New chainset=new bottom bracket?
bluemoon17
Posts: 718
Just a quick question about whether I need a new bottom bracket.
About to purchase a Shimano 105 Compact chainset to replace the stock one that came on my Allez. My current bottom bracket is one of these: http://www.chainreactioncycles.com/shimano-un26-square-taper-bottom-bracket/rp-prod34652.
Do I need to purchase a Shimano 105 bottom bracket (http://www.wiggle.co.uk/shimano-105-5700-bottom-bracket-cup-set/) as well?
Many thanks.
About to purchase a Shimano 105 Compact chainset to replace the stock one that came on my Allez. My current bottom bracket is one of these: http://www.chainreactioncycles.com/shimano-un26-square-taper-bottom-bracket/rp-prod34652.
Do I need to purchase a Shimano 105 bottom bracket (http://www.wiggle.co.uk/shimano-105-5700-bottom-bracket-cup-set/) as well?
Many thanks.
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Comments
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Yes, you'll need a hollowtech II BB. Doesnt have to be 105, you can either pay less (and buy 4600) or more (6800, etc)0
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I have the 105 5700 compact myself and I use the 105 10 speed chain and 105 5700 hollowtech II bottom bracket which is just £9.99 delivered from CRC, and you can fit it and forget it without ever worrying about creaking or dry bearings like you get with bb30.This serious internet site..............I serious cat0
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Jon_1976 wrote:Yes, you'll need a hollowtech II BB. Doesnt have to be 105, you can either pay less (and buy 4600) or more (6800, etc)
Thanks very much. How easy a job is it to swap out the old bottom bracket and chainset and put the new ones on? Any specialist tools required?0 -
Its a pretty easy job. I got my lbs to remove the square taper cranks and BB. I didnt want to buy the relevant tools as they'd only get used once. If you plan on doing it, you'll need a crank puller and the the appropriate BB removal socket/wrench.
Fitting hollowtech II is super easy. All you need:
5mm allen key
one of these http://www.merlincycles.com/shimano-tlf ... 57089.html
and http://www.merlincycles.com/shimano-tlf ... 44480.html
or
alternatively one of these http://www.merlincycles.com/icetoolz-ho ... 44746.html
EDIT:
in case you want to remove the square taper yourself, you'll need:
http://www.merlincycles.com/icetoolz-cr ... 44501.html
and
http://www.merlincycles.com/shimano-tl- ... 44486.html I'm 99% certain this is the correct socket. You'll need a ratchet/breaker bar.
Iirc, my lbs charged me £10 to remove the cranks and BB.0 -
Ok, thanks for the help!0
