Cyclotouriste with a big jump on his yellow Woodrup, but I don't recall who that is.
03-02-23, 12:21 PM
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Just takes technique to do the shifts. This is where Friction Shifters Rule!
Kinda like down shifting in a 1957 Chevy Pickup...
Technique...
Kinda like down shifting in a 1957 Chevy Pickup...
Technique...
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03-02-23, 12:23 PM
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I have no trouble shifting this.
03-02-23, 12:40 PM
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My Raleigh Gran Tour has an SR Apex 86BCD crankset with 48/28 rings. Pretty much any FD will friction shift it (once used it with a DA 7400 setup) but the Shimano CX70 is my shift-O-weapon of choice.
That is an interesting ring setup in the first post, however. Never thought of trying to workout the spacing using just the big ring and the granny. Some research is required!
That is an interesting ring setup in the first post, however. Never thought of trying to workout the spacing using just the big ring and the granny. Some research is required!
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03-02-23, 12:53 PM
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My touring double is a 46-26. It's fine going 46 to 26 but is prone to shedding the chain outside the 46 on upshifts if there is any chain tension. Shifts with weight have to be very well timed. I've another bike with 48-36-24. On balance I find the triple better with middle ring most of the time and shifts that are more resilient, but it may just be that I need more practice.
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03-02-23, 02:17 PM
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I'm thinking there's a size range for the 74 bcd ring. The tooth radius needs to be smaller than the 110 bcd spider arms so the chain cant get trapped between the new wider out of spec ring spacing. I'm going to guess 30t would be the largest granny ring useable. Other wrinkle would be a 130/74 bcd triple with the same grannie ring on spacers set up. The ones I've seen have a shelf for the inner chainring, so some modification might be necessary.
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03-02-23, 03:28 PM
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Looks like it was supposed to be a triple and someone took the middle ring out and left the big ring on the outside. THere likely also should have been spacers under the granny ring if there were three rings, but removing the spacers might have put the two remaining rings close enough that it might almost shift as it is.
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03-02-23, 03:57 PM
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Maybe not so much these days...
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03-02-23, 05:18 PM
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I have no problem with the large difference in size between the two rings, what I'm complaining about is the chain gouging up the chainring bolts and the shelf for the missing middle ring. The "correct" way to do this is by putting the big ring in the middle position, leaving the outer position vacant. Or you can mount a pants guard / bash guard where the big ring is supposed to go. I put "correct" in scare-quotes because it's still not fully optimized IMHO, it has all the extra spindle length and Q-factor of a triple.
Yes I know not everyone minds a wide Q, some prefer it, I'm just talking about what I consider inelegant engineering. And nobody should care what I think! When it's your bike, you set it up however you like. Me, if I wanted a compact-double, I'd use a crank made to be that way, like a Stronglight 99, TA Cyclotouriste, many others.
On the other hand, "off-label" uses of parts, for other than how they were intended, often shows creativity and can even work better than the factory spec. I'm all for it,,, sometimes.
Mark B
Yes I know not everyone minds a wide Q, some prefer it, I'm just talking about what I consider inelegant engineering. And nobody should care what I think! When it's your bike, you set it up however you like. Me, if I wanted a compact-double, I'd use a crank made to be that way, like a Stronglight 99, TA Cyclotouriste, many others.
On the other hand, "off-label" uses of parts, for other than how they were intended, often shows creativity and can even work better than the factory spec. I'm all for it,,, sometimes.
Mark B
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03-02-23, 08:20 PM
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taking a closer look at the photos, I'm thinking that the owner might have used much thinner spacers to mount the small ring (there aren't any bosses for the small ring on the Sugino AT). Maybe even eliminated the spacers entirely??
This is what the back of the right crank looks like...
Steve in Peoria
This is what the back of the right crank looks like...
Steve in Peoria
I was looking at the '80s Campy Athena catalog the other day and was surprised to see that the front derailleur capacity was 18t chainring differential. So big jumps were built into even racing gear back then, so it isn't so surprising that the ARX double being used is handling the 20t jump.
03-03-23, 04:16 AM
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I have no problem with the large difference in size between the two rings, what I'm complaining about is the chain gouging up the chainring bolts and the shelf for the missing middle ring. The "correct" way to do this is by putting the big ring in the middle position, leaving the outer position vacant. Or you can mount a pants guard / bash guard where the big ring is supposed to go. I put "correct" in scare-quotes because it's still not fully optimized IMHO, it has all the extra spindle length and Q-factor of a triple.
Yes I know not everyone minds a wide Q, some prefer it, I'm just talking about what I consider inelegant engineering. And nobody should care what I think! When it's your bike, you set it up however you like. Me, if I wanted a compact-double, I'd use a crank made to be that way, like a Stronglight 99, TA Cyclotouriste, many others.
On the other hand, "off-label" uses of parts, for other than how they were intended, often shows creativity and can even work better than the factory spec. I'm all for it,,, sometimes.
Mark B
Yes I know not everyone minds a wide Q, some prefer it, I'm just talking about what I consider inelegant engineering. And nobody should care what I think! When it's your bike, you set it up however you like. Me, if I wanted a compact-double, I'd use a crank made to be that way, like a Stronglight 99, TA Cyclotouriste, many others.
On the other hand, "off-label" uses of parts, for other than how they were intended, often shows creativity and can even work better than the factory spec. I'm all for it,,, sometimes.
Mark B