[zenmster]

I have a Shimano M760 XT bottom bracket and was removing it with a bottom bracket tool I bought from Performance Bikes. While trying to remove it the tool kept slipping and damaged the soft alloy. I'm going to replace it with a brand new one - does anyone have suggestions on how to avoid damaging it?

 

[alexrex20]

i wrap the cup with a heavy cloth and use a pipe wrench. i do have the correct tool, but my ghetto way causes zero damage to the shell.

why are you replacing the BB? any damage you did is purely aesthetic, unless there's something you're not telling us.

 

[AL29er]

Use a socket style tool, something like this. Not a cheap tool, but you are unlikely to ever need another.

 

[mtnbiker72]

Use a socket style tool, something like this. Not a cheap tool, but you are unlikely to ever need another.

Well...until they change the design on us again

 

[zenmster]

Ya no kidding

thx for the link to the tool - going to return the bloody wrench. Replacing the BB because it's creaking a little. Have been riding it hard for 12 months - approx 75-100 miles a week.

Hope this will help.

 

[bad mechanic]

Have been riding it hard for 12 months - approx 75-100 miles a week.

Don't replace the bottom bracket, replace the bearings. Install either $15 Enduro (my recommendation) or Phil Wood bearings and don't worry about it again.

Um...your BB shell is faced, right?

 

[customfab]

i wrap the cup with a heavy cloth and use a pipe wrench. i do have the correct tool, but my ghetto way causes zero damage to the shell.

Man does that sound sketchy, sure as hell wouldn't try that on a pretty king anodized BB. If you have the right tool what is your reason for using the money wrench?

 

[zenmster]

We'll its got a number of groves in it that the wrench fits into. What size bearings are these? Do I replace only the two collars that fit into the frame or?

 

[bad mechanic]

What size bearings are these? Do I replace only the two collars that fit into the frame or?

No, they replace the bearings the BB bearings cups hold. The cups are the things which actually thread into the frame, and the bearings are hidden behind the black plastic cap. The stock bearing is a 6805, which has a size of 25x37x7. The Phil Wood is a very high quality 6805 with much better seals, while the Enduro is a custom bearing with size 24x37x7, which allows it to use bigger balls and do away with the plastic axle shim.

Sooooo...is your shell faced?

 

[CharacterZero]

Don't replace the bottom bracket, replace the bearings. Install either $15 Enduro (my recommendation) or Phil Wood bearings and don't worry about it again.

Um...your BB shell is faced, right?

if he botched just backing out the shell, how do you expect him to replace the bearings and do it right? crapshoot, imo.

no offense OP

 

[bad mechanic]

if he botched just backing out the shell, how do you expect him to replace the bearings and do it right?

Ooooooooor he could let his LBS change the bearings for him.

 

[CharacterZero]

Ooooooooor he could let his LBS change the bearings for him.

We are assuming the original BB bearings are shot then? Maybe he was just trying to remove one side of the BB to install a BB-based chainguide or something (a la stinger).

I have replaced mine with the Enduros...had to wait on the LBS to get the tool in.

 

[zenmster]

you mean I shld ignore that warning note on the collar that says "do not disassemble?" LOL. How many bearings should I get?

 

[zenmster]

Grease?

BTW, I only have this stuff

Park Tool PPL-1 PolyLube 1000 Lubricant

Assuming it's ok to repack the bearings with:eekster:

 

[bad mechanic]

We are assuming the original BB bearings are shot then? Maybe he was just trying to remove one side of the BB to install a BB-based chainguide or something (a la stinger).

Because he said he was changing it because it started creaking after 12 months?

 

[CharacterZero]

Because he said he was changing it because it started creaking after 12 months?

heh, yep. I see that now.