Instructables
The shop wanted $50 a wheel to change out the bearings. 

The internet wanted $60 for the tool to do it.

I knew there had to be a better way.

The official name for this tool is a 'mandrel bearing puller.'

 
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Step 1: Materials and Tools

Materials
1/2" Button head machine screw, at least 1 1/2" long, available at any hardware store
Flat head screwdriver with a somewhat large head and an impact resistant handle (this may get destroyed)


Tools
-Drill
-Hammer (any type, even a rock will do)
-File or belt sander to speed things up
-Hack saw, or band saw to speed things up
-Some sort of clamping device (vice)
-Safety goggles for power tools and hammering

Step 2: Shape the Head

Picture of Shape the Head
Mount the bolt in the drill chuck.

While the drill is spinning, use the belt sander or file to shape the head until it just fits through the inside of the bearing . Profile it to  have a narrow edge, like an umbrella. The edge allows the tool to fit into the chamfer (space between the bearing and spacer) to grip the bearing.

Step 3: Cut

Picture of Cut
Now cut the bolt lengthwise, through the head and down most of the shaft, leaving about 1/4" uncut.
I used a horizontal bandsaw, but a hacksaw and some elbow grease should do the trick.

Bend the two sides away from each other just SLIGHTLY by pressing the screw driver into the slot.


Step 4: Make a handle

Picture of Make a handle
This probably wasnt necessary, but I made a handle with a bolt, a lot of washers, and a nut. The tool threads into the other side of the nut.
markey19792 months ago

Amazing, I will definitely try this out in the future.....

This really works. I took a $0.99 carriage bolt, did the same, make sure you grind down the bolt head where it barely fits through the bearing, I couldn't get the first run to work, and it just got jammed and I thought I was screwed, so I hammered the bolt back through, and the side the screw driver was on came out instead, It doesn't matter which one comes off first. Thanks for the post
mtnvortex1 year ago
I also made an account just to say thank you. This is one of those things that is so simple, that once you see it, you wonder how you didn't think of it already. Thanks a lot, man. :-)
ntrizzle2 years ago
I made an account just to say THANKS! This saved me 40 bucks from taking it to a shop. I got a screw that was a little bit smaller than the baring inside diameter and cut it down the middle. Used a screw driver and hammer to get it out. I also used a bushing pull/press i bought for the control arm bushings on my M3 to push them back in. So thanks!
fred272 years ago
What's wrong with the standard technique of pushing the spacer to one side with the screwdriver and hammering the bearing out from the inside using a screwdriver directly on the bearing? I've done it loads of times. As long as you rotate the wheel after each tap it comes out evenly.
kylemoe fred272 years ago
There isn't always enough space to get a screwdriver (or a proper drift) between the spacer and the bearing.
chrisdp2 years ago
Brilliant! This can help with dismantling other tight fitting assemblies too.
dejavhu12 years ago
ufff eso si que es una verdadera muestra de ingenieria 10 estrellas
tholopotami2 years ago
I don't have a moto but clever ideas deserve a high vote!
mkarvonen2 years ago
very nice! 5 stars!!