What do you know about Bottom Brackets
- mikesbytes
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What do you know about Bottom Brackets
Postby mikesbytes » Thu Jan 03, 2008 10:25 pm
Sticker on the BB says;
Power Pro
component
CARTRIDGE BB
7418ST
BC1.37x24T
L < 68 > R
099854
on the square taper is stamped A113
Any opinions on this BB ?
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Postby mikesbytes » Thu Jan 03, 2008 11:20 pm
It's squeaked ever since it was band new, squirting some oil in each side seemed to stop the problem temporarily and after a while you got use to the noise and ignored it. But it irritates other riders. Basically its a fault with that particular model, as I've seen it reported time and time again.europa wrote:In what way is it noisy? It could just be that you've worn the poor thing out. If you've had water in there you might have grit in there causing a grinding noise.
Richard
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Postby ez » Thu Jan 03, 2008 11:47 pm
Ez.
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Postby mikesbytes » Thu Jan 03, 2008 11:47 pm
Greased everything and put it back together. If it continues to squeak, I'll buy a new one rather than waste any more time on it.
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Postby mikesbytes » Thu Jan 03, 2008 11:57 pm
$30 is a bargain, can't get them that cheap mail order.ez wrote:I had a similar problem with a Power Pro BB, I just took it down to the LBS and purchased a new equivalent Shimano one for about $30.00. Of course the most impartant measurement is never on the bracket and that is the width of the thing from end to end, thats why you take the old one in(or measure it) when purchasing the new one.
Ez.
I suspect that "Power Pro BB" = <something I'd better not type>
I think its 113mm, based on the stampings. It is a triple and they are a little wider.
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Postby sogood » Thu Jan 03, 2008 11:59 pm
RK wrote:And that is Wikipedia - I can write my own definition.
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Postby sogood » Fri Jan 04, 2008 12:10 am
Could it be that there's something out of spec in terms of dimension eg. Cartridge BB? The other possibility is a bent axle.mikesbytes wrote:I could see wear marks in the cups and what appeared to be wear on the outside of the sealed casing.
RK wrote:And that is Wikipedia - I can write my own definition.
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Postby Mulger bill » Fri Jan 04, 2008 12:12 am
IIRC, 115mm is standard spindle length for a triple.
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Postby mikesbytes » Fri Jan 04, 2008 12:16 am
So A113 must refer to 113mmMulger bill wrote:I'd go for a new one Mike, the old one would be flogged out in the 4 odd years you've had your OCR.
IIRC, 115mm is standard spindle length for a triple.
Shaun
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Postby Mulger bill » Fri Jan 04, 2008 12:42 am
Shaun
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Postby europa » Fri Jan 04, 2008 9:43 am
That's what I'd do. After stuffing about with bbs a bit this year, the easy way is to walk in with a frame in one hand and a set of cranks in the other.Mulger bill wrote:Could be Mike Why not just take it to the LBS and ask for a replacement. At least it's not Italian threaded
Shaun
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Postby mikesbytes » Fri Jan 04, 2008 11:31 am
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Postby mikesbytes » Fri Jan 04, 2008 3:13 pm
Sealed Cartridge Unit
SHIMANO
BB-UN26
VIA SINGAPORE
68 FD
BC1.37x24
L<- D-NL ->R
and on the box is hand written 112.5
Think I can survive the 0.5mm reduction
Of more interest is that the thread on the (right) drive side is part of the unit rather than being a separate component, so the unit is fixed in better. On the (left) non drive side, there's a plastic threaded cup - interesting. BTW the bolts are going to be chucked they are simply hex bolts, I'll use the exisiting allen key ones with rubber washers, I've had nothing but trouble with hex bolts in the past.
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Postby sogood » Fri Jan 04, 2008 3:51 pm
Check out Sheldon Brown's page and the numerous tables. Maybe you can make something out of that. I am having difficulty.
http://www.sheldonbrown.com/bbsize.html
RK wrote:And that is Wikipedia - I can write my own definition.
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Postby LuckyPierre » Fri Jan 04, 2008 5:14 pm
ps. after another check, the UN26 comes in lots of other lengths too.
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Postby mikesbytes » Fri Jan 04, 2008 6:57 pm
1. Put the new BB in. Test ride - the squeaks still there UH!!!!!! OK, it still squeaks if I stand and it still squeaks if I ride no hands, it only squeaks when I pedal. I fix 2 other known squeaks, that being the seat post and the other being the steam, just to make sure that their noise is not confusing the issue.
2. Swap the pedals. Still squeaks. mmm, it might be a broken frame.
3. Inspect the frame carefully. No visible cracks. Can't be the cleats, as the don't squeak on the beast and the squeak has survived 2 pairs of pedals.
4. Ride with no shoes on, just to prove its not the cleats. OK whats left, it only happens with pedalling, only the chain and the rear wheel left.
5. Pull the rear wheel out, take off the cassette, try in vain to get to the sealed bearings. Grease the skewer. Put engine oil on every possible crack and seal. Reassemble and test. AND VOLA, the squeak has gone.
BTW, I don't feel bad about replacing the BB, it was crap from day one and had squeaking problems from day one (different rear wheel in those days), its done a stack of K's and was probably long in the tooth.
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Postby mikesbytes » Fri Jan 04, 2008 7:35 pm
Yip, it was coming from the rear hub when power was applied.sogood wrote:So what was the source of the squeak? Are you suggesting it came from the rear hub all along? Engine oil in the hub? It'll be a dirt magnet.
Your've heard the noise, sounded like bottom bracket didn't it.
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Postby sogood » Fri Jan 04, 2008 8:04 pm
RK wrote:And that is Wikipedia - I can write my own definition.
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