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Bottom Bracket


N Roach

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hey people,

I have got a t-pro 05 with problems with the bottom bracket area, recently my bb has been creaking so i bought a 127.5mm UN53 off chainreactioncycles, saturday i fitted the new bb, all went ok, abit loose fit.

Today when i got back from riding i sore that the bb had come loose, so off came the arms and i took the bb out to check it over, when i took it out there were thin metal rings that look like they had come from the frames thread, cleaned it all up and the bb all looked good so i placed the bb through the frame part into the other cup and started to tighten the bb, when the cup got tight to the frame it kept spinning, so i got the bb out again and put the original bb back in, it went in fine, and i took it for a ride, there were signs of loosening again.

my forts

There is two things i think it could be 1)I put grease on the threads (helps it come un-done) :$

2)the threads have gone! :(

Q's

-I need your expertise to guide me on what i should do?ALSO Are there to different size thickness shells?

-If the threads have gone, then where and how can i get them re-threaded?

Help people

Edited by chocolate_bikes
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On the drive side of the bb, is it serpose to screw in to the left? :unsure:

yer, mark had one of the frames with the faulty threads. what time of year did you get the frame? if its one of the faulty batch then supercycles will replace it no probs.

The bike was bought around the christmas before last, I'm trying to get off the details of purchase (Y)

Edited by chocolate_bikes
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um, that could well be one of the faulty ones then. get on the phone to supercycles.

What should i say + i havent got the resete yet :$ Will they replace the frame or the bike

Edited by chocolate_bikes
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1 sec, i'll go check the oner in my shed.

Hmmmmmm, doesn't seem to have one :S Didn't the 05 ones have the wrong sticker on them? 6061 instead of 7005 or something.

I dunno ive only have this bike 1 week + 1day, If they cant do anything about it then can it get helicoiled?

Edited by chocolate_bikes
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1 sec, i'll go check the oner in my shed.

Hmmmmmm, doesn't seem to have one :S Didn't the 05 ones have the wrong sticker on them? 6061 instead of 7005 or something.

it said U6 on my sticker i think.

I don't remember seeing the frame number anywhere on mine to be honest - it must be under the bash (the bolts are so bent i cant get the bugger off to check though)

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I have just taken bb out and the threads look good, but the old bb had a little movement, i think it was down to that as when i fort the bb was coming loose, (holding the crank arms, then pushing and pulling to feel movement)

is it best to have the bb tight or really tight?

Edited by chocolate_bikes
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I have just taken bb out and the threads look good, but the old bb had a little movement, i think it was down to that as when i fort the bb was coming loose, (holding the crank arms, then pushing and pulling to feel movement)

is it best to have the bb tight or really tight?

tight but don't go mental on it - that strips threads.

if you grease the threads up good it should stay in alright without you needing to jump up&down on the end of a spanner

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