Borked bottom bracket
Kieran_Burns
Posts: 9,757
Arsebiscuits.
While cleaning the chain, adjusting the brakes and sorting out the gear change last night I noticed this weird soft crunchy noise coming from the bike every time I turned the crank.
Hmmmm..... :?
Listening closely - well not that closely it was pretty obvious :roll: and then actually registering what it felt like, I realised the bottom bracket is knackered on my Tricross.
Now, having never needed to replace anything beyond the chain (my fault) on my trusty steed, I don't know which one to get.
Help?
What's a suitable BB for a Tricross Sport?
In other news: my rear wheel is seriously (ish) buckled - you'd have thought my mate (who spends the entire journey cycling in 'together' wheel sucking) would've mentioned that my rear wheel resembles a pringle in shape.
So that's off down to the LBS as well
While cleaning the chain, adjusting the brakes and sorting out the gear change last night I noticed this weird soft crunchy noise coming from the bike every time I turned the crank.
Hmmmm..... :?
Listening closely - well not that closely it was pretty obvious :roll: and then actually registering what it felt like, I realised the bottom bracket is knackered on my Tricross.
Now, having never needed to replace anything beyond the chain (my fault) on my trusty steed, I don't know which one to get.
Help?
What's a suitable BB for a Tricross Sport?
In other news: my rear wheel is seriously (ish) buckled - you'd have thought my mate (who spends the entire journey cycling in 'together' wheel sucking) would've mentioned that my rear wheel resembles a pringle in shape.
So that's off down to the LBS as well
Chunky Cyclists need your love too! :-)
2009 Specialized Tricross Sport
2011 Trek Madone 4.5
2012 Felt F65X
Proud CX Pervert and quiet roadie. 12 mile commuter
2009 Specialized Tricross Sport
2011 Trek Madone 4.5
2012 Felt F65X
Proud CX Pervert and quiet roadie. 12 mile commuter
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Comments
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Some cheapo boggo ordinary Shimano £15 jobbie will do it I'm sure. I've had a good 7000 miles out of the one in my Dawes so far - out in all weathers and no attention paid to it.Faster than a tent.......0
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If the info on the Specialized website is correct for your particular bike, it lists the BB of the Tricross sport as being a "BB-7420"which seems to be a fairly ordinary square taper item. Just make sure you get the right width and thread
This sort of BB lasts a very long time usually, but maybe you've been unlucky
The price of the part is what Rolf said
To fit this type of BB you need a special splined spanner and maybe a crank extractor but it's not difficult0 -
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I've just confirmed it's the BB-7420 and yup it's a square taper BB
As to replacing the bearings - I can't even see how to get into the thing. Oh, and this is the original BB that's gone through 2 winters on my 2009 model Tricross so it's done pretty well.
I've got the spline tool and crank extractor, so there's no problem getting it out. I just need to know what to replace it with.Chunky Cyclists need your love too! :-)
2009 Specialized Tricross Sport
2011 Trek Madone 4.5
2012 Felt F65X
Proud CX Pervert and quiet roadie. 12 mile commuter0 -
spec says 68x103mm, would this http://www.wiggle.co.uk/token-tk867-iso ... m-bracket/ (68x102mm be okay?)
edit: http://www.bikeradar.com/forum/viewtopic.php?p=16171942
saysFor future reference the BB on the 2009 specialized Tricross Triple is 68x118mm
Okay - now I am confused!!!!Chunky Cyclists need your love too! :-)
2009 Specialized Tricross Sport
2011 Trek Madone 4.5
2012 Felt F65X
Proud CX Pervert and quiet roadie. 12 mile commuter0 -
I just looked at the Evan spec sheet, which is a CTRL+C, CTRL+V from the Specialsed webby and they quote 103mm which is the same size that I'm using in my SS Tricross, ignore it, 103mm will work but the chainset might rub Go with the 118 or ask in a Specialised dealer but get it elsewhere.I've added a signature to prove it is still possible.0
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UndercoverElephant wrote:If it's a square-taper BB, are you not able to just replace the bearings and re-grease?
Only on really old school BBs with loose ball bearings. The cheapo Shimano square taper ones are sealed units and therefore 'disoposable' but at £15 a throw for a few years use, why not?1985 Mercian King of Mercia - work in progress (Hah! Who am I kidding?)
Pinnacle Monzonite
Part of the anti-growth coalition0 -
.. or take the cranks off and measure it. If you've got a vernier gauge that's easy.
I'm two months into a new extra cheap bottom bracket on my clunker
http://www.chainreactioncycles.com/Models.aspx?ModelID=22376
£5 and I've had 500 miles out of it so far.
Still if that's your best bike you might want something better than the cheapest thing available.0 -
Right after 3 trips ('cos Specialized don't even know the size of their own parts...) I can confirm it is a 6x118mm bottom bracket for the Tricross Sport
muttermuttermutter
However, after fitting bracket and glorying in my excellent fettling skills I noticed one of the spokes on the rear wheel has snapped.
Arse cheese.Chunky Cyclists need your love too! :-)
2009 Specialized Tricross Sport
2011 Trek Madone 4.5
2012 Felt F65X
Proud CX Pervert and quiet roadie. 12 mile commuter0 -
rjsterry wrote:UndercoverElephant wrote:If it's a square-taper BB, are you not able to just replace the bearings and re-grease?
Only on really old school BBs with loose ball bearings. The cheapo Shimano square taper ones are sealed units and therefore 'disoposable' but at £15 a throw for a few years use, why not?
Living in the past, me. I remember when all of this were just fields.0 -
God this is turning into a saga....
Remembered I had an old wheel with good spokes lying at the back of the garage. Spoke out, broken one removed and.... arse.
Rear wheel spoke gone so I need a cassette tool. I don't have one and can't get one 'til Monday.
All I want to do is ride my bike
Still - if the weather's good, this may be an excuse to get out on the Madone. Hmmmmmm.....Chunky Cyclists need your love too! :-)
2009 Specialized Tricross Sport
2011 Trek Madone 4.5
2012 Felt F65X
Proud CX Pervert and quiet roadie. 12 mile commuter0