Snapped Bottom Bracket

What's all this about? Is this common? Wasn't cycling particularly hard leaving a junction. Fortunate to still have bollocks in tact...

http://i33.tinypic.com/ivwh3p.jpg

what was it

how old was it

how had it been installed

that right there is a square taper fail. id say you're fortunate to still have your bollocks intact.

but no, its not that common especially on the road. do you know the history of the bb? are you really fucking heavy? do tricks and that? my advice is to chalk that one off to bad luck combined with really good luck. i doubt it'll ever happen to you again in your life if its never happened before. outboard bb ftw.

I'm just under 70 kilos. Wasn't standing up either really, didn't have weight on saddle though. Certainly don't do tricks, running 45:14. Think it's a Miche Primato BB that was on bike when I got it. Possibly quite old, but been relatively well looked after...

Lucky I wasn't darting into traffic too! Hopefully crank is ok.

Will be sure to get outward bb then.

doesnt sound suspect to me. just rotten luck like i said.

please feel free to ignore me about the outboard bb thing. to make that change would require new crankset aswell as bb so not always a viable option as it costs £'s. i simply have a rather strong dislike for square taper and have had for years. but they serve millions of people just fine every day in this country and in their thousands on this forum so im defo in the minority.

just buy a new bb. when you or a shop take it out it should the axle length on it and you can measure the shell width easy enough so the whole thing should be cheap and last you a long time. i imagine the cranks should be fine but take them to a shop and get a mechanic to cast teir eye over them, i'd reccomend brixton cycles but there are plenty other good ones to choose from depending on your location.

good luck. and good luck getting it sorted over the bank hloiday..... thats gonna suck.

45x14 is highish, but nothing nuts. Chalk it up to bad luck.

first of all i apologise for hijacking your thread. it was just that it was the most recently posted in the mechanics section and i really need some advice pronto.

Right now, i have no money to buy some track wheels to complete my most recent bike project so im converting the rear wheel that was originally with the bike. So far ive got the sprocket held in place with a BB lockring. With no brakes im worried this just wont hold and it will end up with me in hospital. Soo... my mate wants to weld the sprocket onto the hub... tomorrow morning! Is this possible?? Is the metal types suitable for welding? I just dont know. Have people done this before? I know this is a bit of a long shot hoping for advice before tomorrow morning but it thought it was worth a try.
cheers!

Read this thread: http://www.lfgss.com/thread42649.html
Synopsis: You cannot weld cog to hub as cog is steel (probably) and hub shell is aluminium (probably). People have used electrical ties or pritt stick in the past and it has been AOK.

Seriously though- use Araldite. And get some brakes.

get some brakes.

yes to this so many times over...

cheers for the advice. ive managed to put off the welding for a day or two. The wheels are fairly old, late 70's i think and closer inspection it looks to me like they are steel not ali. I dont know fuck all about metals really so i could be wrong. And if it is, and welding is possible, any other forseen problems anybody can think of??

And get some brakes.

ye your right, i know. but that means buying a dirty harry brake lever or one that can fit on the center of my bars, and most importantly more money. of which i have none. i will put one on but i want to ride now!! impatient or what, but if i can this to work there might not be anyneed for brakes. hopefully.

best thing you can do mate, get a new hubs.

check if your rims (or ask a LBS (local bike shop)) to see if it's fine, if so, count the number of holes on it (excluding the valve holes).

get a hubs with the same number of holes, ideally Planet X is a good source, and ask your LBS to build the wheel up for you.

rear wheel are something you do need to invest properly when you want to convert a bicycle into a fixed wheel bike, or purchase a full wheelset for £99 instead, better safe than sorry.

Last thing, check Sheldon Brown for all your need, he have a lots of information about turning a bicycle into a fixed wheel one, and have some good advice.

yep, you;ll ruin the hub which may or may not be an issue for you. you'll never be able to change the sprocket, and potentially any spokes which break, which, if you get into riding more you'll probably want to do. if your mate fucks it up you're screwed.

someone on here will have a lever, it'll be cheap or maybe borrow one if you know anyone. just have two less take out coffees and beers at the pub this week and you'll have the cash.

by the way, if you are determined to go down this route, the use of a standard household magnet will help you out in determining the metal of your hub. aluminium alloys dont have iron in them so magnets dont stick, steel does so magnets will stick.

lever here for a ten

and again here with caliper

dirt harry here 8 quid

get off my thread

I'd listen to him if I was you, he's got bollocks of high tensile steel.

Cheers for the advice people. Gonna buy some loctite and a break lever. The originals are nice wheels and i dont want to ruin them by letting my mate loose with a welder. I get your point, bad idea.
Sorry Tee.

first of all i apologise for hijacking your thread. it was just that it was the most recently posted in the mechanics section and i really need some advice pronto.

Right now, i have no money to buy some track wheels to complete my most recent bike project so im converting the rear wheel that was originally with the bike. So far ive got the sprocket held in place with a BB lockring. With no brakes im worried this just wont hold and it will end up with me in hospital. Soo... my mate wants to weld the sprocket onto the hub... tomorrow morning! Is this possible?? Is the metal types suitable for welding? I just dont know. Have people done this before? I know this is a bit of a long shot hoping for advice before tomorrow morning but it thought it was worth a try.
cheers!

I hope you're joking talking about welding the cog on the hub.
Excuse me if I sound harsh, but if you say you have no money to buy brakes, neither you've a proper track cog with it's lockring.... erm... you should understand that it's not only your life that's put in danger, but anyone else that is on the street. If you were on Oyster card and no bike, it would cost you a lot more. Have your teeth re-done costs even more. Injuries to others a hell of a lot more.
Do yourself a favour :)

Haha ye i know. I have other bikes to ride. i just want to ride this one. Shes a beauty. As i said im too impatient. I bought some loctite which seems to be holding pretty well with the BB lockring. As soon as my loan comes through i will buy some track wheels. I think its best by the sounds of things.

loan? come on, it's entirely possible to get all the bits and bob for little, even free if you're a bit patient, have some creativity (i.e. finding old bike down the skip and taking off the usable part such as brakes).

Does anybody know where I may find a 103mm square taper bottom bracket?? Neither LBS has any, nor does Wiggle. Any suggestions ?

Shall I google that for you?

condor do a sugino but be wary I snapped one in half was funny tho as I had to pedal one legged.

Shall I google that for you?

very useful squabs, all US

Alright mumble, shall **I **google that for you?