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External BB Sindle Stuck - Odd Metal RIng

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External BB Sindle Stuck - Odd Metal RIng

Old 10-14-08, 09:51 PM
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External BB Sindle Stuck - Odd Metal RIng

Question regarding a Truativ (GXP) BB that is original stock on my 2006 Trek Portland (triple Bontrager crank set).

Due to a creak I wanted to tighten down the BB cups. That required me to remove the crank set. Non-drive side crank came off – no problem – went to get the one-piece spindle and drive side crank out/off and it was tight as can be. So I tapped it with a rubber mallet – nothing - tapped it harder and harder and using various wood blocks and dowels and a mini-sledge, etc. I eventually freed the spindle, but had to drive it every cm along the way.

Once I got it out I pulled the drive side bearings and found a second cup/metal ring inside it - sitting inside the cup - it had been between the inside tube/cover and the bearing face. The second cup has an inside diameter (21 mm) that is 2 mm smaller than the 23 mm spindle it s supposed to fit over. That is apparently why I had to drive the spindle out – it was extremely tightly pressed onto the spindle and with each whack the spindle was SLOWLY sliding through the metal ring. It seems as though it must have been machine pressed over the spindle, but that would mean they machine-pressed it with the bearing cup included, and then screwed the bearing cup on with the spindle attached - unusual.

Bottom line is: (1) it was very difficult to take the drive side crank out; (2) it definitely will not go back together; (3) nobody seems to understand why the ring would have been there in the first place.

I am attempting to attach some photos of the parts. One picture shows the ring sitting on the spindle – it will only go part of the way down the splined/tapered end of the spindle. Note the wear ring around the base of the spindle where the ring used to sit.

Anybody ever find one of these in their BB?

Any idea what its use is, and why it was next to impossible to remove?
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Old 04-17-17, 10:19 PM
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Great question with no answer

Man I've been searching all day with this exact problem. Of course I find a 9 year old post with no answers.

I just took aprt a 2007 Trek 5000 triple chain ring crankset and it was worse than pulling teeth. It turns out this exact same ring is stuck to my non drive side spindle shaft and required removal of both bearing cups to fully remove the crankset. However, now this ring is preventing the center tube and drive side bearing cup from slipping off of the whole spindle shaft. Essentially I now have a bottom bracket that is not serviceable from the drive side. Wtf Bontrager/Trek/Truvativ?!?
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Old 04-18-17, 05:00 PM
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A GXP BB is 24 mm on the drive side and 21 mm on the non-drive side. Some aftermarket BBs use a 24 mm Shimano type BB with a reducer sleeve in the non-drive side.
Likely the crank was installed without grease on the shaft or it's been in there a long time. That sleeve will need to be removed and then maybe a new BB. If you get the sleeve off in one piece then use lots of grease to reassemble.
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Old 04-19-17, 02:42 AM
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Thanks for the response! I just got a gear puller from the auto parts store to see if I can get it out. No luck so far since the little sleeve is beveled on the end where the jaws grip on. My next solution is to "borrow" a bearing cup seperator from the store and see if that has a better contact area. It'd be a shame to toss this bb if I could salvage it, this bike has very low mileage.

Originally Posted by Slash5 View Post
A GXP BB is 24 mm on the drive side and 21 mm on the non-drive side. Some aftermarket BBs use a 24 mm Shimano type BB with a reducer sleeve in the non-drive side.
Likely the crank was installed without grease on the shaft or it's been in there a long time. That sleeve will need to be removed and then maybe a new BB. If you get the sleeve off in one piece then use lots of grease to reassemble.
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Old 04-19-17, 06:16 AM
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Originally Posted by Slash5 View Post
A GXP BB is 24 mm on the drive side and 21 mm on the non-drive side. Some aftermarket BBs use a 24 mm Shimano type BB with a reducer sleeve in the non-drive side.
Likely the crank was installed without grease on the shaft or it's been in there a long time. That sleeve will need to be removed and then maybe a new BB. If you get the sleeve off in one piece then use lots of grease to reassemble.
Exactly this. Hope make their bottom bracket to fit Shimano's 24mm spindle and separately sell a reducing ring set as you have to convert the non drive side to GXP. The rings should remain on the bearing when the spindle is removed.
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Old 04-19-17, 08:38 AM
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Remove the adaptor sleeve (24 to 22mm) using whatever method you choose without damaging the crank spindle. Replace the BB with one using a 22m id bearing specifically for GXP cranks, not a sleeved Shimano bottom bracket size. SRAM/Truvativ GXP BBs are available all day for less than $30.


I wouldn't bother with a puller. I'd split the sleeve with a chisel.
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Old 04-19-17, 05:40 PM
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At $30 I might do just that. Time for some careful cutting.

Originally Posted by reddog3 View Post
Remove the adaptor sleeve (24 to 22mm) using whatever method you choose without damaging the crank spindle. Replace the BB with one using a 22m id bearing specifically for GXP cranks, not a sleeved Shimano bottom bracket size. SRAM/Truvativ GXP BBs are available all day for less than $30.


I wouldn't bother with a puller. I'd split the sleeve with a chisel.
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Old 04-19-17, 05:43 PM
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I think I'll walk around with the crankset spindle from store to store to find the right fit lol

Originally Posted by patrickf View Post
Exactly this. Hope make their bottom bracket to fit Shimano's 24mm spindle and separately sell a reducing ring set as you have to convert the non drive side to GXP. The rings should remain on the bearing when the spindle is removed.
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Old 04-23-17, 08:05 PM
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The deed is done. After the most careful Dremeling I've ever done, I was able to remove the ring and go fit the spindle to a new bottom bracket for $35. Thanks for the help everyone!
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