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CAAD 4 R1000 Aero

Old 07-19-09, 12:43 PM
  #1  
djnzlab1
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CAAD 4 R1000 Aero

HI,
I am very new to bicycle ridding, I see some great deals on Ebay I was wondering how you know what size bottom bracket to buy for an older bike, its only says shimano 105 bottom bracket ,
the Crank is a SHimano Ultegra 39/53
any help would be great.
Link to bike at Cannondale com.

http://www.cannondale.com/bikes/00/ce/model-0RA1.html
Thanks again.
You guys have prevented more than one disaster.
doug
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Old 07-19-09, 12:54 PM
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Your Cannondale is threaded for a 68 mm wide English bottom bracket. A 105 crank will work with an Ultegra bottom bracket IF they are the same type, i.e. square taper OR Octalink OR external cup.

We need to know the model number of both the crank and the bottom bracket and the width of the bottom bracket spindle. There were numerous 105 and Ultegra cranks and bottom bracket types and designs and they aren't interchangable.

Please don't be offended but E-bay is not the place to be purchasing bicycle components unless you know exactly what you need.
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Old 07-19-09, 01:05 PM
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djnzlab1
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well I visited sheldon Browns web page

HI,
Sheldon Browns webpage:
here's what the page said.105 5501 Double 109.5 V1 Spline 43.5 130 Hollowtech, 2001-02

Octalink V1 Spline: 9 speed BB-M952 (XTR), BB-7700 (Dura-Ace), BB-6500 (Ultegra), BB5500 (105)

looks greek to me...

Last edited by djnzlab1; 07-19-09 at 01:12 PM.
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Old 07-19-09, 04:02 PM
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Well that's because it's talking about two different standards, mentioning both Hollowtech (external bearings, spindle attached to spider) and octalink (internal bearings, spindle integrated with the bottom bracket)... so at least to me, that info doesn't mean anything.


If you can provide a close up of the bottom bracket and crankset (preferably left side) you should be able to determine what kind it is without dissasembling it. You could also bring it to your LBS and they can probably ID the type on-site.

Also know that replacing a bottom bracket takes several specific tools (more if internal) and sometimes some frame work done. The simplest way to do it is to give it to the LBS. It should not be a terribly expensive job, even after the cost of the replacement part.
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Old 07-19-09, 04:19 PM
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Originally Posted by djnzlab1 View Post
HI,
Sheldon Browns webpage:
here's what the page said.105 5501 Double 109.5 V1 Spline 43.5 130 Hollowtech, 2001-02

Octalink V1 Spline: 9 speed BB-M952 (XTR), BB-7700 (Dura-Ace), BB-6500 (Ultegra), BB5500 (105)

looks greek to me...
OK some translation:

The first line describes the crank as a 9-speed era 105 double (two chain rings) which requires a 109.5 mm Octalink V-1 bottom bracket. There are two Octalink standards and V-1 is used on the upper level road cranks and a couple of MTB cranks. The 105 takes the V-1. The 130 is the bolt circle diameter of the chainrings in mm and that's a very common size. The 43.5 mm is the chainline. Hollowtech was the Octalink design. Hollowtech II is the external cup design.

This crank takes the BB-6500 or BB-5500 in 109.5 mm spindle length and English threading.

So, if you get these from E-bay, do you know how to install them?
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