Sometimes I act before I think.
03-12-20, 07:59 PM
#1
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Sometimes I act before I think.
I’m getting some parts together for a future build. I picked up a Shimano RSX crankset today, while cleaning it I noticed the teeth were screwed up. So without any research I ordered 2 chainrings. So, I’m relaxing in my recliner doing what I should’ve done earlier, researching the crankset. So the chainrings are suppose to look like that. I looked closer at the two I just ordered, and yep they are the same. No one told me about this, and I’ve never owned RSX anything. I guess it doesn’t hurt to have extras. I’m a very impulsive person.
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03-12-20, 08:13 PM
#2
señor miembro
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Cancel before it ships.
03-12-20, 10:11 PM
#3
feros ferio
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Been there ... done that. I bought my Schwinn with a 38T Biopace middle ring, for which I sought round 40T replacement. I looked at the new Shimano unit at the bike shop, and the sales guy and I puzzled momentarily over the deformed teeth before simultaneously reaching the "aha -- it's supposed to be like that" realization.
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
03-12-20, 10:53 PM
#4
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Yup, they match up with pins that are a couple teeth ahead, the pins catch first, then the small teeth and the chain is shifted. Worked pretty good but had to explain to a lot of people these were normal. Usually MTB riders noticed it more.
03-13-20, 04:06 AM
#5
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Yup, I met a CL lister to inspect his 95 Trek 850. Shifters gummed up and teeth on the chain rings all wacked - teeth here and there ground down way more than others. "Your kids have been ramming this thing over rocks! I'll have to replace those. Expensive." I sounded so authoritative as I was SO ignorant. I bought it anyway.
Weeks later I discover the idea of the teeth being intentionally shaped that way to improve shifting. I actually called the guy back to apologize to his kids. Boy I felt dumb. Now I work at an LBS and get to gently explain those teeth to folks sometimes.
That Trek 850 has been "dropped" and I ride it regularly. Those wacked teeth work great.
Weeks later I discover the idea of the teeth being intentionally shaped that way to improve shifting. I actually called the guy back to apologize to his kids. Boy I felt dumb. Now I work at an LBS and get to gently explain those teeth to folks sometimes.
That Trek 850 has been "dropped" and I ride it regularly. Those wacked teeth work great.
03-13-20, 05:44 AM
#6
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Great front shifting on the RSX stuff, seems to shift very well under full load. Kind of a heavy crankset, but that shifting is really phenomenal.
03-13-20, 06:21 AM
#7
Mr. Anachronism
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It's not just the RSX. Note the teeth at 2:00 and 6:00 on this FSA Gossamer crank. I had the same thoughts/epiphany.
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03-13-20, 12:08 PM
#8
Senior Member
Yup, I met a CL lister to inspect his 95 Trek 850. Shifters gummed up and teeth on the chain rings all wacked - teeth here and there ground down way more than others. "Your kids have been ramming this thing over rocks! I'll have to replace those. Expensive." I sounded so authoritative as I was SO ignorant. I bought it anyway.
Weeks later I discover the idea of the teeth being intentionally shaped that way to improve shifting. I actually called the guy back to apologize to his kids. Boy I felt dumb. Now I work at an LBS and get to gently explain those teeth to folks sometimes.
That Trek 850 has been "dropped" and I ride it regularly. Those wacked teeth work great.
Weeks later I discover the idea of the teeth being intentionally shaped that way to improve shifting. I actually called the guy back to apologize to his kids. Boy I felt dumb. Now I work at an LBS and get to gently explain those teeth to folks sometimes.
That Trek 850 has been "dropped" and I ride it regularly. Those wacked teeth work great.
He bought the bike anyway.
03-13-20, 03:53 PM
#9
Ride, Wrench, Swap, Race
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Yup, I met a CL lister to inspect his 95 Trek 850. Shifters gummed up and teeth on the chain rings all wacked - teeth here and there ground down way more than others. "Your kids have been ramming this thing over rocks! I'll have to replace those. Expensive." I sounded so authoritative as I was SO ignorant. I bought it anyway.
Weeks later I discover the idea of the teeth being intentionally shaped that way to improve shifting. I actually called the guy back to apologize to his kids. Boy I felt dumb. Now I work at an LBS and get to gently explain those teeth to folks sometimes...
Weeks later I discover the idea of the teeth being intentionally shaped that way to improve shifting. I actually called the guy back to apologize to his kids. Boy I felt dumb. Now I work at an LBS and get to gently explain those teeth to folks sometimes...
Turned out there were other serious issues with the bike, related to this guy's own willy-nilly parts-swapping.
I admonished him to appreciate that the kids had gotten enough real use out of the bike to break the axle, and swapped his wheel for a stronger one with the correct number of sprockets.
Bike repair gets pretty hilarious to the point that I will occasionally entertain a bike's owner with a sing-song o'er-the-top narrative of how the bike might really have come to have all of it's mechanical maladies.
Last edited by dddd; 03-13-20 at 03:57 PM.
