Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-28-09, 03:21 AM   #1
Jim246
Member
Thread Starter
 
Join Date: Sep 2009
Bikes:
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bianchi Gold Race 100 bottom bracket

Dear All,

Hello from a long time lurker! I have a question regarding the bottom bracket on my Bianchi which I was hoping somebody can help me with.

The bike is a gold race 100 and around 9 years old. The BB clearly needs replacing, however I am struggling to find information on the parts. According to:

http://www.apibikes.com/htmlpages/bianchiroad.htm

the bottom bracket is a Thun cartridge and the chainset is a Tracer 212RD. The outer ring has six dimples and I think a Park tool will fit.

I would like to replace the part with a Shimano BB, does anyone know if this is possible and will I need a new crankset as well?

Cheers,

Jim
Jim246 is offline   Reply With Quote
Old 09-28-09, 06:08 AM   #2
joejack951
Senior Member
 
joejack951's Avatar
 
Join Date: May 2004
Location: Wilmington, DE
Bikes: 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i (RIP), 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2014 Islabikes CNOC 14 (son's)
Posts: 10,368
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 290 Post(s)
Based on your description of the 6 notch outer ring, it sounds like you have an adjustable cup and cone bottom bracket. I'd be a little surprised to find an adjustable cup and cone bottom bracket on such a modern bike but I guess it is possible. What does the non-drive side cup look like? Does it have 2 large flats? That would confirm my guess.

If I'm right, you have a square taper crankset and should be able to easily find a Shimano cartridge bottom bracket that will drop in and not require any other changes. Simply measure the spindle and get the same size as a replacement. Will you be doing the installation yourself?
joejack951 is online now   Reply With Quote
Old 09-28-09, 07:20 AM   #3
Steev
Senior Member
 
Steev's Avatar
 
Join Date: Jul 2005
Location: Backwoods of Ontario
Bikes:
Posts: 2,150
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Googling Thun bottom bracket brings up results for 6 notch BB tools like the low end Campy square tapers, which jives with the description of being a cartridge BB.
Makes me wonder whether you crankset uses a ISO taper, however, googling the crankset brings up some other bike specs that seem to use this crankset with Tiagra and Sora components which would be JIS taper.
Either way, you should be able to replace it with a Shimano unit and keep your crankset, but I'm too lazy to chase any further BB specs at this time.
The Thun cartridge should come out with a Park BBT4 tool or equivalent.
Steev is offline   Reply With Quote
Old 09-28-09, 07:25 AM   #4
joejack951
Senior Member
 
joejack951's Avatar
 
Join Date: May 2004
Location: Wilmington, DE
Bikes: 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i (RIP), 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2014 Islabikes CNOC 14 (son's)
Posts: 10,368
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 290 Post(s)
Not sure why I ignored the word "cartridge" in your description but if I had thought about it longer, my reply would have been more like Steev's.
joejack951 is online now   Reply With Quote
Old 09-28-09, 08:30 AM   #5
Jim246
Member
Thread Starter
 
Join Date: Sep 2009
Bikes:
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks guys-

that was helpful, sounds like I can move to a Shimano BB. To be honest the supplied chainset is rubbish but I recently found some nice TA rings, so I want to keep it for as long as possible.

The Park BBt4 looks ideal for the drive side, the other side has 20 notches. Will get the tools and try and get the thing out!

cheers,

Jim
Jim246 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 02:46 PM.