poopipe Posted September 26, 2006 Report Share Posted September 26, 2006 long story shortknee is finally working again so...finally got round to finishing building my new shiny t-lite (thankyou JT)borrowed big b*****d spanner from julienremoved BB from t-pro frameattempted to fit BB to t-lite frame 2 turns in and the f**ker stops moving - where am i going wrong?the threads in the frame look fine - no obvious lumps of metal in the way, everything looks even -all kushti as it were. I can't fathom why I'd have any trouble fitting a BB from one onza into another onza so this has angered me greatly. I'm fairly certain im putting everything in the correct side and stuff - as far as i can work out they won't go in the wrong side do these stupid bloody mountainbike BBs come in different TPI wotsits or something ? It's the only explanation i can come up with. I'm not going to force matters because the'll just result in a knackered frame -anybody got any advice on the subject ? (i've tried wiggling it around before anyone suggests it). I'm verging on paying the bike shop to sort it out - which is a sickening proposition. mountainbikes are gay Quote Link to comment Share on other sites More sharing options...
Zoo_Monkey Posted September 26, 2006 Report Share Posted September 26, 2006 (edited) not to sound patronising as you apear to know what you are doing but that sounds like classic cross threading, make sure the bb is 100% straight when you put it in, it helps to have the bike upside down and stand over it checking the axle is 90 to the frame. also - are you fitting it the correct way round? usualy the fixed cup goes on the drive side. this could have an effect.if you want to check the thread is clean on the bb shell and the bb cups get a wire brush spray on some gt85 and scrub - but follow the direction of the tread or you could mess it big time. fianaly use LOTS of lube- sereously you need to chuck tons of it in there - and real stuff not just gt85. bbs can be tight to fit and take a bit of strength, if its tough to turn thats ok as long as it dosnt get progresivley tougher (thats cross threading )if all else fails get the thread on the bb shell re-tapped and faced by your local bike shop - or better still pay them money to take the whole bb fitting job off your hands.edit = (oh and all bb threads are standard, so that wont be the prob) Edited September 26, 2006 by Zoo_Monkey Quote Link to comment Share on other sites More sharing options...
poopipe Posted September 26, 2006 Author Report Share Posted September 26, 2006 patronising is usually a sign of throughness your description of cross threading fits exactly what was happening which is precisely why i stopped. I think ill be hitting the bike shop then. let some other bugger deal with it i think cos i know i cant be bothered and ill just end up hitting the b*****d with a spanner.the next frame i get will be steel . stupid cheese metal Quote Link to comment Share on other sites More sharing options...
munkee Posted September 26, 2006 Report Share Posted September 26, 2006 Wack a bit of grease in and just keep trying the thread. Took me over 10 attempts to get a bb in my echo lite.. Quote Link to comment Share on other sites More sharing options...
TomR Posted September 26, 2006 Report Share Posted September 26, 2006 (edited) Try and old toothbrush and some degreaser to clean both thread surfaces as deep as you can, then regrease and try again, it always takes me a good few goes of slackening it off when it goes tight (edit: thats not supposed to sound as rude as it does...) and trying to realign it. Gets there in the end usually. Edited September 26, 2006 by planetxpimp Quote Link to comment Share on other sites More sharing options...
Orgun_Donor Posted September 26, 2006 Report Share Posted September 26, 2006 you should also be able to just screw it in mostly by hand, and then tighten with a tool and spanner, shouldnt need to use spanner untill its atleast half way in. Quote Link to comment Share on other sites More sharing options...
the judge Posted September 27, 2006 Report Share Posted September 27, 2006 (edited) Clean and grease the threads, and then fit the non-driveside to about 3/4 (maybe even a little bit more) of the way in before you fit the driveside, this can help to align the driveside to stop any cross threading Edited September 27, 2006 by the judge Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted September 27, 2006 Report Share Posted September 27, 2006 to answer the original question btw....BB's do come in different thread(ness)pretty sure all our trials bikes use the standard (western?) type...but there's also italian? road bikes mainly i thinks...who knows why..adam Quote Link to comment Share on other sites More sharing options...
poopipe Posted September 27, 2006 Author Report Share Posted September 27, 2006 Clean and grease the threads, and then fit the non-driveside to about 3/4 (maybe even a little bit more) of the way in before you fit the driveside, this can help to align the driveside to stop any cross threading thats quite cunning - assuming i can get the non driveside that far in without hitting it ill give it a rag.i still think euro BBs are ridiculous but im less angry about it now Quote Link to comment Share on other sites More sharing options...
F-Stop Junkie Posted September 27, 2006 Report Share Posted September 27, 2006 i still think euro BBs are ridiculous but im less angry about it nowEuro BBs? As in the BMX term? They're usually pretty easy to fit. The more expensive the frame, usually the better finished they are, so things like BBs go in better.The tip about putting in the non-drive side cup in is good. For any thread though is to put the two items together, then turn the bolt/cup/whatever the wrong way slowly and listen for a 'click'. Once you hear that, you know the threads have meshed and you can start turning it the right way.For BBs, it's not unusual to have a thread or two be a bit tight. What it takes some times is to work the BB in a quarter turn at a time. A quarter turn in, back a quarter, in a half turn, back a quarter, in a half and so on... You have to be certain it's not cross threaded though before you do this! If it locks solid and will not move, then stop!If you think it might be cross-threaded, then best thing is to put the BB in as far as you can without forcring it, then stand back and look along the frame either behind the rear wheel or in front of the front wheel, then above the bike looking down on the BB shell. Where ever you look, the axle should be in the dead centre of the BB shell. If it's not, and it should be pretty obvious if it is, then it's cross threaded. Quote Link to comment Share on other sites More sharing options...
JT! Posted September 27, 2006 Report Share Posted September 27, 2006 What BB is it? Quote Link to comment Share on other sites More sharing options...
Christophe' Posted September 27, 2006 Report Share Posted September 27, 2006 patronising is usually a sign of throughness your description of cross threading fits exactly what was happening which is precisely why i stopped. I think ill be hitting the bike shop then. let some other bugger deal with it i think cos i know i cant be bothered and ill just end up hitting the b*****d with a spanner.the next frame i get will be steel . stupid cheese metalsteel frame doesnt stop u being a c**t with tools does it ! Quote Link to comment Share on other sites More sharing options...
A!! Posted September 27, 2006 Report Share Posted September 27, 2006 steel frame doesnt stop u being a c**t with tools does it ! No but it doesn't f**k up as easy when you do Quote Link to comment Share on other sites More sharing options...
TomR Posted September 27, 2006 Report Share Posted September 27, 2006 For any thread though is to put the two items together, then turn the bolt/cup/whatever the wrong way slowly and listen for a 'click'. Once you hear that, you know the threads have meshed and you can start turning it the right way.I do that every time, im not gonna mess up an expensive lump of ali for the sake of saving a couple of seconds. Quote Link to comment Share on other sites More sharing options...
poopipe Posted September 28, 2006 Author Report Share Posted September 28, 2006 steel frame doesnt stop u being a c**t with tools does it ! if i were being a fanny with the tools i'd have knackered it instead of stopping and asking for advice wouldn't I? so nerrr i'll give the f-stop junkie technique a try - I was trying the back and forth thing but it felt like i was having to put too much pressure on the tool. I'll try it sober then its off down the shop Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.