Questions tagged [bottom-bracket]
The part of your bike that contains the axis the cranks arms spin 'round. (The crank arms are where the pedals attach.)
530
questions
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1answer
40 views
Can I fit a kickstand to my bottom bracket?
I'd like to fit a central kickstand to my Boardman Urb, and I wonder if I can use a threaded opening in my bottom bracket for that.
If it sounds like a bad idea, then what could be the purpose of this ...
2
votes
1answer
22 views
Bottom bracket removal Falter 3 speed
I am having issues removing this bottom bracket from a vintage Falter 3 speed bike. For once crank arm removal was super easy, cotter pins came right off. However, struggling with this one. I imagine ...
2
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2answers
53 views
how to calculate square tapered BB spindle length when coming from external threaded bearings
I want to move from 50/34 crank to 46/30 crank.
currently I have tiagra 4600 crank which is using external threaded bearings.
The crank which I am planning to buy "FSA Tempo Adventure 46/30" ...
1
vote
1answer
88 views
What bottom bracket would i need for my Specialized Allez Sprint 2020?
So i'm planning to build this bike up using Ultegra R8020 but i'm not sure what bottom bracket i would need. When I purchased the frame I was given these "cups" but im not sure if this is a ...
2
votes
1answer
44 views
Fixed cup bottom bracket removal
I have a square tapered bottom bracket which I am trying to remove but the fixed cup is proving difficult to loosen. The bike is a Peugeout Princeton from the early 90s. I have heard older French ...
1
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1answer
43 views
Diagnosing the cause of clicking sound coming from drivetrain
My bike is making a clicking sound on every downstroke of the left crank. Here's a recording I took while out on a ride: https://soundcloud.com/jugdish/20210309-1510-recording-2-edit/s-x5znI4sdTPu
It ...
3
votes
1answer
77 views
Creaking whilst pedaling (BB)?
I am having this creaking issue for months now it happens whilst pedaling and gets worse with more force.
I've checked the headset, the handlebars as well as re-greasing and reinstalling the pedals ...
0
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1answer
107 views
What bottom bracket type is this?
Can you help me identify the bottom bracket for the following please.
The frame is a Norco One25 (version 3)
It does not appear to have internal threads.
The diameter is approx 6.3cm and the length is ...
0
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2answers
71 views
With a cartridge BB if the shell threads are aligned on the same axis can the cartridge be unthreaded drive side with NDS cup in place?
If the BB shell's drive-side and NDS threads are aligned on the same axis, can the cartridge be backed out of the drive side while the NDS cup is still in place in the shell?
Edit: When I tried to do ...
2
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1answer
76 views
BB386EVO-24mm Press Fit Bottom Bracket Cup Removal
Good day to all!
Issue
My road bike has a BB386EVO bottom bracket standard with a 24mm internal diameter (I.D.) bearing set.
I'm utilising a 24mm spindle crankset so no issues there.
What I am seeking ...
3
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2answers
191 views
Removing old 531 frame bottom bracket. Where to source a pin spanner etc
I've been riding a vintage 531 frame bike which I've stripped and rebuilt. However, I'm having problems with extracting the bottom bracket. This has some play in it, so I really need to remove, ...
2
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1answer
85 views
Is a Hollowtech II BB compatible with an Octalink Crank? (Shimano Claris)
If I fit a Shimano Hollowtech II Bottom Bracket (Claris), can I still use my Octalink Claris crank?
4
votes
1answer
233 views
Can I use SRAM DUB Red Crankset in a Trek Madone SLR 7 that requires GXP?
I have an Allied Alfa Disc with SRAM Dub and Red AXS Crankset (with Quarq pm).... and I want to switch all my components onto this 2020 Trek Madone SLR 7 Frameset. My LBS says I have to buy a new SRAM ...
1
vote
1answer
101 views
Crankarm hitting frame - BB-R60 with GRX 1x11 Hybrid - Gravel conversion
Hope someone can help
I'm converting a hybrid frame to a gravel/adventure bike and am using the GRX 1x11 rx600 cranks. I've got myself a BBR60 Ultegra bottom bracket but the left-hand (non-drive side) ...
3
votes
1answer
125 views
Brand new Shimano BB-UN300 hard to spin when drive side is fully torqued
I'm installing a brand new BB-UN300 (68x122mm) into a 1991 Specialized Sequoia (replacing the pitted cup and cone BB). Out of the box, the BB doesn't spin very freely by hand, but that's to be ...
1
vote
1answer
108 views
bottom bracket refacing
I bought a new frame (online) intending to build up the bike. It will be used for recreational rides on gravel/dirt paths mostly.
The frame has an English-threaded bottom bracket shell. I happened to ...
2
votes
1answer
295 views
Anyone seen a hollow crank spindle cut through by an internally-routed derailleur cable?
I just want to share a recent observation, but I have to pose it as a question.
A person showed me an FSA Gossamer 30mm hollow crank spindle broken into 2 parts. The break looked almost as good as a ...
2
votes
2answers
156 views
Link between bottom bracket and rear wheel widths
I am building a bicycle by gathering some components I already have. It is for a basic bike, only used as spare bike.
I have to change the crankset and bottom bracket, as they are scrap.
The crankset ...
3
votes
1answer
128 views
What are/were the differences between the various Shimano square taper cartridge bottom brackets?
There have been a number of different square taper bottom brackets by shimano in the last decades. BB-UN91, BB-UN72, BB-UN55, BB-UN26 among many others.
They often correspond to the different tiers of ...
0
votes
2answers
153 views
Where should I prefer and avoid cartridge bearings in a bicycle?
All bicycle bearings, hubs, bottom bracket and headsets used to be cup and cone
bearings. However, recently there has been a trend to replace these with
cartridge bearings in new parts.
Is this a good ...
1
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2answers
96 views
What causes a slight rhythmic knock in the pedal?
My left pedal is sending a slight knock to the sole of my foot at every turn, at the 1 o'clock position. What could cause this? It happens on all chainring-sprocket combinations though not with the ...
2
votes
4answers
112 views
Replacing crank and bearing on cheap Murray
Murray Cross Canyon. The pedal crank is all one piece with regular bearings. What would I use to upgrade this? Is there a bottom bracket that i can use. The outside diameter of the bearing is 43mm.
I'...
2
votes
1answer
76 views
Product compatability (bottom bracket and frame)
I love biking, but I'm really no mechanic. I currently have a Shimano M6100 groupset (Deore) with me. A friend is going to give me a good deal on a carbon MTB frame, but I'm worried about ...
1
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1answer
89 views
Identifying Bottom Bracket on Merida Scultura 7000e
I've just purchased a Merida Scultura 7000e frameset (unsure what year model). How do I go about identifying what bottom bracket standard it uses so that I can purchase one.
Inner Diameter of the ...
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2answers
60 views
Changing arm length for DUB crank
My bike has a 175mm crank arm (https://www.sram.com/en/truvativ/models/fc-styl-6k-b1) on a Specialized Epic HT (https://www.vitalmtb.com/product/guide/Bikes,3/Specialized/Epic-Hardtail-Expert,27186)
I ...
1
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1answer
62 views
What is the purpose of spindle with longer non-drive side?
I've just discovered that Shimano has 107mm and 110mm spindles in their BB (square taper) -- the first one is symmetric and the second one is asymmetric. I have read why BB spindles are right-...
3
votes
2answers
102 views
Can given crankset have limit on spindle width?
I would like to buy new crankset which is described as having 54 mm chainline for 110mm bottom bracket (this is square taped BB). Since I need 50mm chanline I calculated that I would need 102mm ...
0
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1answer
86 views
Clank when starting to pedal
Recently I noticed that my bike makes a loud clanking sound when I start pedalling, both from a stand still and after freewheeling. If I remember correctly the problem started after I washed the bike, ...
2
votes
2answers
115 views
Bottom bracket models
Do I need to be concerned with the difference between a:
VP BC73 (https://www.halfords.com/cycling/bike-parts/gears-drivetrain-and-cables/vp-bc73-68-x-122.5-square-taper-cartridge-bottom-bracket-...
2
votes
1answer
225 views
Square taper bottom bracket tool doesn't always fit
I bought as bottom bracket tool some time ago, a generic Shimano one. sometimes with some sealed bottom brackets from ZTTO it worked beautifully. Sadly in the process of restoring a 98' Kona Caldera, ...
1
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1answer
54 views
How to measure bottom bracket size?
I need to replace bottom bracket on a 1991 Peugeot bicycle. What size should I measure when shopping for a new part? Size A is 140mm, which seems to be a rather strange size. Do I need to include the ...
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1answer
91 views
Trek Mamba 2013, what BB and crankset for 1x?
Can anyone help me to find which kind of BB and cranks do I need for an 1x11 upgrade.
1
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1answer
186 views
What is the difference between a threaded bottom bracket and one with press-fit bearings? [duplicate]
What is the purpose of a threaded bottom bracket like the kinds sold by Shimano etc.? How does this differ from a design in which bearings, spacers and seals are directly press-fit into a bike frame? ...
5
votes
2answers
493 views
Bottom bracket sleeve is not fixed
I gave my bike to the mechanic a few weeks ago since I have had some problems with my Token bottom bracket. He mounted a new Rotor BBright 4624L on my bike. Coming back from a gravel ride yesterday I ...
4
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2answers
89 views
Hollowtech BB and chain casing
I will have to replace my crankset to switch to a 26-36-48 one.
It is on a BSA 68 mm aluminium frame. I have a chain casing on this city bike (MTB converted to city).
Is it a problem to use a ...
5
votes
3answers
189 views
30mm bottom bracket and 30mm spindle axle compatibility, should it go in by force?
I am not sure if this is a stupid question or not. Finding compatible parts is not so easy for MTB, after quite a search I found my bottom bracket shell is not so standard, PF107.
I bought a Rotor ...
2
votes
2answers
177 views
Replacing 1x SRAM chainset with a Shimano chainset
I've just got a Genesis Datum 2019 bike on clearance.
The spec wasn't exactly what I would want—for a start it has SRAM rather than the Shimano we have on other bikes in our household—but more ...
0
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1answer
138 views
Replacing a crankset, do I also need to replace the bottom bracket?
I'm planning on replacing a Shimano FC-510 crankset with an FC-R7000. The bottom bracket has had light use (~2000km) and has no obvious play in it, however the videos I've seen showing removal of ...
5
votes
3answers
212 views
Compatibility of 41mm x 107mm bottom bracket shell
Hi I have spent several days looking for a bottom bracket and crank. At this point it seems that there is nothing but 1 traditional pressfit bottom bracket and 1 crank that fit this shell. However, I ...
0
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1answer
71 views
Clanking sound from the bottom bracket when I pedal
My MTB, having not received much TLC lately, was making a lot of squeaks and noises.
After a long-overdue clean-up and lubrication of the drivetrain, most have gone away.
However there's something ...
4
votes
1answer
90 views
What bottom bracket removal tool do I need?
I haven't been able to find a bottom bracket tool for this specific spline count/pattern. It looks like it might fit a standard 20-spline one, but I'm not sure since there are actually only 16, but ...
1
vote
1answer
116 views
Which kind of crank arm for my bottom bracket
I'm trying to make my indoor bike smarter by fitting a crank arm power meter.
The bottom bracket is a Tange bc 1.37x24t. Apparently it is of the English kind which is the most common.
Since there are ...
4
votes
3answers
388 views
Alternatives to Crankset Shimano M523 Octalink 40-30-22T
I have recently purchased a Merida 2015 7500 One-Twenty 3x10.
Link to bike specs: http://online.fliphtml5.com/pvouz/azox/#p=12
The crankset chain rings are very worn and need replacing.
More Pictures ...
2
votes
2answers
258 views
Bottom bracket spindle length
I have a square taper (JIS) Shimano UN-55 bottom bracket with dimensions 68mm (shell width) and 110mm (spindle length) on my single speed (chainline 42-44mm).
Can a set of Stronglight JIS track crank ...
1
vote
2answers
51 views
Finding the right bottom bracket crankset combo
I need to change my bottom bracket and crankset. But I'm not sure what to buy.
I know it's an eccentric botton bracket and I still need one because I use the internal gear hub Shimano Alfine.
My ...
0
votes
1answer
41 views
What bottom bracket will fit the Ribble Endurance SLR?
Will a Shimano Ultegra BBR60 bottom bracket fit the Ribble Endurance SLR frame? I cant seem to find any technical information on the frame anywhere?
0
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2answers
120 views
Crank arm loose (squared taper). Can it be fixed?
My problem is that my squared taper crank arm keeps on coming loose no matter how hard I tighten the bolt - it also starts creaking.
Here’s a video of the problem
https://giphy.com/gifs/...
1
vote
1answer
84 views
Italian bottom brackets and modern cranksets - a compatibility guide?
I have an Italian frame (presumably a Moser) which I chose to repurpose as a single-speed/fixie with parts from another Single-speed/fixie of mine, with the exception of the bottom bracket and ...
6
votes
2answers
784 views
Pedals turn but bike doesn't move
The bike I am riding is an older mountain bike that is a cheaper model, likely from Walmart or somewhere similar. I picked it up at the flea market and have been doing repairs on it as a way to learn ...
1
vote
1answer
54 views
Bottom bracket harder to turn half way around
does this sound like a I need a new bottom bracket ?
When I turn my cranks with no chain attached, it's pretty smoothe, no real noise and just goes for a while if I let it spin.
When I attach the ...
