I bought a used TiGr lock and it didn't come with the velcro straps to attach it to my bike frame, so i decided to make my own. As you might have noticed, i have a vintage steel-framed bike. If you have a modern bike with larger tubing, you might want to make the straps a little longer. Or maybe not; the lock doesn't hug my frame when attached, so slightly larger tubing wouldn't affect the reach of the straps. I held the lock on my bike and measured around where i wanted the straps to go to determine the approximate length of the velcro.

Tools:

Measuring tape or marked cutting mat

Scissors or rotary cutter

Sewing machine

Materials (per strap):

About 6 inches of both sides of velcro (that's 6 inches of "hook" and 6 inches of "loop"). 3/4-inch width.

About 16" x 3" fabric

Optional: 6" of bias tape

Thread to match (or contrast!)

Step 1: Cut Fabric to Size and Sew Into a Tube.

You'll need a piece of fabric about 16" (40 cm) by 3" (8 cm). I used part of an old flannel shirt.

It's always a good idea to iron. I didn't on this one because i was in a hurry.

Fold fabric in half lengthwise, with right-sides facing (the side of the fabric you ultimately want to be visible on your finished project is the "right" side. For this step, the "wrong" side will be on the outside).

Sew long edge and one short edge, with a 1/4" seam allowance. (Seam allowance=the distance from the edge of the fabric to your stitches).

Trim off the corner joining the long edge to the short edge that you sewed (see third photo). Be careful not to cut your stitches! This is to reduce excess fabric inside the strap once you invert it.

Step 2: Invert Tube.

Sorry, i have no pictures for this step. Use any method you like to turn the strap inside out. I used a drumstick. Basically, you fold the edges around the tube on the open side and put some sort of long, thin stick in the fold as you draw the tube over itself.

Step 3: Reinforce With Bias Tape.

Because i had some bias tape lying around, i decided to reinforce the part of the strap that will be attached to the lock. so, i sewed a strip of bias tape to the strap at one end. Remember how i said this was optional? Well, i only used it on the second strap and the other pictures in here are of the first strap, so the red bias tape will be missing from the future steps.

Step 4: Add First Strip of Velcro.

Starting with the end that will attach to the lock...

Fold the non-closed end of the inverted fabric tube over your lock so that end goes an extra centimeter or so beyond the lock edge. (There are varying widths of TiGr lock, so you want to use yours to make sure the loop fits well). Place the velcro on the strap, covering the end of the inverted fabric tube. I used the "loop" / soft piece of velcro for this end, but it doesn't really matter. Pin the velcro to the fabric, making sure to pin the part that covers the end. Now, sew the velcro to the fabric. I used a zig-zag stitch on the short ends and a straight stitch along the edges.

Step 5: Add Second Strip of Velcro.

Now you'll add the second strip of velcro on the opposite side of the fabric. I left just a few millimeters (maybe 1/4 inch) between the two lengthwise. In the first photo, you can see the first piece of velcro (with blue stitches) and the back side of the stitches that hold the second piece on (in red). The second photo is just to reinforce that the velcro pieces are on opposite sides of the strap.

Step 6: Repeat for Second Strap.

And that's it. You've got some hip new straps for your TiGr lock!

For me, the strap-making was easier than using the lock. I can't quite get the hang of how to lock the locking mechanism and then how to get it off once i have it unlocked. Any tips welcome in the comments!