Bottom Bracket Help
 

Hey guys,

I am having a hard time trying to figure this out. I am trying to replace my entire groupset on this bike to make it more cyclocross ready. 1x in the front and what not. But for the life of me i can not figure out what type of bottom bracket will fit. Will a BB30 work on this frame?

Bike:
https://www.focus-bikes.com/media/yo...ISC_TIAGRA.pdf

Thank you for helping me out

The link that you provided from the manufacturer does not include what type of bottom bracket is used or supplied with the bike. However just by looking at it, most likely not a BB30, since it uses a Shimano crankset. Shimano does not have a BB30 compatible crank, there are aftermarket bottom bracket adapters that will go from 30mm to 24mm for Shimano cranks, for example like the one made by Wheels Manufacturing. Shimano's own pressfit system is BB86 or BB92.

Have you tried emailing/calling Focus and asking them directly? But, just from the picture, in my experience I would say that the bike does not use BB30 bottom bracket, purely because it uses Shimano cranks.

My guess; [From Limited information provided]
Remove the left crank arm , pull the tube spindle thru the external bearing BB,
it's tubular spindle is attached to the fight crank arm,

then unscrew the bearing holding portions from the frame ..

You can buy all the specialty tools, or have a shop do it for you..

you may, or may not, be able to use them again ..

for installing your replacement choice..
But really, for this
replace the outer chain ring with a disc bash-guard,
remove the FD,
and put a chain minder on the seat tube and you have a 1 by cross crank..

you could just use 46-36 chainrings and not go 1 by.

wear out what you have..

work on technique .. getting on and off at speed..

your courses have XC running too?



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I'd guess a standard tiagra external BSA threaded BB like this.
Shimano Tiagra 4700 Bottom Bracket | Chain Reaction Cycles s4yKqnNt7_dc pcrid 253659801802 pkw pmt prd 499594US

https://www.bikeradar.com/us/gear/ar...rackets-36660/

I'd suggest you take a look and compare to the guide

https://www.bikeradar.com/us/road/ge...-3-0-15-48939/

Shimano Hollow Tech 2 under specs 2nd line down.