Specialized Tarmac

[Groovejet]

Hello all,

I was looking to replace the BB on my 2010 Specialized Tarmac. I found some description on the BB that reads BC1.37x24. All I know is its a BB30 external bearing type. I wanted to install a ceramic BB from first components but not sure what size to order. Going to pair it up a Shimano Ultegra 6700 Crank. Any help would be great.

[Bill]

MAybe this will guide you in the right direction!
http://www.bikeforums.net/archive/index.php/t-298772.html
http://weightweenies.starbike.com/forum/viewtopic.php?t=41819

[kayelen]

Hi - did you ever figure out if its Enlish and what the measurement is (68mm vs 73mm)?

Thank you.

(04-08-2011, 07:54 AM)Groovejet Wrote:  Hello all,

I was looking to replace the BB on my 2010 Specialized Tarmac. I found some description on the BB that reads BC1.37x24. All I know is its a BB30 external bearing type. I wanted to install a ceramic BB from first components but not sure what size to order. Going to pair it up a Shimano Ultegra 6700 Crank. Any help would be great.

[bobtravers]

English thread for sure, it's a Specialized!!!

30mm x 42mm x 7mm i what your looking for... Usually BB30 bearing is a 6806 you gant order at any bearing shop...