Worn-out DU bushings are never a good sign on a full-suspension mountain bike. When you can feel play in the mounts that hold your rear shock onto the bike, that's when you know your DU bushings are worn out. The good news is that most bike shops anticipate this and keep a supply of DU bushings for major manufacturers, such as Fox. The downside is that extracting and installing DU bushings requires some specialised equipment that few people have at home.
- Skill level:
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Things you need
- DU bushing tool
- New Fox DU bushings
Remove the reducer bushings from the shock's eyelet -- the hole where the shock's mounting bolt goes for attachment. You can probably pull out these bushings by hand, but if you can't, use the vice to hold the bushings while you pull out the shock.
Place your DU bushing tool on a hard, flat surface, like a workbench. Take the eyelet of your shock and push it onto the DU bushing tool. The tool should grab the DU bushing in the eyelet and push it outward, removing it from the shock. Do this for both the top and bottom eyelets.
Place a new bushing onto the tapered end of the bushing tool, which should be placed facing the shock's eyelet. Push the bushing into the eyelet so it has a purchase. Then, place the whole assembly into the vice and close the vice until the bushing tool has pushed the new bushing all the way into the shock eyelet. Remove the bushing tool from the eyelet and repeat the process for the other eyelet.
Use you hands to push the reducer bushings into the new DU bushings. You can use the vice to ensure they are flush, if necessary. Alternate between pushing in each side slowly to ensure they are equally and evenly within the eyelet.
Tips and warnings
- Do not grease any part of the DU bushings.
- While installing the reducer bushing, avoid scratching up the inside resin of the new DU bushings.
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