SRAM preload install on BB30 Red crank
01-26-19, 05:31 PM
#1
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SRAM preload install on BB30 Red crank
Hi all,
So a red 22 crank taken off a canondale came only with a wavy washer on the NDS and some plastic spacers on the DS
I'm installing this crank on my Focus which needs the preload adjuster (and I don't think it uses the wavy washer or plastic spacers).
I got the adjuster and it comes with a little thin black spacer. Do I need to use that on this crank or is that spacer for different cranks? My Apex cranks have a recess to hold that spacer so it makes sense there, but the Red cranks don't have that recess for the spacer.
I just want to make sure i'm installing this adjuster correctly.
Correct me if I'm wrong, but I'm also assuming I need to de-grease the spindle thoroughly so the adjuster can grip properly.
So a red 22 crank taken off a canondale came only with a wavy washer on the NDS and some plastic spacers on the DS
I'm installing this crank on my Focus which needs the preload adjuster (and I don't think it uses the wavy washer or plastic spacers).
I got the adjuster and it comes with a little thin black spacer. Do I need to use that on this crank or is that spacer for different cranks? My Apex cranks have a recess to hold that spacer so it makes sense there, but the Red cranks don't have that recess for the spacer.
I just want to make sure i'm installing this adjuster correctly.
Correct me if I'm wrong, but I'm also assuming I need to de-grease the spindle thoroughly so the adjuster can grip properly.
Last edited by DaMaDo; 01-26-19 at 06:47 PM.
01-26-19, 10:17 PM
#2
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The adjuster replaces the wavy wasker. It basically serves the same purpose. Mine is on Cannondale CAAD10 with satndard BB30 shell (68mm). I dont use any spacers. I do grease the spindle but after I slide the adjuster arm on. With the set screw tightened, I have not had any issues with the adjuster moving.
01-27-19, 03:21 PM
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The adjuster replaces the wavy wasker. It basically serves the same purpose. Mine is on Cannondale CAAD10 with satndard BB30 shell (68mm). I dont use any spacers. I do grease the spindle but after I slide the adjuster arm on. With the set screw tightened, I have not had any issues with the adjuster moving.
I won't use the wavy silver washer, but the adjuster comes with a very thin flat black metal washer. That's the one I'm uncertain about. On my Apex crank it was on the outer side of the adjuster up against the crank arm.
01-27-19, 04:42 PM
#4
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Description sounds like the metal cover for my BB30 bearings. If you have something like that covering the bearing face, you probably dont need it.
01-27-19, 04:46 PM
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If you google "SRAM crank adjuster" you'll see the washer that comes with the adjuster.
01-27-19, 06:20 PM
#6
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No, my bearing cover isn't flat (has a flange), and it's on the inside. This flat washer was on the outside of the adjuster. Wish I could post a pic, but don't have the post count yet.
If you google "SRAM crank adjuster" you'll see the washer that comes with the adjuster.
If you google "SRAM crank adjuster" you'll see the washer that comes with the adjuster.
01-27-19, 08:49 PM
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01-28-19, 03:14 AM
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FWIW I have a Red BB30 that I installed myself and there isn't any spacer or shim in it. The plastic piece rides against the crank arm. When you turn it, the threads cause the metal piece to move inwards (the "+" direction) against the bearing race. That metal piece needs to be able to slide on the spindle. If you loosen the screw too much (or the metal piece can't slide) the plastic adjuster will "jump" over the thread and not push the metal piece inwards. I suppose if the metal piece was too loose on the spindle it could spin with the adjuster which of course would result in it not working right.
scott s.
.
scott s.
.
01-28-19, 05:49 AM
#9
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FWIW I have a Red BB30 that I installed myself and there isn't any spacer or shim in it. The plastic piece rides against the crank arm. When you turn it, the threads cause the metal piece to move inwards (the "+" direction) against the bearing race. That metal piece needs to be able to slide on the spindle. If you loosen the screw too much (or the metal piece can't slide) the plastic adjuster will "jump" over the thread and not push the metal piece inwards. I suppose if the metal piece was too loose on the spindle it could spin with the adjuster which of course would result in it not working right.
scott s.
.
scott s.
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01-29-19, 06:05 PM
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Why does the Focus require the preload adjuster?
I've installed a Red bb30 in a friends Chinese Carbon bike using the wavy washer for preload, and on my own bike I replaced the Rival bb30 crank with the adjuster, for a Force with wavy washer.
I've installed a Red bb30 in a friends Chinese Carbon bike using the wavy washer for preload, and on my own bike I replaced the Rival bb30 crank with the adjuster, for a Force with wavy washer.
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01-29-19, 10:00 PM
#11
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I think it serves same purpose so you could probably use wavy washer and adjuster interchangeably. The adjuster supposedly makes it easier to get preload right. I have never usd a wavy washer so don’t know about that.
01-31-19, 07:47 PM
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Without the preload adjuster, the focus paralane would need around a 9mm spacer.
I found SRAM's manual and it looks like the flat shim that the preload adjuster comes with is not used on the Red 22 crankset.
I found SRAM's manual and it looks like the flat shim that the preload adjuster comes with is not used on the Red 22 crankset.
