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
922 views

Problem with internal gear routing cable and bottom bracket

I have a problem where I got a frame made I asked for internal cable routing and it has arrived but there is no provision for the cable to pass through the bottom bracket. It is a titanium frame and ...
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1answer
1k views

Are there any non-Shimano Hollowtech II compatible cranksets?

My power meter is Hollowtech II and I need to replace the crankset. So I’m looking at Shimano cranksets. Were there ever, or are there now, any Hollowtech II compatible cranksets made by any other ...
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3answers
2k views

Can I replace a GXP press fit bottom bracket with a Hollowtech?

I've recently acquired a frame for a project and have an Ultegra crank set from my crash bike I want to use on it. The frame currently has a GXP 24mm press fit BB and I've got a spare Hollowtech BB,...
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3answers
2k views

GRX crank with Ultegra groupset

I currently ride a full Ultegra di2 setup with 50/34 chainrings and 11/32 11sp rear cassette. I would like to run the GRX 46/30 chainrings because 50/11 gearing is a waste for me. I could either ...
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2answers
284 views

Shimano crankset with FSA bottom bracket?

I have just taken off an FSA crankset from my Orbea Avant M30. The bottom bracket is a BB 86/92. I would like to replace with a Shimano crankset, an Ultegra or 105. Do I need to change the BB to a ...
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1answer
153 views

Achieving Correct Beltline for Gates Carbon Drive

I’m building up a Soma Wolverine with a Gates Carbon Drive and Alfine 11 internal gear hub. The Gates literature indicates that the beltline should be 43.7 mm +/- 1mm. I am trying to use an old ...
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0answers
117 views

Longer side of bottom bracket goes toward which side of bike?

I am replacing the bottom bracket bearings on my Schwinn World Sport. Which side of the bike does the longer side of BB axle go to? I would assume chain side but just wanted to make sure.
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2answers
103 views

Please describe what an integrated bottom bracket is

The article on bottom bracket terminology at Park Tool and the Wikipedia article do not say what an integrated bottom bracket is and other resources online assume the reader already knows what one is. ...
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1answer
825 views

Proper crank arm spacing?

Is there a proper way to space crank arms in relation to the bottom bracket? Ive noticed most builds are generally +10mm on the right side in relation to the bottom bracket, but i feel like maybe they ...
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2answers
2k views

Changing cranks from Praxis to Ultegra (BB advice)

I purchased a Specialized Roubaix Comp 2018 last year, I was not intending to purchase this bike but Evans had a 40% off sale and the deal was too outrageous to pass. I was originally looking at bikes ...
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2answers
452 views

Need help finding compatible bottom bracket and crank set for track bike

My bike is this: https://www.santafixie.co.uk/derail-black-fixed-bike.html The BB measurements on the link are CH55 BSA 68/107. I know literally bare minimum about bottom brackets and crank sets. I ...
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500 views

What type of bottom bracket is this (pictures)? What tools do I need to replace it?

This bike has a lot of play on the bottom bracket. Here are pictures: What replacement can I buy for it? It looks like a square tapper BB to me, how do I measure which size I need? I do not have the ...
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1answer
576 views

Drivetrain changed - new cranks further from bottom bracket

On the weekend I did an overdue drivetrain change. Everything went fine and runs rather smoothly, but I had to adjust the front derailleur a lot. It seems like the new cranks are about 5 mm further ...
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1answer
81 views

Praxis Works M30 crankset to FSA BB30 fitted in a BB386EVO shell

I have a BB386EVO frame shell and a FSA PF BB30 fitted into it. All good with this Now, I have a Praxis Works M30 crankset that I want to use but I haven't been able to install. The axle seems too ...
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2answers
2k views

Lost left crank arm crank end cap

What parts do I need to put this back together? I've lost some pieces going for a ride but I'm not sure what exactly. I think I'm missing the end cap to the crank and maybe a spacer. I was heading ...
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2answers
895 views

Road chainring rubbing on frame

Problem My chainring is rubbing on the right, rear chainstay when I attempted to install my crankset. Frame: Trek 520 Disc (54 cm) Crankset: Shimano 105 FC-R7000 (52/36, 170mm) Bottom Bracket: ...
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2answers
139 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 ...
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3answers
970 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 ...
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3answers
276 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 ...
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1answer
183 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 ...
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4answers
395 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?
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1answer
642 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!
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0answers
104 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 ...
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1answer
293 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
330 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
4k 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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3answers
240 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
464 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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5answers
1k 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
197 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
167 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
388 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
54 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
139 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
369 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
261 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 ...
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1answer
112 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
676 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
2k 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
223 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
718 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
242 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
63 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
1k 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
507 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
275 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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1answer
578 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
191 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
241 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
348 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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