Newbie! Which bottom bracket?
Hi people, this is my first post. I have a Specialized Secteur from around 2010 and it creaks l, synchronistically with my right foot near the bottom. I think I need to change the BB. I am assuming it’s a UN55 until I get it out; if so, are there any recommended upgrades?
Cheers!
Cheers!
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Depends which Secteur you had but I had the same model year and mine wasn't square taper. If it's threaded then you have options to upgrade but this will mean changing your chainset too and possibly having the bottom bracket faced properly so that everything lines up as it should. If it's a like for like replacement, the UN55 is as good as it gets really - was pretty much bombproof on my old Specialized Sirrus hybrid.0
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Ok useful info, thanks - I will wait before I get anything and see what it is at the weekend. Cheers!0
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Vizzage wrote:
Looks like the chainset is a square taper compatible jobby. I can see the threads in the centre where you would screw in the crank puller tool. That being the case then the UN55 is an ideal replacement for whatever BB is in there currently.
If you don't already have the tools then you'll need a crank puller
https://www.wiggle.co.uk/park-tool-comp ... 6wQAvD_BwE
Above is the Park Tools model - you can buy cheaper but I would stick with the quality item.
You'll also need a BB removal tool as linked to below
https://www.chainreactioncycles.com/par ... D_BwE&mx=a
Plenty of online videos to show you the way - the link below should be a start
https://www.youtube.com/watch?v=HSRS_rn5fEA0 -
I'm guessing from that pic that it's square taper. Best take off the cranks and whip the BB out to see what's in there. Could well be a UN55 but you need the same length to maintain the chainline.0
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^ must try to type faster...0
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Is this your bike? https://www.evanscycles.com/specialized ... e-00126023
If not, Evans are quite good at keeping listings of old stock, which is good to compare spec. If it's the one above, then a new UN55 will be all you need.0 -
Thanks everyone! Wow, fantastic! And yes BGB that’s exactly my bike. Awesome, cheers!0
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Mmmmmm bottom brackets0
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I love having BB90 on my Trek. So reliable, so easy to maintain*
*lies0 -
barongreenback wrote:I love having BB90 on my Trek. So reliable, so easy to maintain*
*lies
Mmm longlasting, maintenance free......
Long live the screw-in bottom bracket0 -
Hi again,
Ok. Taken out the BB. The label’s gone but it has stamped on it: RPM BB-7420, and on the non-drive-side taper it has 113 stamped.
So, final question, what is the very best “direct replacement” for that? Cheers0 -
Vizzage wrote:Hi again,
Ok. Taken out the BB. The label’s gone but it has stamped on it: RPM BB-7420, and on the non-drive-side taper it has 113 stamped.
So, final question, what is the very best “direct replacement” for that? Cheers
Is it English or italian thread? i.e did the driveside undo the wrong way (english)
anyway order here https://www.chainreactioncycles.com/shi ... -prod713690 -
The non-drive side was normal; the drive-side I had to turn clockwise to undo.0
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Vizzage wrote:The non-drive side was normal; the drive-side I had to turn clockwise to undo.
Thats English.0 -
Brill, ta, ordered one. Then decided to make a “minor tweak” to the derailleur and ended up having to spend 3 hours on all the little adjustment screws, gear cable adjustments, nothing seemed to work - I even had the chain off and in a bucket of turps at one point. Thankfully back together now and seems to be working. Mightily relieved. And the creaking’s still there thank goodness.0
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lol after this youll be comfortable repairing anything on your bike ololol0
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Right, replaced it with a lovely new shimano un55 and it’s 100% gorgeous. Thanks all for your help.0
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Vizzage wrote:Right, replaced it with a lovely new shimano un55 and it’s 100% gorgeous. Thanks all for your help.
Nicely done
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