[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks

  • Discuss [How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks in the BMX Bike Tech forum in area BMX-Forum Community; This thread should help alot of people switching cranks from 19mm spindles to 22mm Sticky maybe? this is for any cranks with a pinchbolt sorry i... ...
TheAzMyster

TheAzMyster

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #1
This thread should help alot of people switching cranks from 19mm spindles to 22mm
Sticky maybe?

this is for any cranks with a pinchbolt sorry i dont have expirience with 48 spline cranks but E RaK does
http://www.profileracing.com/news_full.php?id=409
heres a how to with 48 spline non pinch bolt cranks
Part 1: removing cranks
you will need;
allen keys
hammer (or a mallet if you have one)

Step 1:
this is probably the easiest part.
all we have to do is take the right sized allen key and unscrew the bolts, and take off the arms

Step 2:
take off all spacers and washers
place them in a container or somewhere close so they cant escape

Step 3
take a hammer (the bigger the head of the hammer the easier this will be)
just tap it on one side of the spindle till it comes out.
mallets work the best

note: tap it, dont hit it as hard as you can! you might miss and hit something else


Part 2: Removing Bottom Bracket
you will need;
socket wrench extension peice
hammer (or a mallet)

Step 1:
assuming you have a sealed bottom bracket get a socket extension peice and place it through your bottom bracket

Step 2:
tilt it up or down so that it hits the lip of your bearing

Step 2:
hit it with a hammer
if you have a mallet use it, you will be able to hit it harder and wont miss
the harder you hit the faster they come out

note: dont use an allen key or a screwdriver if you are keeping your bearings
it will wreck them, the socket extension works so much better as well

Step 3:
take out the tube spacer and do the other side
you will notice it easier because you can hit it straight


Part 3: replacing the bearings
now this is the part where you would take it to the shop
but i have a solution!
you will need;
G- clamp
old spacers or washers
a cone spacer

Step 1:
get 1 of your new bearings and hold it in the side of the BB that you want it in
put a cone spacer in the other side

Step 2:
put a spacer between the clamp and the bearing
and tighten it up

Step 3:
make sure the bearings go in evenly if not it will get stuck and its hard to get it out again

Note: untighten the clamp regularly to ensure the bearing goes in evenly
readjust the clamp if you have to but keep that spacer there at all times
i cant stress that enough

Step 4:
put the tube spacer in the other side and take out the cone spacer

Step 5:
put the other bearing in the other side and tighten with the g-clamp (remember the spacer! And on the other side aswell)
it also helps if you put the cone spacer in between the bearing you want to put in and the clamp
this way it goes in evenly

Note: make sure it goes in evenly!
And also check to see the tube spacer isnt stuck regularly
if it is get an allen key and tap it a few times it should loosen easy and drop back into place

Alternatively:
if you dont have a g-clamp like some may not
You will need;
an old spindle
2 washers
and 2 bolts that fit on the axle now remember that part!

Step 1:
put the tube spacer on the spindle
then put the spindle through your BB

Step 2:
put the bearings on ether side of the spindle
then so the same with the spacers

Step 3:
tighten the bolts up the spindle pushing the bearings into place
Note: dont be afraid if one bearing goes in first the other will soon follow


Part 4: replacing cranks
you will need:
Hammer (or Mallet)
allen keys

Step 1:
put the spindle through the bearings and tap it through with your hammer
Note: Tap it!

Step 2:
put on the new cone spacers and other spacers

Step 3:
put your sprocket on the new spindle

Step 4:
Put your new crank arms back on
and tighten all the required bolts
Note: Check that the arms are on the right side

Step 5:
check to see you have clearence on your chainstay
if not take of your arms and put down more spacers
and replace arms

Step 6:
put your chain back on and tighten it up
now go ride!


hope this helps :)
 
Last edited:
CodyPrince

CodyPrince

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #2
nice but check part two, there is a small mistake. rep+
 
P

paranoidmexican

Guest
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #3
awesome post, it really helped me out
 
L

Lue630

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #4
wow, i did all u did b4 on my own, didnt need a diy just figured it out but instead of going to the bike shop i just smashed my bearing in with a regular hammer lol. just greased it up, it stills works and i never had a prob, never really thought u had to go to a bike shop to put bb's in. lol.
 
Superbeast

Superbeast

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #5
Good how-to. I personally to put bearings in, made a bearing press out of an old unsealed axle, nuts, and 2 washers that were as big as the bearing. always worked perfect so for those of you who don't have money for an actual bearing press or a G clamp as he called it i guess, use an old unsealed axle. Like something from a front or back wheel of a walmart bike.
 
B0N0

B0N0

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #6
is it bad that i run my bearings with out that little tube thing ? lol
 
TheAzMyster

TheAzMyster

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #7
nice but check part two, there is a small mistake. rep+
sorry it was late at night when i did this and i was shit tired

Good how-to. I personally to put bearings in, made a bearing press out of an old unsealed axle, nuts, and 2 washers that were as big as the bearing. always worked perfect so for those of you who don't have money for an actual bearing press or a G clamp as he called it i guess, use an old unsealed axle. Like something from a front or back wheel of a walmart bike.
i put an alternative to using a g-clamp underneath step 3 using an old axle
and i dont have a bearing press. i use a g-clamp which is normally used to hold stuff down on a table or a workbench
like a handheld vice




its good to hear i helped people
 
CodyPrince

CodyPrince

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #8
i was awake when you did it lol.
 
Pickles

Pickles

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #9
GClamp,thats funny

*cough* C CLAMP *cough*

anyway,its good but it needs pictures. I know what youre talking about,so I could follow,but someone who needs this guide,doesnt really see it all. Pictures would help them actually get it.
 
E RaK

E RaK

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #10
what about removing and replacing 48 spline cranks
 
TheAzMyster

TheAzMyster

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #11
its all the same process for 48 spline isnt it?
i havent had any expirience with them

italian im pretty sure its G well thats what i have been told over and over again
i dont have a working camera at the moment so i cant take photos sorry
 
E RaK

E RaK

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #12
TheAzMyster

TheAzMyster

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #13
ok i dont have the time to summarise all that so il put it in a quote
 
johnuk

johnuk

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #14
is it bad that i run my bearings with out that little tube thing ? lol
If they're the kind with crank bolts on the ends of the spindle that hold the arms on from the sides (like Profiles), yes it is. If they just use pinch bolts to hold them, it's not so bad.
 
agExx

agExx

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #15
hey great how to and +rep.
 
highrider420

highrider420

New Member
[How-To] Removing and replacing Mid or Spanish Bottom Bracket and cranks post #16
You do know you can install press fit bearings with a rubber mallet alone if you grease the bb shell and the outer race of the bearings.

My fly bb fit in my fly frame no issues. Tapped out with no issues as well.

My american bb in my t1 went in and out with ease too. Lube makes everything better.
 

New Topics

Top