Please tell me what type of tool I need to order to work on my '91 Trek 950's bottom.
08-08-15, 07:22 PM
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Please tell me what type of tool I need to order to work on my '91 Trek 950's bottom.
On my last couple 40+ mile rides I noticed a prenounced clunk getting louder and this evening turned around after 15 mins out as it was very apparent something was wrong. I finally traced it to the bottom bracket being loose, it has quite a bit of play. I have a fair amount of bike tools but not what's used to tighten this type.
Could someone post me a link and also tell me if there's anything I need to know when adjusting it? I assume I'll be pulling the crank arms as well, which will be no problem. Anyway - thanks!
Last edited by exmechanic89; 08-08-15 at 07:24 PM. Reason: Not sure what I did to the title of this thread, lol..
08-08-15, 07:30 PM
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A PARK BBT-22, BBT-32 or similar.
You'll also need a crank puller.
Park Tool BBT-22 Bottom Bracket Tool > Accessories > Tools > Bottom Bracket Tools | Jenson USA
https://jet.com/product/8458969cbd5148599ec5282f0a0777ec?jcmp=pla--ggl--sporting_goods_other--outdoor_recreation_cycling_other--.--.--.--.--.--2&code=PLA15&k_clickid=3e0314df-2d01-464d-8f0b-c8d54e0b0f9c&kpid=8458969cbd5148599ec5282f0a0777ec&gclid=CLaJ2YztmscCFQaVfgodn-oHog
https://www.jensonusa.com/Park-Tool-CWP-7-Crank-Puller
You'll also need a crank puller.
Park Tool BBT-22 Bottom Bracket Tool > Accessories > Tools > Bottom Bracket Tools | Jenson USA
https://jet.com/product/8458969cbd5148599ec5282f0a0777ec?jcmp=pla--ggl--sporting_goods_other--outdoor_recreation_cycling_other--.--.--.--.--.--2&code=PLA15&k_clickid=3e0314df-2d01-464d-8f0b-c8d54e0b0f9c&kpid=8458969cbd5148599ec5282f0a0777ec&gclid=CLaJ2YztmscCFQaVfgodn-oHog
https://www.jensonusa.com/Park-Tool-CWP-7-Crank-Puller
Last edited by Bill Kapaun; 08-08-15 at 07:35 PM.
08-08-15, 07:33 PM
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Looks like a Shimano sealed bottom bracket. It doesn't appear to be in very good condition. I'd bin it.
You need Park Tool part # BBT-2 or similar to remove and install the new BB. I don't think you will be able to tighten it.
You need Park Tool part # BBT-2 or similar to remove and install the new BB. I don't think you will be able to tighten it.
08-08-15, 07:50 PM
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Hey thanks for those quick replies, I'll order the park BB tool tonite. Oh and I already have a crank arm puller and know how to remove the arms.
So once I get that park tool, I take it the splined cups unscrew? Also does the non-drive side have left hand threads? And if the bearings and and spindle are shot, what might be a good replacement? Thanks!
So once I get that park tool, I take it the splined cups unscrew? Also does the non-drive side have left hand threads? And if the bearings and and spindle are shot, what might be a good replacement? Thanks!
08-08-15, 08:15 PM
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Hey thanks for those quick replies, I'll order the park BB tool tonite. Oh and I already have a crank arm puller and know how to remove the arms.
So once I get that park tool, I take it the splined cups unscrew? Also does the non-drive side have left hand threads? And if the bearings and and spindle are shot, what might be a good replacement? Thanks!
So once I get that park tool, I take it the splined cups unscrew? Also does the non-drive side have left hand threads? And if the bearings and and spindle are shot, what might be a good replacement? Thanks!
Drive side left-hand thread. (Clockwise to loosen)
Non-Drive side, regular right hand thread. (Counter-Clockwise to loosen)
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08-08-15, 08:17 PM
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Thanks for that info. Ok I ordered the tool, I think I found a replacement BB too. 
08-08-15, 09:01 PM
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I'd also suggest once you get the tool that you go to the hardware store and get a correct length bolt that fits in the end of the spindle with a washer to hold the tool in place while you break it loose. A '91 isn't likely to come out without a fight. I'd also start putting some penetrant on it now. Unless you know the spindle length and BB shell width I wouldn't order a new one until you have the old one out and can get the numbers off it or measure the existing. Because I've been there.
08-08-15, 09:09 PM
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I'd also suggest once you get the tool that you go to the hardware store and get a correct length bolt that fits in the end of the spindle with a washer to hold the tool in place while you break it loose. A '91 isn't likely to come out without a fight. I'd also start putting some penetrant on it now. Unless you know the spindle length and BB shell width I wouldn't order a new one until you have the old one out and can get the numbers off it or measure the existing. Because I've been there.
08-08-15, 09:44 PM
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Here's how I implement my retaining bolt-
08-09-15, 03:32 PM
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Great tutorial - thanks. I'm gonna remove the crank arms tonight, and will pick up a bolt tomorrow at a hardware store for the spindle so i can do the same set up you have. Bolting the tool on makes a lot of sense.
I've never worked on this type of BB, overhauled many of the older standard type with a lock ring and cups you that screw in, but have never done sealed cartridge types.
Btw I was thinking of bidding on this BB, what do you think?
Shimano Square Taper SEALED Bottom Bracket BB UN72 68x113 | eBay
I've never worked on this type of BB, overhauled many of the older standard type with a lock ring and cups you that screw in, but have never done sealed cartridge types.
Btw I was thinking of bidding on this BB, what do you think?
Shimano Square Taper SEALED Bottom Bracket BB UN72 68x113 | eBay
08-09-15, 03:58 PM
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It uses the less common 8X1MM thread, not the more common 8X1.25MM
08-09-15, 04:35 PM
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I think Bill is referring to the treads on the bolt so it will screw into the axle to hold the tool .
08-09-15, 05:42 PM
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08-09-15, 10:46 PM
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08-10-15, 12:27 AM
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Why would you want a used BB for $20.95 (15+5.95 shipping) when you can get the same NEW BB at amazon for $17.93 and free shipping?
[h=1]Shimano BB-UN55 Square taper Bottom Bracket[/h]
by Shimano
30 customer reviews
[HR][/HR] [TABLE="class: a-lineitem"]
[TR]
[TD="class: a-color-secondary a-size-base a-text-right a-nowrap"]List Price:[/TD]
[TD="class: a-span12 a-color-secondary a-size-base a-text-strike"]$25.99[/TD]
[/TR]
[TR]
[TD="class: a-color-secondary a-size-base a-text-right a-nowrap"]Price:[/TD]
[TD="class: a-span12"] $17.93 & FREE Shipping [/TD]
[/TR]
[TR]
[TD="class: a-color-secondary a-size-base a-text-right a-nowrap"]You Save:[/TD]
[TD="class: a-span12 a-color-price a-size-base"]$8.06 (31%) [/TD]
[/TR]
[/TABLE]
In Stock.
Ships from and sold by Bikewagon.
Amazon.com: Shimano BB-UN55 Square taper Bottom Bracket
[h=1]Shimano BB-UN55 Square taper Bottom Bracket[/h]
by Shimano
30 customer reviews
[HR][/HR] [TABLE="class: a-lineitem"]
[TR]
[TD="class: a-color-secondary a-size-base a-text-right a-nowrap"]List Price:[/TD]
[TD="class: a-span12 a-color-secondary a-size-base a-text-strike"]$25.99[/TD]
[/TR]
[TR]
[TD="class: a-color-secondary a-size-base a-text-right a-nowrap"]Price:[/TD]
[TD="class: a-span12"] $17.93 & FREE Shipping [/TD]
[/TR]
[TR]
[TD="class: a-color-secondary a-size-base a-text-right a-nowrap"]You Save:[/TD]
[TD="class: a-span12 a-color-price a-size-base"]$8.06 (31%) [/TD]
[/TR]
[/TABLE]
In Stock.
Ships from and sold by Bikewagon.
Amazon.com: Shimano BB-UN55 Square taper Bottom Bracket
Last edited by CycleryNorth81; 08-10-15 at 12:29 AM. Reason: added the word "new"
08-10-15, 05:00 PM
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The ebay one doesn't include the NDS cup. Your existing NDS cup may or may not be compatible, and may or may not come out in one piece.
08-10-15, 10:04 PM
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Thanks for the info, that's good enough for me - I'm skipping the eBay BB. On a side note as I was removing the crank arms today and the crank puller pulled the threads right out of the left arm. Ruined it of course. I'm gonna cut it off with a hacksaw and replace it with something similar in the same length. Not sure how it happened. I've pulled many crank arms and never had that happen. What a PITA this project has been so far, lol.
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