Bottom Bracket .. changing advice required

elyob said:

Okay, I'm fed up wth the noise coming from by bottom bracket and will change it before the London
to Brighton ...

I'm investigating bottom brackets and how to change. I have a crank puller, and can successfully
remove and refit the cranks. Once the cranks are off, how do you get the bottom bracket out? I've
not tried, as I like to know rather than bodge it.

Step 1. Buy the correct tool. (for the existing BB and the new one) Step 2. Spray WD40 liberally
over the old BB. Step 3. Get up early the next morning. Step 4. Check, check and recheck which way
you need to turn the damn thing Step 5. Remove the BB using GREAT FORCE. Step 6. It's now lunchtime.
Go out to the pub for a snack and celebration. Step 7. Liberally smear anti-seize lubricants over
the new BB Step 8. Insert the new BB making sure you don't cross thread it. Step 9. Tighten using a
lot of force Step 10. Enjoy.

(The BB I removed had plastic end caps at both ends and I had to resort to a stanley knife
and hacksaw and someone here actually had the temerity to state that plastic doesn't seize up
in the BB!)

Regards,

Tim.

--
God said, "div D = rho, div B = 0, curl E = - @B/@t, curl H = J + @D/@t," and there was light.

tjw.hn.orgtjw.hn.orgOpen ↗ locofungus.btinternet.co.uklocofungus.btinternet.co.ukOpen ↗

"Tim Woodall" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

elyob said:

Okay, I'm fed up wth the noise coming from by bottom bracket and will

change

Quoted message said:

Quoted message said:

it before the London to Brighton ...

I'm investigating bottom brackets and how to change. I have a crank

puller,

Quoted message said:

Quoted message said:

and can successfully remove and refit the cranks. Once the cranks are

off,

Quoted message said:

Quoted message said:

how do you get the bottom bracket out? I've not tried, as I like to know rather than bodge it.

Step 1. Buy the correct tool. (for the existing BB and the new one) Step 2. Spray WD40 liberally
over the old BB. Step 3. Get up early the next morning. Step 4. Check, check and recheck which way
you need to turn the damn thing Step 5. Remove the BB using GREAT FORCE. Step 6. It's now
lunchtime. Go out to the pub for a snack and celebration. Step 7. Liberally smear anti-seize
lubricants over the new BB Step 8. Insert the new BB making sure you don't cross thread it. Step
9. Tighten using a lot of force Step 10. Enjoy.

(The BB I removed had plastic end caps at both ends and I had to resort to a stanley knife and
hacksaw and someone here actually had the temerity to state that plastic doesn't seize up in
the BB!)

Thanks Tim. Am on the phone to my LBS at the moment 🙂 They charge £15 for the job, and that'll save
me messing it up, and having to buy the correct tools ... 🙂

"elyob" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Thanks Tim. Am on the phone to my LBS at the moment 🙂 They charge £15 for the job, and that'll
save me messing it up, and having to buy the correct tools ... 🙂

Not a bad idea if you don't need to replace BBs often. (I don't know what the quality differences
are twixt UN 40 and UN 52 but I do know that UN72's and UN73's have hollow shafts to lighten them
whereas the 52 doesn't.)

The advantages to DIY are obviously only buying the tool once, being able to do the job at your
convenience and most importantly being able to buy BBs from sources that may be cheaper than your
LBS. (Says he who went to his local LBS then H*lfords who both didn't stock the appropiate size then
went to next LBS who charged top dollar (well, pounds really) but was not in a position to argue).

To remove BB remove cranks, fit tool, re-fit crank bolts with washers to hold tool in place then
turn LH cup ccw to remove and RH cup cw to remove. Don't forget to remove crank bolts once the cups
start to turn. Re-fit new BB using PTFE tape or grease, preferably copper anti-seize stuff. If the
old 'un is seized follow the advice of the other poster :-)

Alson see: parktool.comFAQcartdg.shtmlOpen ↗

When going for your new bottom bracket take the old one or get the sizing code of the old 'BB' to
make sure you get the correct length. Thanks, John

"Tim Woodall" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

elyob said:

Okay, I'm fed up wth the noise coming from by bottom bracket and will

change

Quoted message said:

Quoted message said:

it before the London to Brighton ...

I'm investigating bottom brackets and how to change. I have a crank

puller,

Quoted message said:

Quoted message said:

and can successfully remove and refit the cranks. Once the cranks are

off,

Quoted message said:

Quoted message said:

how do you get the bottom bracket out? I've not tried, as I like to know rather than bodge it.

Step 1. Buy the correct tool. (for the existing BB and the new one) Step 2. Spray WD40 liberally
over the old BB. Step 3. Get up early the next morning. Step 4. Check, check and recheck which way
you need to turn the damn thing Step 5. Remove the BB using GREAT FORCE. Step 6. It's now
lunchtime. Go out to the pub for a snack and celebration. Step 7. Liberally smear anti-seize
lubricants over the new BB Step 8. Insert the new BB making sure you don't cross thread it. Step
9. Tighten using a lot of force Step 10. Enjoy.

(The BB I removed had plastic end caps at both ends and I had to resort to a stanley knife and
hacksaw and someone here actually had the temerity to state that plastic doesn't seize up in
the BB!)

Regards,

Tim.

--
God said, "div D = rho, div B = 0, curl E = - @B/@t, curl H = J + @D/@t," and there was light.

tjw.hn.orgtjw.hn.orgOpen ↗ locofungus.btinternet.co.uklocofungus.btinternet.co.ukOpen ↗

"Peter B" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

"elyob" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Thanks Tim. Am on the phone to my LBS at the moment 🙂 They charge £15

for

Quoted message said:

Quoted message said:

the job, and that'll save me messing it up, and having to buy the

correct

Quoted message said:

Quoted message said:

tools ... 🙂

Not a bad idea if you don't need to replace BBs often. (I don't know what the quality differences
are twixt UN 40 and UN 52 but I do know that UN72's and UN73's have hollow shafts to lighten them
whereas the 52 doesn't.)

On my Pine Mountain; UN 52, I wore out 2 in 1 year. UN72, it lasted 3 years of the same treatment -
buy XT; you know it makes sense.

John

"Eatmorepies" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

On my Pine Mountain; UN 52, I wore out 2 in 1 year. UN72, it lasted 3

years

Quoted message said:

of the same treatment - buy XT; you know it makes sense.

Yeah. My Rift Zone came with a UN72 and lasted just over 3 years, I've just replaced it with a UN73,
only one removable cup and it's plastic but hopefully the bearings and seals are of XT quality. I
think XT quality tapered BBs are getting like hens teeth so next time round it'll be full upgrade to
Octalink or ISIS. Assuming no new bike :-(

Pete

[email hidden] schreef ...

Quoted message said:

"Peter B" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

"elyob" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Thanks Tim. Am on the phone to my LBS at the moment 🙂 They charge £15

for

Quoted message said:

Quoted message said:

the job, and that'll save me messing it up, and having to buy the

correct

Quoted message said:

Quoted message said:

tools ... 🙂

Not a bad idea if you don't need to replace BBs often. (I don't know what the quality
differences are twixt UN 40 and UN 52 but I do know that UN72's and UN73's have hollow shafts to
lighten them whereas the 52 doesn't.)

On my Pine Mountain; UN 52, I wore out 2 in 1 year. UN72, it lasted 3 years of the same treatment
- buy XT; you know it makes sense.

Amazing: our first set of UN72s just left the tandem - after 20,000 kms!

--
Regards, Marten

Tim Woodall <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

(The BB I removed had plastic end caps at both ends and I had to resort to a stanley knife and
hacksaw and someone here actually had the temerity to state that plastic doesn't seize up in
the BB!)

It's not, in my experience, seizing that seems to be the problem with plastic BB cups, more the way
that they tend to crack and/or chew up the minute you try and remove them :-(

David E. Belcher

Dept. of Chemistry, University of York