Fitting rigid forks begins with selecting a set that matches the frame design and steering headset diameter of the mountain bike. In addition, the new forks must have the appropriate mount for disc brakes or side-pull brakes. Rigid forks are less complicated to fit than suspension forks because there's only one headset connection instead of three. But it's important that you have the specialized tools to ensure proper installation. The average do-it-yourself mechanic can fit rigid forks on a mountain bike relatively quickly.
Fork Tube
Step 1
Secure the rigid forks in a bench vise with the fork tube extending horizontally from the vise. Wrap shop rags or a towel around the forks beforehand to prevent scratching the finish.
Step 2
Measure the length of the steering headset on the mountain bike to determine the length of the fork tube. Measure from the top lip of the headset to the bottom lip with a metric ruler and add the thickness of the new crown race. Transfer the measurement to the fork tube and mark the location for the cut.
Step 3
Slide the threadless saw guide onto the fork tube and secure it at your mark. Cut the tube with a hacksaw. Remove the saw guide and clean the burrs on the inner and outer edges of the cut with a round file.
Step 4
Screw the new star nut onto the end of the start nut tool. Position the nut at the end of the fork tube and hold the body of the tool with one hand. Drive the star nut fully into the tube, using a hammer to strike the outer end of the tool. Unscrew and remove the star nut tool.
Step 5
Apply lithium grease around the base of the fork tube. Slide the new crown race onto the tube and against the base.
Step 6
Slide the crown race setter on the tube and against the crown race. Install the slide hammer onto the tube. Set the crown race firmly in place by striking the end of the slide hammer with the hammer.
Fitting the Fork
Step 1
Apply lithium grease around the new crown race. Grease the bearings inside the headset.
Step 2
Insert the fork tube fully into the lower end of the headset and hold it in place with one hand.
Step 3
Insert the new washers and spacers into the top of the headset. Screw the new top cap onto the headset and tighten it with a metric wrench.
Tips and Warnings
- A novice should enlist the assistance and advice of a bike mechanic when selecting and fitting rigid forks.
Things You'll Need
- Bench vise
- Metric ruler
- Threadless saw guide
- Hacksaw
- Round file
- Star nut tool
- Hammer
- Lithium grease
- Crown race setter
- Slide hammer
- Metric wrench
Member Comments