Bottom bracket - replacing
Discussion
From the spec sheet:
BOTTOM BRACKET
Power Spline Cartridge Sealed
CRANKSET
Truvativ ISO FLO, 42/32/22 with Power Spline interface
Anyone care to recommend some links to which tools I'll need?
I am slightly concerned with the removal process as one of my friends had serious problems getting his old one out. I guess it's a case of give it a go and if all else fails nip down to the LBS and get them to do it. I feel I should at least learn how to do everything on my bike
BOTTOM BRACKET
Power Spline Cartridge Sealed
CRANKSET
Truvativ ISO FLO, 42/32/22 with Power Spline interface
Anyone care to recommend some links to which tools I'll need?
I am slightly concerned with the removal process as one of my friends had serious problems getting his old one out. I guess it's a case of give it a go and if all else fails nip down to the LBS and get them to do it. I feel I should at least learn how to do everything on my bike
Edited by Moose. on Thursday 15th November 13:38
This is your BB http://www.chainreactioncycles.com/Models.aspx?Mod...
You will need a crank extractor http://www.chainreactioncycles.com/Models.aspx?Mod... and a bottom bracket removal tool http://www.chainreactioncycles.com/Models.aspx?Mod...
You will also need a large allen key (8mm) to undo the crank bolts holding each of the crank arms onto the bottom bracket.
There is a good link on the park tool website on how to remove the ISIS BB http://www.parktool.com/repair/readhowto.asp?id=12...
You will need a crank extractor http://www.chainreactioncycles.com/Models.aspx?Mod... and a bottom bracket removal tool http://www.chainreactioncycles.com/Models.aspx?Mod...
You will also need a large allen key (8mm) to undo the crank bolts holding each of the crank arms onto the bottom bracket.
There is a good link on the park tool website on how to remove the ISIS BB http://www.parktool.com/repair/readhowto.asp?id=12...
Many thanks for that
Moving on from the BB, I feel I may as well replace the chainset too and was thinking this should do the trick:
http://www.chainreactioncycles.com/Models.aspx?mod...
is it really worth paying another £25 for XT to save 74 grammes? Although the XT does look more Hmmm, decisions decisions
Moving on from the BB, I feel I may as well replace the chainset too and was thinking this should do the trick:
http://www.chainreactioncycles.com/Models.aspx?mod...
is it really worth paying another £25 for XT to save 74 grammes? Although the XT does look more Hmmm, decisions decisions
Moose. said:
Many thanks for that
Moving on from the BB, I feel I may as well replace the chainset too and was thinking this should do the trick:
http://www.chainreactioncycles.com/Models.aspx?mod...
is it really worth paying another £25 for XT to save 74 grammes? Although the XT does look more Hmmm, decisions decisions
The LX htII is a really good piece of kit. Note that Hollowtech II cranks come with an integrated, external bottom bracket and will require a different set of tools to fit than the ones you'll need to remove the old ISIS one.Moving on from the BB, I feel I may as well replace the chainset too and was thinking this should do the trick:
http://www.chainreactioncycles.com/Models.aspx?mod...
is it really worth paying another £25 for XT to save 74 grammes? Although the XT does look more Hmmm, decisions decisions
As to whether you should move up to XT, it's probably not necessary unless your bike's on a serious weight reduction programme but they do look a bit nicer! FWIW I run LX cranks on both my bikes and it seems bomb-proof.
I've been doing a bit of reading on the Park Tools website, so I know I'll need the Shimano wrench to fit the new crank:
http://www.chainreactioncycles.com/Models.aspx?Mod...
but I'm not sure if I need this:
http://www.chainreactioncycles.com/Models.aspx?Mod...
as I can't see any reference to it on the Park Tools website and was able to remove the cranks last night using an 8mm allen key
Sorry for all the questions, but it's the only way to learn
http://www.chainreactioncycles.com/Models.aspx?Mod...
but I'm not sure if I need this:
http://www.chainreactioncycles.com/Models.aspx?Mod...
as I can't see any reference to it on the Park Tools website and was able to remove the cranks last night using an 8mm allen key
Sorry for all the questions, but it's the only way to learn
The cranks may have had self extracting bolts which push the cranks off as you undo them, or they maynot have been on tight enough in the first place. Either way their off now so don't worry about it.
On the subject of cranks and chainsets - Wiggle and Chain Reaction were offering the Race Face Evolve XC at a very good discount. It comes with a BB to. The cranks are also compatible with Shimano HTII bottom brackets. I run one of these on my Stiffee and it's great. The rings are a lot more durable than Shimano ones. It also looks a lot better (imoho).
If you fit an external bb then you'll need to get the frame faced up if it isn't already. Your LBS can do this for about £10.
On the subject of cranks and chainsets - Wiggle and Chain Reaction were offering the Race Face Evolve XC at a very good discount. It comes with a BB to. The cranks are also compatible with Shimano HTII bottom brackets. I run one of these on my Stiffee and it's great. The rings are a lot more durable than Shimano ones. It also looks a lot better (imoho).
If you fit an external bb then you'll need to get the frame faced up if it isn't already. Your LBS can do this for about £10.
mk1fan said:
If you fit an external bb then you'll need to get the frame faced up if it isn't already. Your LBS can do this for about £10.
Was speaking to a mate about this over the weekend as he has HTII cranks and he too recommend I get the frame faced. So, I phoned 3 local bike shops for a quote to remove the old BB (I didn't bother buying the removal tools in the end, as I'd only use them the once) and face the frame:- bike shop number 1 - £8 to remove BB and £8 to face frame + clean up threads
- bike shop number 2 - didn't quote, as reckoned you don't need to face the frame
- bike shop number 3 - £20 to remove BB and reckoned you don't need to face the frame but could do for extra £10
So I think I'll go with bike shop number 1 (although it would be the one furthest away!) unless people reckon it's not worth facing the frame?
The reason for facing up a frame is to ensure that the two ends of the BB shell are square and flat. This is to allow the external bearing to be parallel to each other. Manufacturing standards are improving and top end frames don't tend to need facing but the mass produced frames do.
Essentially, if you don't have it done and the (external bearing type) BB fails then you don't have any warranty protection. Unless the shop who said you don't need to do it supplies and fits the BB at which point it's their liability.
£20 to remove a BB! I think I'll quit my job and become a bike mechanic!
Essentially, if you don't have it done and the (external bearing type) BB fails then you don't have any warranty protection. Unless the shop who said you don't need to do it supplies and fits the BB at which point it's their liability.
£20 to remove a BB! I think I'll quit my job and become a bike mechanic!
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