How to make L-track bike fork mounts

We’ve got L-track mounted in the floor of our van. It’s ideal for placing bike fork mounts pretty much wherever you need them. Here’s how to build your own fork mount that attaches to any piece of L-track on your floor or wall.

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All the ingredients you need for making the mount
All the ingredients you need for making the mount. Aluminum bar stock, one of the two L-track studs shown here, threaded knob, and elevator bolts.

The foundation of this design is a piece of 3″ x 6″ 1/4″ thick 6061 aluminum bar stock. Depending on the fork mount you buy and your preferred design, you might want to buy larger pieces of bar stock.

It fits into the L-track using L-track studs (or this style of L-track studs with a circular retainer, which might work better for you depending upon how much vertical height you need). The plate bolts down with a 3/8-24 threaded knob.

Two types of L-track stud which raise the mount up by different heights
Two types of L-track stud which raise the mount up by different heights

You can use the fork mount of your choice. Hollywood’s mounts have a suitable bolt spacing. If you have a through-axle, try this Delta model. Got a Cannondale Lefty fork? You can always use this Fork Up converter, but they aren’t cheap.

L-track fork mount with Cannondale Lefty ForkUp adaptor
L-track fork mount with Cannondale Lefty ForkUp adapter

You’ll also need bolts to attach the fork mount to the bar stock. The type you choose will depend on your L-track. If it’s completely recessed in the floor, you’ll want low-profile bolts like Elevator Bolts. On the other hand, flanged l-track is slightly proud of the floor. You can use regular bolt heads and they might provide just the right amount of spacing to keep the fork mount stable.

You’ll need nuts too. The elevator bolts we used are 1/4″-20 thread so some Nylock nuts like these would be fine.

Assembly

Drill the holes

First, work out where you’ll need to drill holes in your aluminum plate to fix the fork mount. Mark the holes along one edge of the aluminum.

Now, on the opposite edge, mark a location for the L-track stud and threaded knob to pass through. We went 3/4″ in from the edge, centered along the long edge of the aluminum.

Drill the holes for the fork mount bolts and the L-track stud. Clean the edges of the holes with a deburring tool.

Smooth the edges

Now clean up the edges of the aluminum. This makes it less likely that the piece will damage you while you’re using it. Also, paint adheres better to smooth edges than to sharp corners.

If you have a bench grinder, you can use that but even 80-grit sandpaper is enough to just take off the sharp corners and edges. After using 80-grit or the grinder, move to 120-grit to smooth out the finish.

We were in a rush to leave on a trip when we made the fork mounts in these photos, so they have very little finishing on their edges. All we really did was round the corners over to stop them from impaling someone.

You can paint the aluminum if you want. Sand the whole surface with 120 or even 200-grit sandpaper, clean it with detergent, rinse it, dry it well, and then prime with a primer that sticks to aluminum (this Rustoleum one works). After that, you can spray it any color you want.

Mount the elevator bolts

If you are using elevator bolts, they have a square area under the head that you’ll need to press into the aluminum. It helps if you drill the hole for the bolt slightly oversized, but still small enough that the square section under the bolt head doesn’t slide into the hole. Remember, the square part needs to bite into the aluminum so that the bolt doesn’t turn when you tighten the nut down on to it.

Put the bolt loosely in place, and cover the threaded side with a wrench socket that is longer than the threads.

Using a socket to press elevator bolts into aluminum bar stock
Using a socket to press elevator bolts into aluminum bar stock

Now put this in a vice and clamp it down, or if you don’t have a vice, tap the bolt head with a hammer.

Clamp the elevator bolt and socket in a vice or tap with a hammer to set the bolt
Clamp the elevator bolt and socket in a vice or tap with a hammer to set the bolt

This will press the square section of the bolt into the aluminum and hold it firmly.

Put it all together

Now it’s time to bolt down the fork mount and attach the L-track stud.

With the piece assembled, check that it doesn’t rock from side to side. If it does, you can glue shims on to the underside of the metal. We used some rubber mat, but plastic or metal shims would do just as well.

There's space under the aluminum plate. Use rubber or plastic to shim to the correct height
There’s space under the aluminum plate. Use rubber or plastic to shim to the correct height. We have a loose mat in our van that this plate rests on, so the shims in this picture are actually OK for our situation.

Using the fork mount

We’ve found that these fork mounts are super-useful. You can position them wherever you want and on whatever angle you want. They are much more flexible to use than if you’d just bolted the fork mount to a plank of wood.

If you wanted, you could drill holes for two L-track bolts to fix the mount more firmly, but we like the ability to turn the mount to any angle.

If we have friends’ bikes in the van, we can quickly move the mounts to accommodate their different setup. They also remove really fast, so if we need to use the van for some non-biking activity the mounts can get thrown in a plastic tub out of the way or just bolted to one of the wall mounted pieces of L-track.

2 Replies to “How to make L-track bike fork mounts”

  1. Nice! I did a very similar bike mount. Really inexpensive. The only difference is that I used a longer base plate with a couple of different mounting holes. We found that using a larger base plate allowed us to stagger handlebars. Particularly useful when mixing MTBs and drop bars (plus thru axle and qr forks), or trying to get four road/gravel/cx bikes in. But I love the smaller profile of yours! Very clean. I may have to revisit ours and see if I can cut down the base plate a bit.

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