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DIY Jig for Aligning the Fork

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DIY Jig for Aligning the Fork

Old 10-14-21, 08:54 AM
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rjhammett
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DIY Jig for Aligning the Fork

My '90ish Giordana Spica wanted to veer strongly to the left when riding. I tried the fork alignment that Sheldon had on his site without much success ( https://www.sheldonbrown.com/brandt/align-fork.html ). I decided to build my own jig to try to fix the fork. I built it using parts I had around the shop. I was able to straighten the blades so they were centered and was able to adjust the rake as measured at the dropouts. I used a hub with a mark in the very center and used a straight edge to measure down the center of the steerer to determine how much to adjust. After removing the hub I was able to bend the blades into the proper position. After making the adjustments I was able to ride with my hands off the bars instead of fighting to keep the bike going straight prior to making the adjustments.



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Old 10-14-21, 10:04 AM
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Cool. Can you describe how you bent the blades?
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Old 10-14-21, 10:30 AM
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Originally Posted by due ruote View Post
Cool. Can you describe how you bent the blades?
Pretty much brute force. To adjust the blade rake at the dropouts I put my foot on the board between the blades and pushed/pulled on the blade that needed adjustment. For the side to side I set the jig on it's side and pushed/pulled the blade that needed adjustment. I then reinstalled the hub and remeasured to make sure it was adjusted correctly.
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Old 10-14-21, 11:58 AM
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Originally Posted by due ruote View Post
Cool. Can you describe how you bent the blades?
Originally Posted by rjhammett View Post
Pretty much brute force. To adjust the blade rake at the dropouts I put my foot on the board between the blades and pushed/pulled on the blade that needed adjustment. For the side to side I set the jig on it's side and pushed/pulled the blade that needed adjustment. I then reinstalled the hub and remeasured to make sure it was adjusted correctly.
Your rig is similar to one I made up, u-bolts FTW.
I used a small jack to realign my blades, pushing on a bare axle I used in the dropouts.

Decided to add a picture of mine, though not in use. I needed more spacers to fit the jack (not pictured) underneath.
My blades were both bent back, and not easy to bend back into place. I had to overbend more than I expected to get them reset.

Last edited by Ex Pres; 10-14-21 at 03:29 PM.
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Old 10-14-21, 12:16 PM
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Originally Posted by Ex Pres View Post
Your rig is similar to one I made up, u-bolts FTW.
I used a small jack to realign my blades, pushing on a bare axle I used in the dropouts.
I was going to use U bolts but I found these in a junk box. The use of a jack would make it real easy. I was able to align the blades without too much trouble/force.
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Old 10-14-21, 01:09 PM
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Thank you! I have a couple of forks that need attention, and have been looking for a practical approach for a while.
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Old 10-14-21, 01:27 PM
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I was fortunate enough to have access to the park tools to align a fork but let me say this looks terrific. Really satisfying when no hands riding results!
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Old 10-14-21, 02:41 PM
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A gentleman I know builds his own frames and made this one that he lent me for my bent fork
Fork Jig 1 on Flickr
Fork Jig 2 wfork on Flickr
Fork Jig 3 wfork on Flickr
Fork Jig 4 wfork on Flickr

The two screws between the retainers are adjusted to be level and adjusted to the off-set desired. The fork is then placed on the "hub" and the steerer should be in contact with both screws.
This is not a tool for bending but to check the alignment.
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Old 10-18-21, 05:54 AM
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Originally Posted by rjhammett View Post
My '90ish Giordana Spica wanted to veer strongly to the left when riding. I tried the fork alignment that Sheldon had on his site without much success ( https://www.sheldonbrown.com/brandt/align-fork.html ). I decided to build my own jig to try to fix the fork. I built it using parts I had around the shop. I was able to straighten the blades so they were centered and was able to adjust the rake as measured at the dropouts. I used a hub with a mark in the very center and used a straight edge to measure down the center of the steerer to determine how much to adjust. After removing the hub I was able to bend the blades into the proper position. After making the adjustments I was able to ride with my hands off the bars instead of fighting to keep the bike going straight prior to making the adjustments.



Outstanding!
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