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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2answers
89 views

Upgrade bottom bracket

I want to upgrade my bottom bracket (square taper 68x113 threaded) to Shimano hollowtech and fit a new triple crankset. My gears are 3x10 so will my front gears still work with the new set up. What ...
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3answers
90 views

Which bottom bracket for a Campagnolo Mirage 175?

Can anyone advise me which bottom bracket I need for a Campagnolo Mirage 175 groupset? It's going onto an old Dawes Reynolds 531 ST frame. The frame currently has a Shimano BB-UN100 bottom bracket, ...
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1answer
581 views

I replaced my bottom bracket and now my crank arm bottoms out on the square shaft before it can be torqued. What did I do wrong?

I just replaced my bottom bracket using another one of the exact same make and size (Sunlite 68mm x 103mm square tapered shaft cartridge). It installed smoothly and everything seemed to be going well ...
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2answers
676 views

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 ...
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1answer
90 views

SRAM GXP crank partially stuck in bottom bracket

I (unfortunately) have a SRAM Apex GXP crankset that I need to replace after less than a year of use because it's garbage. But I can't get the crankset out of the bottom bracket. I've taken the bolt ...
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1answer
114 views

Is my bottom bracket cracked?

I was inspecting my bike a couple of days ago and I found what seems like a crack on the bottom bracket welds (encircled below). I’ve ridden it for less than 150 kilometers. I know it’s hard to tell ...
7
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4answers
1k views

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 ...
3
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2answers
94 views

Converting Threaded BB Shell To Press Fit Shell

I have a bike with worned thread on the BB bracket shell. I talked to a mechanic, and he said that is difficult to repair the shell. The main problem is that he and most bike mechanic here has no tap ...
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1answer
63 views

BB-UN300 vs BB-UN54 bottom bracket durability

These 2 bottom brackets are the most widely available ones in my country. Which is the best in terms of reliablity, quality?
2
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1answer
75 views

Broken bottom bracket spindle on spinning bike?

So my spinning bike bottom bracket spindle (axle) broke. Anyone know where can I find a replacement? Here is an image and video of broken part
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1answer
90 views

1X11 build - align / slip / set up

Looking for advice on my 1X11 set up on a bike I’m (trying to) build: The chain slips off single front chainring, on the inside, when I move into biggest rear cogs (gear 1 or 2). When I align the ...
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1answer
268 views

Clicking sound when pedalling hard

EDIT: Dropped it off at my local bike shop and the mechanic had the following to say about it: Bottom bracket very low quality, also worn bearings. Due to open frame type was a lot of dirt inside ...
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1answer
108 views

Cottered Crank Bottom Bracket

Can anyone help me identifying the bottom bracket? It had a cottered crank arm but only on one side, the other side has nothing. I have no idea how to remove the spindle. I already tried hammering it ...
3
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1answer
74 views

What key/wrench to remove this FSA crankset?

I have never worked with bottom brackets or crank arms before. What keys do I need if I want to remove these FSA ones?
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2answers
91 views

Any Cranks/Bottom bracket that can replace syncros cranks/BB on a 2006 Santa Cruz superlight MTB?

My left syncros crank was recently backed into by a car. The cranks are 175 mm. The bottom bracket is also syncros brand, threaded, and the size is 68 x 110mm. I have a syncros triple chainring, 5 ...
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1answer
154 views

Quarq dfour installation

I'm looking into getting a sram quarq dfour power meter, but I'm a bit confused as to what parts I need. I have a Specialized Diverge 2021, which comes with ultegra RX810. I know I need the spider. Do ...
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1answer
109 views

SRAM S2200 - replacement BB30 spindle?

I'm having a hard time finding a replacement BB30 spindle for a SRAM S-2200 (X.0) crankset (originally fitted to a 2013 Specialized Enduro). I stripped the thread on the spindle, but I would like to ...
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1answer
67 views

New bottom bracket does not fit - am I wrong?

I bought and isntalled this bottom bracket; VGEBY1 68X120mm, Thread info: BSA 34.798mm 1.37*24TPI However the arms was too long. So instead i bought; Shimano UN300 68X 110mm, Thread info: BSA 1.37*24 ...
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2answers
258 views

Missing cover for Square Taper bottom bracket?

I'm assembling my first one-speed roadbike and would love your input. Right now i ordered the wrong size bottom bracket judging by the very large distance to the arms I'm ordering a smaller square ...
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2answers
75 views

How to match bottom bracket and crankset sizes?

I'm trying to buy a new bottom bracket. But I am not sure if sizes fits together. VGEBY1 Bottom bracket with CYSKY Single Speed Crankset 48tT. The bottom bracket has the following sizes; 68X118mm ...
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1answer
130 views

SRAM NX Eagle crankset on a Shimano bottom bracket SM-BB70

I just bought a SRAM NX Eagle crankset (DUB standard) for my bike but when it arrived I realised it doesn't fit in the bottom bracket installed on my bike (SM-BB70). Is there a way to make it work or ...
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2answers
109 views

BB creaking - gathering info needed for fixing

I've been doing some googling on fixing the annoying creaking in my bottom bracket. It's all good if it's in easy gears. The moment it's in the big front chain ring and small rear gear (ie. I'm ...
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2answers
386 views

Very Stuck Bottom Bracket

I have a very stuck bottom bracket (see image) Just trying to remove the adjustable cup (non-drive side) and the moment, and it's not budging. I'm trying to remove it with a Park Tool Adjustable Cup ...
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4answers
967 views

What type of bottom bracket does my bike have?

I found this old fixed gear conversion on CL for next to nothing. It's been really fun but I've noticed play in what I thought were the crank arms, but it turns out the spindle inside the BB has play. ...
2
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2answers
293 views

Vintage cup and cone bb

I am restoring an old bike and have got stuck, after removing the lock ring I attempted to remove the spanner fitting as seen on the photos, the fitting is very thin and so the spanner is slipping off ...
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2answers
209 views

Which cartridge bottom bracked to replace cup and cone bottom bracket?

I'm into a bit of historical research. I have a 1986 Panasonic DX-3000 bike with a loose bottom bracket. I haven't opened it up yet (I'll be ordering the required tools for the job while ordering the ...
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0answers
23 views

Euro External Outboard Bottom Bracket - Heard a crack while installing

While installing a euro bottom bracket (BSA threaded), I heard a crack while tightening the NDS. The frame is aluminum and I'm not sure what the material of the bottom bracket is. Bottom bracket Frame ...
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2answers
70 views

Adapter for Parktool SWB15

I recently purchased a break bar: https://www.parktool.com/product/3-8-drive-breaker-bar-swb-15 But have now come to realise that that I need an adapter between it and my bottom bracket key. Any ...
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1answer
617 views

SM-BB51 Replacment

I have an oldish bike around 8 years old. My bottom bracket has started to make a clunking/clicking sound. It currently has a SM-BB51 fitted. I'm unable to find a exact replacement in stock. I'm ...
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2answers
77 views

Can I substitute a square taper BB with different shell width and spindle length?

I'm swapping out a worn BB and crankset from a late 90s hardtail. I already have a new triple crankset that specs 122.5mm spindle length for proper chainline. However, the frame has a 73mm BB shell ...
2
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2answers
100 views

Did I choose the right bottom bracket?

This is my bicycle. I mounted a new Thompson 124mm bottom bracket (the narrowest of this kind I could find) and a new single-ring sqaure-tapered crankset. When set as in the pictures, there is a ...
2
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2answers
70 views

cartridge bottom bracket bearing "hitch" or slight grinding feeling in one spot when the spindle is turned by finger pressure

Bought a new no-name threaded cartridge BB with a titanium spindle recently, mainly out of curiosity. It's very light-weight but when I rotate the spindle gently between my fingertips there's a ...
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2answers
289 views

FSA crank + BB combination too tight

I have a bike here fitted by OEM with: FSA Omega Adventure MegaExo crank FSA BB-4000 No maintenance or mods done around BB area on this bike. If you are curious it is Pinnacle Neon 5 2019-version. ...
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3answers
112 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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1answer
65 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?
7
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2answers
403 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 ...
1
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1answer
45 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
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1answer
34 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
119 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
1k 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
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1answer
63 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
133 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
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1answer
85 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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1answer
116 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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2answers
83 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 ...
3
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2answers
344 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
208 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
210 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
875 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
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1answer
187 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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