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 Post subject: Bottom bracket help
PostPosted: Sat Oct 05, 2013 11:17 pm 
Newbie

Joined: Sat Oct 05, 2013 11:04 pm
Posts: 4
Hi guys, I'm new here and need some help, I have just resurrected my 97 M-TRAX 1000 for commuting to and from work. I changed the the crankset, chain and rear cassette, during this I found the bottom bracket was rough and noisy. The original is a BB LP25 and i was thinking of replacing it with a BB UN26E as all the dimensions look correct but it appears that on the old one the drive side is plastic threaded and on the BB UN26E it is the opposite way round. Does anyone know of a direct replacement or equivalent for the BB LP25??


Last edited by brett on Sun Oct 06, 2013 12:09 am, edited 1 time in total.

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 Post subject: Re: Bottom bracket help
PostPosted: Sat Oct 05, 2013 11:32 pm 
retrobike rider
retrobike rider
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Joined: Wed Apr 15, 2009 1:08 pm
Posts: 3118
Location: Woking
In their wisdom Shimano swapped BBs around a bit. However, all you actually need on the bike of this age is the bottom bracket shell width (68 or 73mm) and the length of the axle which is 110mm or 113mm I suspect. If you let me know the crankset (assuming Shimano) I can tell you the required axle length. The part number will start FC-

UN26 of the same dimensions would be a fair replacement: http://www.chainreactioncycles.com/shim ... -prod34652

SP


Last edited by Splatter Paint on Sat Oct 05, 2013 11:38 pm, edited 1 time in total.

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 Post subject: Re: Bottom bracket help
PostPosted: Sat Oct 05, 2013 11:37 pm 
Newbie

Joined: Sat Oct 05, 2013 11:04 pm
Posts: 4
Hi, thanks for your reply, I have replaced the original alivio crankset with the current alivio fc m410. The original bb is a 113 mm spindle and 68 mm shell.


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 Post subject: Re: Bottom bracket help
PostPosted: Sat Oct 05, 2013 11:40 pm 
retrobike rider
retrobike rider
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Joined: Wed Apr 15, 2009 1:08 pm
Posts: 3118
Location: Woking
The threads will be the same, a Un26 68X113 will fit just fine. FC-M410 should be run with a 113mm axle.

SP


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 Post subject: Re: Bottom bracket help
PostPosted: Sat Oct 05, 2013 11:43 pm 
Retro Guru

Joined: Sun Aug 07, 2011 10:55 am
Posts: 2922
Location: Dorset
I have new unused UN26 for sale if you need one :)


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 Post subject: Re: Bottom bracket help
PostPosted: Sat Oct 05, 2013 11:50 pm 
Newbie

Joined: Sat Oct 05, 2013 11:04 pm
Posts: 4
I was more concerned about the fixed threaded side now being on the opposite side to the original and if it would cause any alignment issues.


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 Post subject: Re: Bottom bracket help
PostPosted: Sat Oct 05, 2013 11:57 pm 
Newbie

Joined: Sat Oct 05, 2013 11:04 pm
Posts: 4
@ widowmaker whats the spec of the UN26 you have and how much with P+P? PM me.


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 Post subject: Re: Bottom bracket help
PostPosted: Sun Oct 06, 2013 12:28 am 
Retro Guru

Joined: Sun Aug 07, 2011 10:55 am
Posts: 2922
Location: Dorset
brett wrote:
@ widowmaker whats the spec of the UN26 you have and how much with P+P? PM me.


PM incoming :)


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 Post subject: Re: Bottom bracket help
PostPosted: Mon Oct 07, 2013 12:19 pm 
Retro Guru

Joined: Sun Aug 07, 2011 10:55 am
Posts: 2922
Location: Dorset
Spec of BB = 68 v 122

Model: BB-UN26

Shell Width: 68mm

Spindle Width: 110 / 113 / 117.5 / 122 / 123


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