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.)

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35 views

Do you know what bike this is? I thought Dunelt fleur de lys

It has cable brakes front and rear. Single speed freewheel. Two tone paint (light blue and dark metallic blue). Made from Reynolds 531 tubing.
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3answers
95 views

How do I know when to change my crank bearings?

My crank makes a bang when I pedal hard or up hill and don't know what makes the noise
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59 views

Where to buy dust cap for bottom bracket for an old bicycle?

I need to buy replacement dust cap for the bottom bracket in the picture. Is it still available anywhere? Under what name can it be found?
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288 views

Cup and cone bearings: better a little tight or a little loose?

A bike is commonly full of cup and cone bearings: pedals, hubs, bottom bracket, headset etc... The component change but the logic still the same the bearing is in between an axle, a pair of cones and ...
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1answer
43 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 ...
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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 ...
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2answers
56 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" ...
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1answer
175 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 ...
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1answer
45 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 ...
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1answer
50 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 ...
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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 ...
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109 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 ...
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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 ...
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1answer
87 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 ...
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2answers
192 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, ...
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1answer
94 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?
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1answer
296 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 ...
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1answer
106 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) ...
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1answer
138 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 ...
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1answer
109 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 ...
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1answer
301 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 ...
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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 ...
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1answer
158 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 ...
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156 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 ...
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98 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 ...
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4answers
122 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'...
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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 ...
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1answer
95 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
62 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 ...
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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-...
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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 ...
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88 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, ...
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116 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-...
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1answer
264 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, ...
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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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101 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.
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1answer
202 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? ...
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497 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 ...
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90 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 ...
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198 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 ...
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2answers
212 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 ...
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1answer
151 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 ...
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3answers
236 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 ...
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1answer
72 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 ...
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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 ...
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123 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 ...
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3answers
418 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 ...
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2answers
276 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 ...
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53 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 ...
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43 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?

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