Go Back  Bike Forums > Bike Forums > BMX
Reload this Page >

new crank help.

Notices
BMX Dirt, vert, flatland or street? Drop in the BMX forum to talk to other 20" riders around the world. What is the best BMX bicycle for you? Learn all about it here.

new crank help.

Old 07-28-04, 10:29 PM
  #1  
harobmx982
Junior Member
Thread Starter
 
Join Date: Jul 2004
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
new crank help.

i gotta bunch of new stuff for my bike *haro mirra 540 air* and im having trouble getting the barrings out to put in the new ones in, and i wanna do it without damaging them to much.. ne ideas?
harobmx982 is offline  
Old 07-29-04, 12:47 AM
  #2  
BiKe_GuY666
Flantlander^
 
Join Date: Jun 2004
Posts: 120
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
There in the crank? Well I wouldnt see a reason why they shouldnt come out. If there stuck against the cup as we call it then you must have done something pretty bad.
BiKe_GuY666 is offline  
Old 07-29-04, 07:17 AM
  #3  
harobmx982
Junior Member
Thread Starter
 
Join Date: Jul 2004
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
i took a nice bash on the side of the bottom bracket, but its not bad enough to effect they way they come out
harobmx982 is offline  
Old 07-29-04, 09:01 PM
  #4  
BiKe_GuY666
Flantlander^
 
Join Date: Jun 2004
Posts: 120
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Have you tried to get some grease in-between the "cup" and the berrings? Try that.
BiKe_GuY666 is offline  
Old 07-30-04, 12:18 AM
  #5  
BMXTRIX
Senior Member
 
BMXTRIX's Avatar
 
Join Date: Jul 2004
Posts: 1,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Bearings are removed with the cups at the same time. Typically you take a long screwdriver and stick it through one bearing and put it on the edge of the cup on the opposite bearing, then beat the hell out of it with a hammer. It takes a lot of force, and you need to work the screwdriver around the entire bearing cup, but it will soon loosen, and then the cup will pop out.

Then flip the frame over, and use an old seatpost or piece of pipe to remove the other bearing/cup combo.
BMXTRIX is offline  
Old 07-30-04, 02:07 AM
  #6  
BiKe_GuY666
Flantlander^
 
Join Date: Jun 2004
Posts: 120
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If he needs to beat the hell out of it then me will most likely damage which he said he didnt want to do.
BiKe_GuY666 is offline  
Old 07-30-04, 08:38 AM
  #7  
harobmx982
Junior Member
Thread Starter
 
Join Date: Jul 2004
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
hmm... ok theres a new twist, these arnt normal 2 piece bearing/cup set. its like a long sleeve..
harobmx982 is offline  
Old 07-30-04, 07:54 PM
  #8  
BMXTRIX
Senior Member
 
BMXTRIX's Avatar
 
Join Date: Jul 2004
Posts: 1,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by BiKe_GuY666
If he needs to beat the hell out of it then me will most likely damage which he said he didnt want to do.
If you don't know what I am talking about then please don't comment on what I say.

The way listed above is the way to do it.

The sleeve is a spacer that isn't attached to anything and should be able to be 'pushed' out of the way with a screwdriver. It isn't actually connected to anything and once one of your bearings/cups is knocked out, then that spacer will fall out. The spacer is used so that when you tighten down on your crank arms against the bearings from the outside, it pushes back on the bearings from the inside. It sits on the spindle of your cranks and 'floats' between the bearings. The pressure on that sleeve should not be so great that you can't push it out of the way.

When hammering the cups/bearings out, just a reminder to make sure the screwdriver is against the CUP, not the bearing. The outer edge is all cup, so as long as you have a pretty good angle on your screwdriver you are likely on the bearing. The inside of your bottom bracket is totally smooth, so if you put the screwdriver in with enough angle to hit the inside steel of the bottom bracket, then slide it across, you are hitting your cups, and not the bearing, and can hammer away.

In 17 years of riding, this is how bike shops have removed them for me, and how I have removed them myself, and I have yet to damage a bearing - and I have always been careful about it.
BMXTRIX is offline  
Old 07-31-04, 08:46 PM
  #9  
Gack_Guy
Junior Member
 
Join Date: Jul 2004
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
if you got new ones... are the old ones worth keeping? what shape are they in?
Gack_Guy is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.