Bicycle Mechanics - Bottom Bracket is stuck and will not come out.

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davidmigl
05-19-09, 01:16 PM
The bottom bracket on my Diamonback Wildwood w/ shimano sealed cartridge won't budge. I have removed both cranskets and tried adjusting it on both sides. I laid the bike on its side, inserted the bottom bracket tool into the splines, stepped on it with most of my weight to keep it from coming out, attached a 12" wrench to the bb tool, and pounded the end of it with a hammer. The most that happens is either the tool pops out of the splines or the adjustable wrench gets loose around the bb tool.

I don't remember it being this difficult last time I adjusted my bottom bracket (~6 months ago). How can I get it to come out?

bikeman715
05-19-09, 03:58 PM
are you turning the right direction ? the drive side clockwise the non drive side counterclockwise.try some oil and wait for awhile before you try again. or try some heat. when it does come out put some grease on the treads. so it be easier the next time.
AEO
05-19-09, 04:32 PM
some liquid wrench at the threads? it might be rusted in place.

pckopa
05-19-09, 04:59 PM
One thing you may be able to try is securing the bb tool into the splines by bolting it to the axle (if it's long enough to permit this). You can then secure the bb tool in a bench vise and use the frame as leverage. This method is excellent with cup&cone bb's since they allow you to use all manner of bolt/axle to secure the tool. Depending on the length of your cartridge bb axle (and the variations of nuts/washers available) this should help you get that tenacious sucker off of there.

Be sure that you're turning it the right way! This amount of leverage could seriously damage your frame.
gbg
05-19-09, 05:04 PM
Fixed cup tools
http://www.sheldonbrown.com/tooltips/bbcups.html

http://www.sheldonbrown.com/tooltips/images/bbtool-bolt.jpg


I take no responsibility if you reef on it like a gorilla and snap your frame in half!
davidmigl
06-01-09, 07:49 AM
Thanks for your help.

I was able to get it off by using a tool somewhat like this bought from my LBS:

http://www.parktool.com/images/products/productimages/spr_BBT-4B_2005810_58574.jpg

It allowed for an alternate method of removal.