BB90 crank on a Rock Lobster

richard2

I have a rock lobster team tig sl which takes a threaded bottom bracket.
I am hoping to fit a FSA K-force light crank to it, which is BB90. The bottom bracket I currently have is a race face hollowtech one, but I can't get the FSA crank into it (its possible it would go with a little hammering bit would be very tight!)
Can anyone recommend me a threaded bottom bracket that would take a bb90 crank?
Many thanks
Richard

majormantra

You don't mean BB90. BB90 is a Trek BB standard that accepts a range of 24mm spindle cranks. Presumably you have a MegaExo crank then? In which case you want a MegaExo threaded bottom bracket.

warpcow

Or do you mean BB30? In which case, no it won't fit.

majormantra

He said it almost fit into a Hollowtech BB, so I don't think it could be a 30mm spindle.

warpcow

Oops, missed that bit. There've just been a few threads with people who bought CRC's cheap stock of BB30 K-force Light cranks without realising exactly why they were cheap.

richard2

The spindle is about 113mm long and by my measurements is 24mm wide. It just seemed so tight. I couldn't get it on at all with the bottom bracket installed in the bike. I then removed one side of the bb and managed to get it on the spindle with a lot of pushing, but had to tap it off again with a hammer it was so tight.
Both crank arms have 'BB90' printed on the inside, plus a 1.6mm washer that says 'BB90-95'.
Is it a case of using a hollowtech bottom bracket and tapping it in with a hammer?! Or try one of the mega evo ones?
Thanks for prompt replies.
Richard

majormantra

If you think it's MegaExo, that's what I'd buy. The standard is very similar to HTII and for all I know it may be possible to make it work but if it were me I'd just buy the correct BB.

Actually, just found this: http://weightweenies.starbike.com/forum ... hp?t=54460

Useful?