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.)

Filter by
Sorted by
Tagged with
2
votes
1answer
41 views

Bottom bracket damage work-around

I built up a Specialized Rockhopper over this last summer, ending up with a sleek, blacked out, Deore & XT equipped thing of beauty. During a brief stop at a buddy's place, the 12mm Kryptonite ...
6
votes
2answers
128 views

Wilier oversize bottom bracket bearing cups for Shimano crank

My bike frame is a Wilier Imperiale with Campagnolo crankset. I am changing the crank to a Shimano 6800. The bottom bracket does not fit to the Shimano one. It is old version WILIER OVERSIZE BOTTOM ...
1
vote
3answers
100 views

Bottom bracket length and chainline

I'm considering to replace my bottom bracket. My current one is a cheap 68x115mm squared. As I'm obsessed by bike weight, there is a titanium product I'd really love to install. However, the closest ...
1
vote
1answer
144 views

Bottom bracket servicing

My crankset is driving me nuts, because of creaking noises when pedaling. I have fixed the issue twice already, by removing the bottom bracket (FWIW, it's a 68x115mm square, pictured below, and my ...
4
votes
4answers
243 views

Can early 2000 era frame use the latest group sets

I have a Schwinn Peloton LTD from early 2000 with a 10 speed DuraAce crank. The label on the bottom bracket says BC1.37x24 ROAD. Can I get the latest Shimano group sets to work with this frame?
2
votes
1answer
67 views

Replacing Apex 1 crank arm with Shimano 105

I would like to buy a 4iii power meter integrated in a Shimano 105 crank arm. On my bike I currently have SRAM Apex 1. Will this be possible? Thank you!
1
vote
0answers
76 views

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 ...
0
votes
1answer
82 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'...
1
vote
2answers
70 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 ...
2
votes
1answer
205 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
63 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
83 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
217 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
132 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
155 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
89 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
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.
1
vote
1answer
122 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
86 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
252 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
43 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
650 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
146 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
81 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
141 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
74 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
57 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
186 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
95 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
58 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
145 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
176 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
40 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
121 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
169 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 ...
4
votes
0answers
88 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
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 ...
2
votes
1answer
96 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
145 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
191 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
108 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
706 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
288 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
127 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
149 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
88 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
258 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
300 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
79 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 2 3 4 5 9