What am I doing wrong: SRAM GXP crank install

[FastforaSlowGuy]

It has been a while since I’ve used a SRAM crank. I’m installing a new crank set on a new to me frame. Installed the GXP Hawk bottom bracket per instructions with a spacer on each side. But the non-drive side spindle is not making solid contact with the NDS bearing, so the crank is wobbly. I thought about taking spacers out, but the other issue I’m running into is that the section of spindle with the splines on it appears to be protruding too much for the amount of space in the NDS crank arm. So if I take the spacers out so the bearings are in better contact, I think I would have too much spindle exposed.
https://uploads.tapatalk-cdn.com/20200829/6c578f41ff940fdcc2b48ccb938902eb.jpg


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[jtbadge]

Doesn't look like the NDS bearing cap is correct. It should have cutouts for to match the splines on the crank spindle.

Are you sure you're using a GXP BB? The NDS should only have 22mm bearings. Looks like you're using a BB for Shimano 24mm straight spindles.

EDIT:
I looked at the PDF for their SRAM kit. Seems like an awful lot of unnecessary complication: https://www.hawk-racing.com/wp-content/uploads/2018/02/SRAM-Kit-V2-Instruction-Manual-ENG-v1.pdf It does say the shims go on the crank spindle and not between the BB cups and frame.

Installation of a SRAM BB is brainless, I would just get one of those and be done with it.

[robt57]

Show direct pic NDS, why did you put a washer behind that cup? Is there one on the DS by chance?

[FastforaSlowGuy]

When test fit on the crank the NDS bearing fits fine. And the NDS cup won’t fit over the DS, so it certainly seems right. I’ll check the box. Maybe I’m missing an insert or something.


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[FastforaSlowGuy]

https://uploads.tapatalk-cdn.com/20200829/5a5ea71477e248f59a01952f09a93d76.jpg
Seems like I’m missing an insert of some sort.

Edit: Checked again and the bearings are definitely right. But then I checked the packing slip, and the price on the invoice is for the Shimano version, not the SRAM version, whereas my email invoice definitely has the sram version specified. So maybe I’m not crazy and something was shipped wrong. Ugh. Really wanted to get this bike on the road this weekend.

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[robt57]

The one ITA GXP I did did not have the spacer/seal with the splines on the ID.

Again, why the spacers? The wavy washers should make up that space at the axle if that is why you put them there, I think...


I re-read the OP paying a little better attention.

On my BSA installs, the spacer with the spine on the ID and the wavy washer on the NDS covers the little bit of spline that passed out of the bearing NDS..

I can say the ITA GXP BB in the parts drawer, I did not like anything about it when I fit it as I recall. I do have GXP on BSA on 2 bikes and it also works great on BB90 with the NDS 22mm ID bearing.

Side note: In fact removing the actual GXP BB out of the equation on the BB90 removes the weight hit the threaded GXP BB adds to [IMO] an otherwise great system.

[FastforaSlowGuy]

No wavy washers with this BB. Just three spacers. Two 0.5 mm and that appears to be 1mm. Instructions (which aren’t great said fat washer goes on the NDS, and thin one goes on DS. But it’s been at least 8 yrs since I’ve used a GXP crank, so I have no idea what it’s supposed to look like.


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[jtbadge]

These instructions say only a .5mm spacer on each BB cup.

https://www.hawk-racing.com/wp-content/uploads/2018/08/BB-Installation-Guide-ENG.pdf

Then I linked above how the GXP adapter kit (which is apparently missing) is to be installed

[robt57]

So what is the chain line looking like, and does it bind when you torque on the NDS arm?

So if the NDS is not seating well enough and allowing tilting in use... I'd wanna see the chainline measured without any spacer on the DS cup. And I might lean toward no cup shims NDS and add a wave washer. But as I said my ITA one I gave up on.

[FastforaSlowGuy]

Haven’t checked chain line. I was following the video instructions. The written instructions linked are for Shimano setups. I’ll think they just didn’t ship an insert. I’m annoyed.

https://youtu.be/At-w1PMF3Ko


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[robt57]

Just like saddle setback is always first for fit. Checking the chainline is first for me.

If you sort out the NDS and get chain drops because it has 3-4mm too much, you will wish you had established it sooner. Just my opinionated 2 cents. ;) Rule it out.

[Ed-B]

That really looks like a Shimano bottom bracket cup...

[Mark McM]

Haven’t checked chain line. I was following the video instructions. The written instructions linked are for Shimano setups. I’ll think they just didn’t ship an insert. I’m annoyed.

https://youtu.be/At-w1PMF3Ko


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If you mean the insert (in the video) that is inserted into the NDS bearing from inner side of the bearing, yes, this is absolutely necessary.

The instruction .pdf that was linked in someone else's post is a completely different SRAM adapter. The adapter kit in the video is a perfectly valid way to adapt a Shimano BB to GXP, and is similar to what other manufacturers do. On the other hand, the V2 adapter kit in the .pdf is a total kluge. I have no idea why Hawk came out with the V2 adapter.