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.)
408
questions
2
votes
1answer
53 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 ...
0
votes
3answers
48 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 ...
3
votes
1answer
69 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 ...
2
votes
4answers
117 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 ...
1
vote
2answers
120 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 ...
5
votes
1answer
148 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:
...
2
votes
2answers
84 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 ...
1
vote
1answer
49 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.
1
vote
1answer
117 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?
1
vote
2answers
60 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 ...
3
votes
2answers
249 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
37 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 ...
2
votes
2answers
646 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 ...
0
votes
1answer
66 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 ...
1
vote
1answer
57 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 ...
1
vote
2answers
102 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 ...
1
vote
2answers
60 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 ...
2
votes
0answers
49 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 ...
1
vote
2answers
128 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 ...
2
votes
2answers
59 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 ...
1
vote
1answer
51 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 ...
0
votes
1answer
80 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 ...
1
vote
3answers
173 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 ...
0
votes
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 ...
1
vote
2answers
102 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 ...
10
votes
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 "...
1
vote
3answers
161 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
votes
0answers
79 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 ...
0
votes
1answer
43 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 ...
2
votes
1answer
86 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
votes
1answer
121 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
votes
1answer
146 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 ...
2
votes
2answers
98 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 ...
2
votes
3answers
475 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
votes
3answers
268 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, ...
2
votes
3answers
120 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,...
3
votes
2answers
138 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
votes
1answer
84 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 ...
4
votes
1answer
212 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 ...
4
votes
4answers
234 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
votes
1answer
71 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 ...
1
vote
3answers
457 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 ...
1
vote
2answers
108 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?
4
votes
3answers
845 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, ...
0
votes
1answer
126 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 ...
3
votes
1answer
118 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?
3
votes
2answers
89 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 ...
5
votes
1answer
172 views
Threadlocker and Bottom Brackets
The main threadlocker brand available in the US describes its red compound as "permanent" and requiring heat (> 550°F) to free up, and its blue compound as medium strength and requiring only hand ...
3
votes
2answers
143 views
What crank arm bolt is required here?
The crank arm on my Decathlon Triban 520 became loose during a cycle. On inspection the crank arm bolt is missing. What bolt do I need as a replacement? (Or how can I figure it out?)
The manufacturer ...
1
vote
3answers
85 views
how do i put my bottom bracket back together
I was bloody relived I could get the bb apart that I just rushed ahead and fogot to take note of how it came apart.DOH!!
I now have the following dilemas
1)What size bearings were they again(dont ...
