Replacing crankset and bottom bracket
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Replacing crankset and bottom bracket
Postby steve_hobart » Fri Aug 03, 2012 9:31 pm
I've never attempted this before though (however I am keen to learn) and just wonder if this is too ambituous a project for me to attempt.
Are there any helpful instructions or videos of how to do this?
Also, how I can I tell if my frame will accept the ultegra hollowpoint BB?
cheers
steve
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Re: Replacing crankset and bottom bracket
Postby Bentnose » Sat Aug 04, 2012 9:52 am
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Re: Replacing crankset and bottom bracket
Postby A_P » Sat Aug 04, 2012 10:34 am
You will need the shimano BB wrench at least, and some allen keys.
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Re: Replacing crankset and bottom bracket
Postby RonK » Sat Aug 04, 2012 11:32 am
What type do you have?
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Re: Replacing crankset and bottom bracket
Postby steve_hobart » Sat Aug 04, 2012 2:47 pm
The existing crankset is a gossamer megaexo 34/52t with integrated spindle.
I'll have a look on the website and see what bb I currently have...
The learning continues!
Cheers
Steve
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Re: Replacing crankset and bottom bracket
Postby RonK » Sat Aug 04, 2012 4:53 pm
As has been stated you will need the Shimano tool for the external bearings but you should be able to get one from a decent lbs for around $40.
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Re: Replacing crankset and bottom bracket
Postby steve_hobart » Sat Aug 04, 2012 5:18 pm
I'll probably change over to an ultegra rear cassette (from the 105) and Ultegra chain as well - then I guess there will be fron and rear derailur adjustments.....
I'll keep investigating and having a think about whether I should take this on myself...maybe a bit ambitious for me at this stage of my experience...
(STeve - the challenged mechanic!)
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Re: Replacing crankset and bottom bracket
Postby AndrewBurns » Sat Aug 04, 2012 5:30 pm
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Re: Replacing crankset and bottom bracket
Postby steve_hobart » Sat Aug 04, 2012 5:44 pm
Thanks for the encouragement. Actually my plan is to learn enough so that I don't have to keep going back to the lbs every time I need some adjustment...the lbs r really good but I feel silly going in every few months to get dereailur and brake adjustment when I should be able to do it myself... And I guess I'll eventually save money... Maybe even build my own bike one day....AndrewBurns wrote:Doing what you want to do is pretty easy, as has been stated if the chain and cassette have wear you may as well change everything at once because mixing parts with different levels of wear can cause shifting problems and accelerated wear of the newer parts. You will probably have to adjust the derailleurs slightly but that's easy as well. I say go for it, once you get it done you'll never have to go back to getting somebody else to look after your bike.
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Re: Replacing crankset and bottom bracket
Postby Stuey » Sat Aug 04, 2012 7:46 pm
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Re: Replacing crankset and bottom bracket
Postby Mulger bill » Sat Aug 04, 2012 8:22 pm
Apart from the parts and tools, you'll need grease, a couple of rags, some kero, coffee (during) and beer (after ).
YOUTUBE has plenty of how to vids to get you started. Feel free to ask here if you get stuck, there should be someone hanging around The Shed who can talk you through it
Let us know how you get on.
Shaun
London Boy 29/12/2011
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Re: Replacing crankset and bottom bracket
Postby steve_hobart » Sat Aug 04, 2012 11:01 pm
Is there only 1 ultegra chain that I should choose? Im also guessing that any of the ultegra rear cassettes would work?
cheers
Steve
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Re: Replacing crankset and bottom bracket
Postby AndrewBurns » Sat Aug 04, 2012 11:08 pm
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Re: Replacing crankset and bottom bracket
Postby bosvit » Sat Aug 04, 2012 11:15 pm
www.ribblecycles.co.uk
This is a great site for comparisons
http://frugalrouleur.com/
The advantage of buying from your lbs is they will more likely be willing to give you instillation advice, but is it worth the extra cost?
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Re: Replacing crankset and bottom bracket
Postby steve_hobart » Sat Aug 04, 2012 11:20 pm
I have been overwhelmed by the assistance offered by everyone, your willingness to help and your patience with a noob like me who is probably asking silly questions and trying to take on an overly ambitious project especially with my lack of knowledge and experience
thanks again
steve
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Re: Replacing crankset and bottom bracket
Postby Bentnose » Sun Aug 05, 2012 8:24 am
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Re: Replacing crankset and bottom bracket
Postby RonK » Sun Aug 05, 2012 10:42 am
As posted this is the length if the crank arm. Typically a road bike of around 56cm will have 172.5mm arms. Bigger frames may be fitted 175mm arms, smaller frames with 172mm arms. 165mm is a very short arm.steve_hobart wrote:Ive been having a look at the Wiggle web site..Not sure how I determine what axle length I need (165 mm etc) - I am assuming that this refers to axle length?
Is there only 1 ultegra chain that I should choose? Im also guessing that any of the ultegra rear cassettes would work?
cheers
Steve
Your current crankset likely has the length marked on the back of the arms.
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Re: Replacing crankset and bottom bracket
Postby steve_hobart » Wed Aug 22, 2012 11:43 pm
I have also retuned slightly the front and rear derailer.
I have never done any work on a bike before, so I am thrilled with the job, Everything went very smoothly - in fact it was a straightforward and relativey easy change that took 2 hours all up.
The bike is noticeably lighter and changes much more smoothly than my previous set up (which was a Gossamer compact crank, 105 rear cluster, 105 chain with Ultegra rear derailer. It is now running and changing gears very smoothly (in the work frame).
Looking forward to my first test ride this weekend.
I will post some progressive photos in the next few days.
Many thanks to all of you on the forum, "ZInn Road Bike Maintenance" and "Bicycle Tutor" (on line).
Cheers
Steve
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Re: Replacing crankset and bottom bracket
Postby AndrewBurns » Thu Aug 23, 2012 6:19 am
You can do almost anything to a bike with a few fairly cheap tools and the internet to guide you, I started riding maybe a year ago now and have never taken any of my bikes to a bike shop for repairs because I almost enjoy servicing them as much as riding them
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Re: Replacing crankset and bottom bracket
Postby RonK » Thu Aug 23, 2012 6:36 am
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Re: Replacing crankset and bottom bracket
Postby Releng » Sun Sep 09, 2012 9:16 am
Well done on the upgrade, a good example to build the confidence of all of us amateurs. And the thread is a good example of just how good this forum is.
Are you planning to offload the old crankset? It is just what I need for my commuter, I get down to Hobart quite often and would be happy to discuss adequate compensation. PM me if you are interested.
Mick
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