Replacement of bottom bracket pressfit bearings with handmade tool!


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Introduction

This is an update of this norwegian article: Pressfit . The improvement is the cheap, simple, hand-made tool for pressing bearings into the frame with ease and without damaging bearings or frame.

This is the stuff you need (see figure number 2 and 3 for item 1 through 4):

  1. Nut x 2
  2. Washer that fits nut and old bearings x 2 (I did not have that so I used an additional pair of bearings.)
  3. The original, old bearings which you are replacing
  4. Long bolt (I used cut threaded bolt)
  5. Grease
  6. Calipers (skyvelær)
  7. Pliers

Remove old bearings

  1. Remove the non-drive-side crank arm
  2. Remove the drive-side crank arm
  3. Remove your old bearings by knocking them out from the opposite side (I use a screwdriver, this might however damage the bearings, but the will be replaced anyway)

Install new bearings

Follow the sequence below for an easy way to install new bearings:

Grease outer part of new bearing and install as straight as possible

Figure 1 – Grease outer part of new bearing and install as straight as possible.

Assemble one side of the pressfit tool

Figure 2 – Assemble one side of the pressfit tool. (do not use the hammer..)

Install tool in crank hole, tighten the nut and make sure the tool assembly is as straight as possible. Make sure that old bearing is totally aligned with new bearing on both sides

Figure 3 – Install tool in crank hole, tighten the nut and make sure the tool assembly is as straight as possible. Make sure that old bearing is totally aligned with new bearing on both sides.

Start tightening the bolts. I have knocked one side of the threaded bar to avoid the nut from spinning. Follow both sides by looking from above and make sure everything goes straight

Figure 4 – Start tightening the bolts. I have knocked one side of the threaded bar to avoid the nut from spinning. Follow both sides by looking from above and make sure everything goes straight.

Continue to press untill bearing is all the way in. For some models, like mine, the bearing goes into the frame

Figure 5 – Continue to press untill bearing is all the way in. For some models, like mine, the bearing goes into the frame. Do not overdo the force, it is better to open, check and start over.

check that both sides are equally pressed in by measuring with a caliper

Figure 6 – Check that both sides are equally pressed in by measuring with a caliper.

This is a caliper, you norwegian twats.

Figure 7 – This is a caliper, you Norwegian twats.

Disconnect tool and remove old bearings.

Figure 8 – Disconnect tool and remove old bearings.

Be proud, assemble the rest of your bike and get out!

Figure 9 – Be proud, assemble the rest of your bike and get out!

 

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