Ever see something like this?
#26
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#27
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Interesting about the too-much-torque theory.. aren't folks always warning against clamping a seatube when putting bike in a stand for fear of crushing the seat tube (ie. always use the seatpost). I can't imagine those workstands with the rubberised clamps would ever exert more psi on the tube than a 1/2" wide metal FD clamp.
#28
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Nope Shimano told me that they would replace it, but I would have to take it to an authorized dealer and the dealer would have to contact Shimano to get it replaced. Too much hassle for $15 part. In any case it’s already fixed.
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Jumping in late here, but I'm just about to install a Dura Ace Di2 FD-R9150 front derailleur on my gravel bike, and I noticed Shimano has actually updated their Dealer Manual (DM-R9150-08-ENG) to recommend YOU DO INSTALL the small metal stick on backup plate WITH THE BAND CLAMP ADAPTOR. I tried to post a picture here of page 42 of the DM but I haven't made 10 posts on BF yet so the admin. won't let me.
My question is does it actually fit? It seems there isn't enough room between the support bolt (with it fully backed out) and the band clamp to slip this part in? But I'm going to give it a try. Just wondering if anyone has installed it successfully this way (SM-AD91 band clamp WITH the small metal backup plate)? Makes sense that this would help address creating a stress riser on the aluminum band part.
Thx!
Patrick
My question is does it actually fit? It seems there isn't enough room between the support bolt (with it fully backed out) and the band clamp to slip this part in? But I'm going to give it a try. Just wondering if anyone has installed it successfully this way (SM-AD91 band clamp WITH the small metal backup plate)? Makes sense that this would help address creating a stress riser on the aluminum band part.
Thx!
Patrick
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Okay, I just tried to install the FD-R9150 with the small metal backup plate stuck onto the band adapter, with the metal part on the centerline of the support bolt, the adhesive portions trailing (towards the rear of bike) and it definitely doesn't fit. When I try to fully tighten the FD onto the band clamp, there's noticeable interference between the body of FD and backup plate, and there's no way I can get the desired 0.5-1.0 mm of trailing edge clearance as shown on page 43 of the DM, even w/ the support bolt backed all the way out. I going to try to cut a small much thinner piece of stainless steel sheet stock with my tin snips and put it on with a thin piece of FSA tape.
#31
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Okay, I just tried to install the FD-R9150 with the small metal backup plate stuck onto the band adapter, with the metal part on the centerline of the support bolt, the adhesive portions trailing (towards the rear of bike) and it definitely doesn't fit. When I try to fully tighten the FD onto the band clamp, there's noticeable interference between the body of FD and backup plate, and there's no way I can get the desired 0.5-1.0 mm of trailing edge clearance as shown on page 43 of the DM, even w/ the support bolt backed all the way out. I going to try to cut a small much thinner piece of stainless steel sheet stock with my tin snips and put it on with a thin piece of FSA tape.
BTW, IIRC Shimano's instructions say to set the FD tail-in by a mm or so, and preload that support bolt enough to move it back out. Might sound a bit dicey to some, but makes sense for rigidity.
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
#32
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What am I missing here?
Since there was no front shift (or even rear shift?) then the chainring must have deflected a lot to snag the FD-
shouldn't this be considered along with the pot-metal theories?
Since there was no front shift (or even rear shift?) then the chainring must have deflected a lot to snag the FD-
shouldn't this be considered along with the pot-metal theories?