bottom bracket

In all the cycling stuff I've read, the name of this piece has never been adequately explained. Tell me it's something simple, and I'll shut up...

Hi all, After recently indexing the gears on a new bike (not yet written), I’ve come back to it tonight to check everything over and there’s a noise I’ve not noticed before. Any ideas? Wondering if the chain needs lube or it’s the bottom bracket, obviously more worrying. Video below, try...

Cleaning up a few old frames and i have removed all salvageable parts except the righthand sjde threaded cup! The other side is relatively easy and a conventional spanner fits, but this side is larger than my biggest 32mm but so thin i cant grip with a set of adjustables! Thought about welding a...

I hope this guy stripped and re-greased his hubs and bottom bracket after this bit of bravado..... https://www.bbc.co.uk/news/av/uk-scotland-49275630/determined-cyclist-makes-it-through-flood-water-in-edinburgh

Sold, Shimano 105 Octalink chainset and Ultegra bottom bracket. FC-5502 (105)double, 172.5 crank length, 53/39 rings. Excellent condition except for a couple of marks on the non drive side crank arm (shown in pictures). Cadence magnet also adhered to non drive side arm but can be easily...

I have a 73mm octalink BB that I'm wondering if I can use in a 68mm shell frame. I'm thinking if I use a 2.5mm spacer on the drive side the chain line would be the same (might see if a cassette spacer will fit). The only disadvantage I can see is that there'd be 2.5mm less threads engaged on...

Hey All, Without taking the bike apart, I was hoping to figure out what a knocking or pinging sound is due to. It seems like it's coming from the bottom bracket. It happens at the same point in my peddle cycle (although that point has changed over time). I suspect something is loose like a...

How do you determine the correct length square taper bottom bracket cartridge for a bare frame when you have no old one to go by ?

I think My Specialized Allez is either 2015 or 2016 (I bought it 2nd hand late last year) and is fitted with the Shimano Claris Octalink Groupset. I have recently started getting an annoying clicking noise once per pedal revolution which I think is coming from the BB. I've tightened everything...

Hi, I know this is workshop, but it applies to traditional tech so thought it better suited here. I need to replace the bottom bracket on my road bike, it's been on there 10 years, done goodness knows how much millage and it rocks and knocks. What's on is what I could get hold of at the time...

Servicing bike canlt seem to find replacement BB UN72 bottom bracket. Is there an alternative I can use

Servicing bike. Can't seem to find replacement BB UN72 bottom bracket. Is there an alternative I can use

Hi folks I have a Boardmam comp which must be over 10 years old I'm looking to replace the BB Does anyone know the correct sized one and a decent make. I'm aware that there are loads of different sizes of BB but maybe someone will know off hand. Regards Eldridge.

Some time ago I noticed that I had a noise on the crank, it was there when I first start to ride but would disappear after a few miles, it's now got to the point where it's there all the time. It's not loud but a slight tick/click can be heard somewhere between 6 & 7 then again somewhere between...

Having bought a wrong sized BB spindle length a while ago, I know how important it is to measure the one that currently fits and order the correct length for a replacement. I'm puzzled by the markings I see on a Shimano un55 packet, namely: 107 : ( M107) 110 : (M110) 113 : (LL113) 115 : (D-H)...

I am setting up a Ridgeback Panorama Deluxe as a tourer and installing an MTB chainset (Deore 36-36-26). Frame is https://www.biketart.com/bikes-c1/frames-c33/ridgeback-panorama-deluxe-frameset-p12171 BB is 68mm and this model...

There is such s proliferation of bearing types on the market now and new ones are emerging all the time. This article might be useful to those of you who want to replace BB bearings or cranks. Also includes tables of bearing sizes and compatibility. There's also a section on help to eliminate...

Need to find and fit a 46/36 chainset to my cx bike. The current one - fsa omega - works with a BB30. Have found others on ebay etc by different companies (the fsa omega version just seems to have disappeared) - but not sure if they would fit my bike. If i did go with another brand (eg shimano...

Is paying more for Angular BB bearings worth it or is standard BB bearings which cost around two thirds less, and would be noticeable as i read the description that standard bearings only have 3-4 ball bearings in contact at any one time as the angular bearings have all ball bearing in contact...

I still have my old Trek 850 from 1995 or thereabouts and, although I replaced it as my daily commute with a new bike in 2015, I'd like to get some more use out of the old thing as there's nothing wrong with it. The components are all worn silly so they're all going to need replaced, which...

It started making noises a few weeks ago. I've had it out and greased up all the joints but the issue is inside. I think 5K is about right?? Or is that a little soon?

Just a quick query. I am going to replace the triple chainset on my MTB for a double. The current BB is a Hollowtech 2 style one. The Double chainset I have is a square taper fitting so I understand that I will have to change the BB. The BB shell is 68 across, so I have ordered a 68 x 113 from...

I've been tinkering about with a new MTB recently - got a pretty good deal on it but it needed quite a lot of work. The entire drive train was pretty much shot to hell, covered in gunky gunge and sharks fin teeth all over the place. Fitting the new cassette and chain were no problem, but while...

After many years, my bottom bracket became noisy and I replaced it. The model that was worn measured 127.5 mm, so that it is the length of the replacement that I fitted. The replacement is fine; only a slight amount of twiddling with the limit screws was necessary and the inner chain ring clears...

I have a 1984 Raleigh Record Ace; it beeds a new bottom bracket. Is one of the threads in the shell a left hand thread and if so, which one? I have a new component on order but before I damage something removing the old one, it would be useful to know the answer. Thanking all in advance.

New Shimano BB-UN53 bottom bracket with 107mm axle, for BSA threaded bottom bracket shell 73mm wide ( as found commonly on MTBs). This has been installed in a frame and fitted with cranks, but found to be too short for the purpose and removed again without ever being used. Note all metal cups on...

I've restored and regreased my old Raleigh Merlin from around 1985 last year. Now it's going back into semi-active service again in a few months. I noticed a little movement in the bottom bracket, and just put a little more turn on the shell which seemed to help. But when turning by hand there...

My BB is knacked on my B'Twin 700 Ultra AF - I suppose 3,000mi in all conditions is fair play to it. The chainset/cranks are a Shimano RS500 52/34 but i can't quite work out what the BB should be. Hesitant to take it out without having a replacement to hand. I think it's either this one but...

I plan to take all our bikes’ bottom brackets apart for a service after this winter’s loveliness. I am a fan of Park Tools, but just can’t find the correct match on google or YouTube. It’s probably really straightforward but as usual I’m probably overthinking things. These are the bottom...

As per title. The drive side cup of my bike's bottom bracket is stubborn, so have been servicing from the adjustable side for fear of damaging the shell. If I decided to go for it and use Sheldon Brown's bolt through method , what are the chances of doing terminal damage to the shell? Has...