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Is this part critical????

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Is this part critical????

Old 07-08-09, 11:41 PM
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Neccros
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Is this part critical????

I'm fed up with trying to fix/replace my 9 speed Brifter and decide to go 10 speed (got a smoking deal)

Now I got some used Ultegra cranks, and these will be my first "external" bottom bracket type cranks... Now im missing the small plate that I circled in the picture and I was wondering, Is this a critical part???

Thanks!

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Old 07-08-09, 11:56 PM
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Hmmm, I say no.
I've got using 3 sets of Dura-Ace cranks without it, and 1 set of Ultegra.

I suspect it's just to stop gunk getting in there.
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Old 07-08-09, 11:58 PM
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Hmmm OK... It seems like a plate to prevent over torquing of the crank bolts but wasn't sure...
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Old 07-09-09, 12:04 AM
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Yeah, it may be, but I'm confident I can torque them properly (I've done it dozens of times), and I'd hate to think it would prevent enough torque. There have been plenty of cases of the left arm coming off during riding, which is why they now come with the warning sticker, saying something like: "check pinch after the first ride"

However, I could be wrong
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Old 07-09-09, 12:12 AM
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Nah. You don't need it. The reason you don't have one is because the earlier Ultegra cranks didn't have one. They added them later. This was in response to people having their crank arm come off because of improper installation/torque and not rechecking it.

Once torqued in place the plate is pinched and the pin it has protrudes into the spindle of the crank to help prevent it from sliding off the end of the spindle if torque ends up too low.

Just install and torque correctly. In abot 100 miles check the torque on the pinch bolts again. Then you should be OK.
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Old 07-09-09, 12:14 AM
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Ok... I just need to strip my bike of all the 9 speed stuff and prep it for the new stuff....
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Old 07-09-09, 12:16 AM
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Make sure to do up the two pinch bolts alternately, bit by bit, not one in all the way, then the other.
And don't do the end cap up too tightly (that's done first); it's meant to be done by hand.
It the end cap is too tight, it could cause undue bearing wear and create drag
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Old 07-09-09, 08:04 AM
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yep, it's a bit harder to judge how hard you screw in the preload cap to the cranks.
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