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Ultegra triple ring ass'y. - Mercy!(12 posts)

Ultegra triple ring ass'y. - Mercy!Crankist
Nov 25, 2001 9:43 AM
Does anyone have figures on the number of man-hours Shimano devoted to making this re-assembly
nearly impossible? What twisted if not perverted personality quirk was behind the decision to make the length of the retainer nuts for the med. & large chainrings exceed the gap between them? Is there any frustration sicker than one which could cause a person to string three rhetorical questions together?
This ass'y. took a full hour. Find me standing in front of an engine lathe tomorrow facing off 1/16" length,
spitting messy gobs in the direction of certain Japanese "engineers" .
End of Rant,
re: Ultegra triple ring ass'y. - Mercy!TJeanloz
Nov 25, 2001 11:20 AM
Are you sure you have all the right parts in the right places? I've swapped rings a bunch of times, on several different Ultegra cranksets, and never had this problem.
re: Ultegra triple ring ass'y. - Mercy!Crankist
Nov 25, 2001 4:21 PM
Good! Something this simple should never be a problem. However I re-assembled exactly as found. My best guess solution would be that the small ring could possibly be clocked on the crank so that the gaps between the teeth allow clearance for the retainer nuts which fasten the middle and large rings - and that LBS or factory got it wrong. Or my set of retainers are too long (which is unlikely). Otherwise well, see original post.
re: Ultegra triple ring ass'y. - Mercy!Crankist
Nov 25, 2001 4:28 PM
Oops posted too soon: another thought is to remove the small chainring to install the other two, and then re-install the small one - just a dumb arrangement.
leave it ......ask around ....go back afreshdupe
Nov 26, 2001 5:02 AM
i dont have any experience with your triple assembly.

but i have had a left crank arm that was botched (i thought) by a lbs. they have a great rep and couldnt understand why they mutilated it when fitting it. luckily it didnt fail at high speed and i wsnt harmed.

at one point i had the lbs, internet wholesaler, crankset manufacturer and b/bracket manufacturer all pointing fingers at each other as to who is at blame.

turns out that the maker of the bottom bracket revised the width of the b/bracket splines from 2.1 to 2.2, the internet seller had an older set of these cranks that escaped being recalled, the crank manufacturer sent out a new left crank arm and both the bike store and myself are still wondering why the right crank-arm fit perfectly.

sometimes you may not be at fault. sometimes you could be unearthing a design fault that customer service reps avoid acknowledging. some parts may escape quality control or without perfect tolerances.

if its to the point that you have to get frustrated and have to machine bits just to get them to fit start asking questions. it might unveil something.

good luck.

ciao, ben
Take a Deep Breathgrzy
Nov 26, 2001 9:11 AM
It's not that hard with the RIGHT tools. You need the special wrench for the chainring bolts.
Take a Deep BreathCrankist
Nov 27, 2001 7:02 AM
(oxygen tent resident): Special Allen wrench? I had no problems fastening when the fasteners were in place.
Say more.
Take a Deep Breathgrzy
Nov 27, 2001 11:07 AM
Not a special Allen wrench, but rather a special wrench for holding the slotted nut thingy that it threads into. You start trying to tighten the Allen wrench and the special nuts want to spin. The tool is a silly little stamped out thing, but it's hard to torque the Allen bolts w/out one. Cost is maybe $6 - more if you get it from Campy - way more.... ;-)
Nov 27, 2001 6:43 PM
re: Ultegra triple ring ass'y.Chen2
Nov 27, 2001 7:09 AM
Reversed rings a possibility? The tooth count stamping for the big ring should face right (away from the frame). The stampings on the other two rings face left (toward the frame).
re: Ultegra triple ring ass'y.Crankist
Nov 27, 2001 6:46 PM
Thanks for the thought, but no. It appears that the solution is to uninstall/re-install sm. chainring or trim length of retainer nuts.
Slow Downgrzy
Nov 28, 2001 3:42 PM
Something isn't right if you're thinking that the solution is to trim the retainer nuts. Shimano engineers don't screw up this badly (at least not that often). You probably have the wrong parts or swapped them around - you're working on a triple correct? I've rebuilt these things many times and hardly ever have any parts left cars are a different story.