Questions tagged [threaded-bottom-bracket]
The threaded-bottom-bracket tag has no usage guidance.
19 questions
8
votes
2
answers
248
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Another very stuck bottom-bracket – non-standard size (37 mm flats)
my name is Alex and I’m new here. I’m a bit of an amateur but I’ve decided to attempt the modernization of an old French Liberia racer from 1978. The aim is to create a bike I can use as a daily ...
- 131
7
votes
4
answers
9k
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Drive side part of bottom bracket is impossible to remove and has destroyed tool fitting
So my old cartridge bottom bracket is about fall apart and i bought a UN55 to replace it. The plastic non-drive side was very easy to remove, but the drive side is literally impossible. I let it soak ...
7
votes
4
answers
907
views
Square taper bottom bracket lock ring: grease, loctite, or both?
I removed the square taper bottom bracket on my bike today to regrease the threads to see if they're the culprit for an annoying creak I've been hearing while pedaling.
I can see that the outer 50% of ...
- 4,339
6
votes
2
answers
1k
views
Removing a 1970s Schwinn Bottom Bracket
I am restoring a 1970 Schwinn Suburban and I am at a loss when it comes to removing this bottom bracket. The crank arms do not come off normally (no way to use a crank puller) and they won’t unscrew. ...
- 141
6
votes
3
answers
900
views
Broken plastic HollowTech II BB spacers, why?
Yesterday I was installing a BB-MT501 HollowTech II bottom bracket into my ~2006 Trek 520 frame. This frame has a 68mm BB shell.
I was following the directions on Shimano's website: https://si.shimano....
- 193
5
votes
2
answers
371
views
Threadlock for Bottom bracket on Titanium Frame?
I'm looking into installing a bottom bracket for my titanium bike frame. The bottom
bracket that I purchased (SHIMANO ULTEGRA Threaded Bottom Bracket 68/70 mm shell width) seems to have some kind of ...
- 151
5
votes
1
answer
109
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FSA Mega Exo 24 threaded shell BB turns free when off the bike, but turns rough and gritty once installed
My FSA Mega Exo BB is about 2 years old and came on the bike when I bought it new. The right-side bearing is fine. However, the left-side bearing is gritty and resistant when installed in the frame, ...
- 153
4
votes
3
answers
473
views
What's causing the clicking on my ProWheel MPX 11 crankset?
New fatbikes have a ProWheel MPX 11 crankset 1x (hollowtech ii compatible set) and I get moderate clicking from mine, oddly, to my mind, not just when under power, but with less vigorous spindle ...
user36575
3
votes
2
answers
2k
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I crossthreaded the bike frame using force on the BB. Can still be saved?
I have a MTB, with "normal" square taper BB, and a 3 chainring crankset from Shimano.
After some problems with my pedals, I managed to destroy the fillet on the crank arms too and in the end ...
- 31
3
votes
1
answer
104
views
Request for clarification of bottom bracket threading
I know that bottom brackets have a left-hand thread on the right side, and a right-hand thread on the left side.
But I fail to understand why.
I would have thought it should be the other way round, to ...
- 1,797
3
votes
1
answer
71
views
Crankset specs for 2013 gt backwoods sport
I have a 2013-2014 GT Backwoods sport 27.5 bike that needs a crankset replacement.
I removed today the crankset and see that the crankset has splines that seem to match the splines that are part of ...
- 33
2
votes
1
answer
320
views
Shimano BB: add grease over threadlock?
The dealer manual for the Shimano BBR60 bottom bracket says to grease the threads of the cups before inserting. But I noticed that the threads have some kind of grey threadlock compound applied to ...
2
votes
2
answers
2k
views
What is the difference between Shimano SM-BBR60 and Shimano BB-MT501
Are these 2 bottom brackets compatible? Is one 'better' than the other? Is one more durable than the other, more efficient than the other?
I would guess that the BB-MT501 is meant for dirtier ...
- 705
2
votes
1
answer
214
views
Bottom bracket for 1991 raleigh classic man
Got a Raleigh classic man from a scrap shop. Decided to give it a life. The frame is in good condition and managed to get bearing hubs for front and rear wheels. I was wondering what would size and ...
- 312
1
vote
1
answer
86
views
Are 68mm and 73mm bottom bracket left side cups identical?
My MTB has a 73mm bottom bracket shell but it had 68mm BB installed. I found and purchased a Shimano BB-ES300 73mm BB but unfortunately I had to break apart its plastic cup (left side) since I ...
- 2,168
1
vote
1
answer
105
views
Heavy corrosion of the bottom bracket shell, but rest of the frame is fine
I have a Btwin MyBike cycle, which is now 8 years old. The frame is an steel alloy.
I want to replace the bottom bracket, chrank shafts & chain ring.
The BB was very difficult to remove, used a ...
- 165
1
vote
0
answers
78
views
Play in Quarq power meter on a Trek emonda
I am currently installing a Quarq d four power meter on my ‘22 Trek emonda and have been having some issues. I purchased the sram dub t47 85.5 wide bottom bracket to work with the new crankset. The bb ...
- 11
0
votes
1
answer
1k
views
Stripped threads on the bottom bracket
I have a new to me, old to the world Bianchi road bike. When inspecting it and taking it apart the bottom bracket threads are stripped out for 1-2 cm deep. This lead to the sealed cartridge unit not ...
0
votes
1
answer
662
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2018 Diamondback bottom bracket size
Does anyone know what size a 2018 Diamondback Line bottom bracket is?
- 1