What Size BB do I need ?

Prawnboy

Hi,

I have aquired a Kona Roast (aprox 2006) frame, it came without a BB installed so I can't simply measure the old one.

How do I establish what size BB I need ? I'm not sure how you determine the correct axel length to use.

I plan to fit a standard 3 cog crankset it that helps....

Thanks

Andy B

Measure the BB shell width, it will be 68 or 73mm, which gives you one BB measurement & What chainset?

nicklouse

measure the shell.

axle length is crank set specific.

Just buy some deore HT2 cranks and they will fit.

Prawnboy

Cheers for reply guys, shell width is 68mm, crankset will be something similar to below

http://www.chainreactioncycles.com/Mode ... delID=7607

Would prefer some deore HT2 cranks, but i'm putting this bike together on a serious budget. So I got the one measurement, just need an axel length now.

Cheers guys.

nicklouse

Prawnboy wrote:

Cheers for reply guys, shell width is 68mm, crankset will be something similar to below

http://www.chainreactioncycles.com/Mode ... delID=7607

Would prefer some deore HT2 cranks, but i'm putting this bike together on a serious budget. So I got the one measurement, just need an axel length now.

Cheers guys.

similar too is no good need to know exactly.

and what fitting etc..

Pics of YOUR cranks?

supersonic

You will need to contact CRC for the axle length needed for that chainset. Or find the manufacturer website.

Prawnboy

nicklouse wrote:

Cheers guys.

similar too is no good need to know exactly.

and what fitting etc..

Pics of YOUR cranks?

Will defo be those cranks, will be square Taper.

Had a look on FSA website, but couldn't even find the model listed :oops:

Prawnboy

Sorry to be a pest, I've tried calling CRC all day, but they are constantly engaged. Anyone got an idea on the Axle length to suit those cranks ? X

supersonic

Can't find any info on RPM cranks unfortunately.