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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Square taper bottom bracket noise from street riding fixed gear
I’ve been trying to eliminate crank/bb noise in several different Sugino RD2 cranksets over the years with no luck. Always a faint click, once per revolution on the crankarms.
I’ve tightened ...
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1answer
75 views
Crank arm play, should I get spacers?
I'm building my first fixed gear bike and I'm nearly finished, I just have to tighten up my crank bolt and wrap my handle bars. The thing is, the crank arm seems to wobble a lot and idk what to do. I'...
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2answers
66 views
Different chain guide mounts… Why?
I think there's two types of chain guide mounts, one of them is screwing in screws and another one is using the bottom bracket to hold it in place. Why not just use one type of mount? Is there a ...
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1answer
97 views
Crank and Bottom Brackets Compatibility for Shimano GRX
I want to get myself a GRX810 2× but instead of buying the recommended (by Shimano) bottom brackets (SM-BBR60 or SM-BB72-41B Pressfit Hollowtech II) I would like to go with either the Token TF24 or ...
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61 views
What is typically the best bolt to hold Park BBT-22 on to square-taper spindle?
If one is trying to remove a stuck square-taper bottom bracket, it is hard to both hold the tool onto the bottom bracket splines and turn it at the same time. Many tools, like the Park BBT-22, have a ...
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1answer
78 views
Do I need to have this thread screwed all the way in on bottom bracket BB-UN53
I'm restoring a 1994 Mongoose Switchback (which I've had since college so I'm unreasonably attached to it). When I was removing the bottom bracket, a Shimano BB-UN 53, I cracked the plastic non-drive ...
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4answers
146 views
Can a road bike BB work on track bike?
I have Merida track 500. It comes with a 175mm FSA vero track crankset and JIS square taper cartridge.
I want to change it with Miche Pistard Air track crankset, 165mm and for that I need to change ...
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2answers
126 views
Misc bottom backet and crankset questions [closed]
I am planning to upgrade a few of my bikes .. some due to faulty BBs and some just to upgrade the crankset. Here are the questions I have:
1) Road vs MTB
I read from the another post about Road vs ...
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1answer
152 views
Remove fully enclosed bottom bracket
I am in the process of replacing my worn out bottom bracket. After removing the crankset I see that there are no insets on the bottom bracket for my bottom bracket removal tool to latch on to:
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2answers
88 views
Tightening a loose bottom bracket
I bought a new bike a couple of months ago. Recently I noticed that the bottom bracket is getting loose. It is regularly unscrewing itself, and while I can screw it back in partially manually, I ...
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1answer
50 views
Bottom bracket for Bottechia 989
Can anyone guess what type of bottom bracket this is? I'd like to get all the parts ready so I can open and clean it all at once.
It is a Bottechia 989 frame that I bought in Egypt.
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1answer
121 views
Broken bottom bracket
When applying pressure to my bike to go faster to maintain a speed, my bike aggressively ticks and doesn’t run smoothly. Could this be the bottom bracket?
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2answers
69 views
External BB cranks not spinning well
I have a Cannondale F2000 that I'm updating and turning into a gravel/commuter bike.
I replaced the original square taper bottom bracket with a new Hollowtech II version.
Now the new crank does not ...
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2answers
250 views
BV-217 Antler bottom bracket service or replacement
I have a BV-217 Antler
It is at least 7 years old and has had minimal maintenance, if any. I am stripping it down to its bearings and cleaning, re-greasing, reassembling etc.
I am stuck at the ...
3
votes
1answer
39 views
How to loosen eccentric BB shell?
I have a one-year-old REI CTY 1.3. Aluminum frame, belt drive, with an eccentric BB shell for tensioning the belt. The bottom bracket itself is a standard Shimano BB-RS500, but I cannot identify the ...
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2answers
648 views
I nicked the tip of the taper on a bottom bracket spindle. Is it still safe?
I had to cut the crank arms off of a bike I'm working on. Used an angle grinder. Despite my efforts to avoid damaging the bottom bracket spindle, I nicked it in three places, all at the tip.
The ...
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1answer
89 views
Replacement bottom bracket compatible with BB-UN100
My bike has recently developed creaking noises from the bottom bracket area so I decided to take everything apart, give it a good clean, apply some lube and reassemble.
What turned out to live inside ...
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1answer
65 views
Bottom Bracket on a Trek CrossRip Elite 2015?
I'm wondering if anyone can tell me what size bottom bracket would have originally come with the 2015 Trek CrossRip Elite?
Their bike archive doesn't have any BB detail.
I did find these two ...
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2answers
126 views
Replacing BB, but found mountain + road cranks and am confused
Last year I bought a Norco Search 105 Hydro (https://www.norco.com/bikes/2018/dirt-dropbar/gravel/search-aluminum/search-a-105-hydro/) and from the beginning had bottom bracket creaking. Brought it ...
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2answers
67 views
Lube new sealed bottom bracket (BB-UN55)
I have a new sealed bottom bracket, a Shimano BB-UN55. Does it come with lube, and if so what kind of lube would that be?
I assume it's already lubed, because how would you lube it without taking it ...
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0answers
51 views
Alternative to strange BSA BB
Left on the picture new shimano 68x122 mm BSA BB. Right one was installed on my bike. It's written there: JIVE 3.0 128K 123. The spindle is 128 mm.
I've mesuared BB tube, it's 68mm. It has also a ...
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2answers
156 views
Tightening bottom bracket prevents crank spindle from turning
I have a relatively new mountain bike with a Truvativ Power Spline bottom bracket. I noticed that it was loose with some lateral movement in the crank arms, so I took everything apart and proceeded ...
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2answers
70 views
What tool should I purchase in order to replace the bottom bracket in my Giant Defy 3?
I'm changing my front crankset from Gossamer FSA 105 to Shimano 105 FC-R7000 in my Giant Defy 3 road bike from 2015...
I kinda stuck on removing the bottom bracket as I'm not sure which type of tool ...
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1answer
55 views
How difficult is it to install internal seatpost drop cable housing in 2018 Specialized Epic Comp?
My 2018 Specialized Epic Comp (Aluminum) has a 24 mm threaded bottom bracket. If I remove the bottom bracket will I be able to route the cable housing down the down tube (there is an opening in the ...
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107 views
Bottom bracket upgrade
I want to upgrade the components on my bike. I want to start with the crankset. I'm just sourcing parts/tools at the moment. It originally came with 113mm spindle sealed cartridge. The bottom ...
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3answers
175 views
My road bike seems slightly too big for me
After riding for about 300km, I'm looking at adjusting some parts to fit me.
First adjustment:
Because I feel that I'm stretching a little too forward, causing my back to ache, I've decided I would ...
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1answer
39 views
Rattling bottom bracket
I broke my chain catcher, so i replaced it. but after assembling everything back on to the bike, i noticed that there's some rattling noises in the bottom bracket. Does that mean that i should buy a ...
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2answers
112 views
Upgrading a crank set
I presently have a 3x7 speed crankset with a sealed cartridge bottom bracket on my touring bike and want to upgrade to a new Hollowtech II bottom bracket and crankset, specifically, the SHIMANO Claris ...
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2answers
2k views
Broken bottom bracket?
I bought a Trek FX Series 7.5 in April 2017 and ride every day for about an hour. Two weeks ago the crank arms suddenly gave around the bottom bracket and no longer stayed 180 degrees to eachother. I "...
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3answers
164 views
Can a Mamachari be fitted with an 11 speed 52-36T crankset and FD?
I would like to upgrade this bike with a better and faster crankset, 52-36T, but I'm confused if my planned setup will be compatible with the bike I have. I have consulted in our local bike shop and ...
3
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0answers
82 views
Determining bottom bracket type
I'm fixing up an old bike I bought in Belgium. Not sure about the exact brand/year.
The bottom bracket axle is branded "Flandria". It's a cottered axle. I want to replace this with a square taper ...
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1answer
46 views
Front derailleur will not sit properly on large cog without chain rub
I bought a Vilano Commuter bike ( 3x7 speed ) a while back and recently upgraded the front derailleur, crankset, brifters, pedals and rear derailleur to tourney A070 components. However, I can't seem ...
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1answer
88 views
What is this crank and BB on this bike? And how do I take that sort of crank off?
I have a 2009 Cannondale Six Carbon 3, which supposedly has a BB30 bottom bracket and a FSA Gossamer non-BB30 crank set. It looks like this:
I'm having some creaks when I pedal and I'm trying to ...
2
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1answer
132 views
1991 (I think) Trek 850 MTB bottom bracket replacement. Maybe similar to 830?
I have a Trek 850 MTB that needs the bottom bracket replaced. Is there a standard size to order? If I take off the bike will there be a number that will help me order a new one or do I measure somehow?...
2
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1answer
167 views
Shimano LP25 Sealed Cartridge Bottom Bracket
I recently attempted to rebuild a sealed cartridge Shimano LP25 bottom bracket. These are meant to be replaced when worn out, but I thought: if someone on YouTube can do it, I can too. The problem is ...
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2answers
103 views
Not able to get crank bolt into bottom bracket spindle
I recently posted a question about changing my chainset, I was advised on this SRAM chainset which I could use which would fit my square tapered bottom bracket.
I have attempted to fit the new ...
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3answers
611 views
How to remove hex crank bolt
I have been looking online for tutorials on replacing a chainring (or three) for my Scott mountain bike: https://www.thebikelist.co.uk/scott/aspect-40-2012
When trying to take off the chainset so ...
3
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3answers
278 views
How do I remove this style of bottom bracket?
I am attempting to remove and replace the bottom bracket from a cheapish 1970s American department store road bike. I've gotten the lockring off, and now the non-drive side looks like this:
[Whoops, ...
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3answers
124 views
Bottom bracket sizing
I have a square taper BB which has started squeaking.
When I took it out to see what size I have, when I was putting it back in I noticed that when I tighten it to a level which to me felt reasonable,...
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2answers
147 views
Worn out square taper bottom bracket spindle?
I got an used bike with a worn out left crank arm. I tried replacing with a new square taper crank arm and torqued it to 40nm; however, it started creaking soon after and the bolt had become loose (I ...
2
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1answer
87 views
Single chainring conversion issues
I've got a Specialized Crosstrail Elite. I want to get rid of the front derailleur and go for a single front chainring.
Its a 68mm BB shell but needs a 73mm BB with spacers. It currently has a FSA ...
5
votes
1answer
237 views
Shimano Front Chainwheel FC-MC19 Replacement?
I have Shimano FC-MC19 22/32/42 175mm crankset on my MTB for 17 years and it's time to replace it but I find it difficult to figure out what new crankset will fit my bicycle.
Two years ago I replaced ...
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4answers
268 views
Pitted Cups - Can I get away with this level of pitting?
I have two bottom bracket cups that I'd prefer to reuse (finding Avocet Bottom Bracket cups even on Ebay is hard!). I have purchased a replacement Avocet spindle of the correct size. I'm wondering if ...
3
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1answer
76 views
Octalink v2 bottom bracket on italian shell
I'm re-building an old Italian Bottecchia mountain bike which has Italian BB shell (70mm) and the previous bottom bracket was a square taper with 130mm spindle (measurement confirmed via calipers.)
I ...
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3answers
532 views
Can I grease a crank spindle/bracket without disassembling the crank set?
A bit of history: the grooves on the spindle are partially destroyed/skewed by cycling with a loose crank, so I applied a lot of force to a hexdriver to get the crank arm on. Now, it would be quite ...
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2answers
109 views
What is this bottom bracket standard called
I am looking to buy a cheapish power meter.I Would like to see if am improving at all.
I want to know my bottom bracket standard and if I can fit a bottom bracket power meter?
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3answers
987 views
How to install press fit bottom bracket into new frame
I bought a new carbon frame, which came with a press fit bottom bracket. All of the resources I can find for the installation of these includes information about how to remove the old bottom bracket, ...
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1answer
148 views
Use 105 crankset on 9x2 Sora equipped bike
Want to ditch my basic square taper FSA Vero (50/34) crankset on 9x2 speed Sora drivetrain (2018 Devinci Silverstone 2) in favor of 105 compact crankset. I will attempt to get one in 50/34 not to mess ...
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1answer
120 views
Bottom Bracket for Trek Crossrip Elite 2014?
I am planning to upgrade my group set to 11 speed 105 along with the bottom bracket. However, I have no idea what type of BB should I get and brand.
If anyone could help me that would be great?
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2answers
100 views
Strategy for removing a bottom bracket with plastic retainers?
Bottom brackets that have plastic retainers have a reputation for being problematic to remove. Often the tool interface on the plastic retaining ring will shear off if the plastic is old or the bottom ...
