Tackling shrinkage on leather sew-on bar wrap installs

An alert customer wrote to us after installing his sew-on bar wraps. After about a week or so of use, he noticed that the leather had shrunk back nearly 1/2″ from the indentation at the top of the bar. Here are his pictures: Image

Image

Although we have experienced some shrinkage before, usually it is forgivably slight, only 1/8″ or so, not 1/4″ or 1/2″, and usually there is not an indentation on the bar, so you never notice it later, like the bar wraps we installed in our video:
Image
 
We have sewn leather onto indented areas of a bar before, such as between lugs on a top tube, and it dried into place just fine without shrinking, but 1) the leather wasn’t getting torqued and pulled by your hands as part of normal use, and 2) we kept it lax and loose during installation.
 
The easiest answer, of course, to address such a shrinkage gap is to cover up the gap with a whip tie or electrical tape. If you have already installed your wraps and are looking to cover a shrinkage gap, we have two ideas for you:
  • You could wrap hemp/jute twine over the area (“whip tying“) – traditionally you would cover it with shellac but I find that watered-down Elmer’s glue dries clear and waterproofs and bonds the threads together.
  • Traditionally, electrical tape is used to secure bar tape, in this case you might want to choose colored electrical tape, to add some detail, such as a contrast pinstripe at the end or something, to cover the gap.
 
But what if you have indented bars and you really want it to stay where it’s sewed on?
 
Although there are tips and tricks we can offer to help minimize shrinkage at the top of your bar (bullets down below), if you’re hoping to install wraps precisely flush against an indentation, then our sew-on bar wraps will be a challenge. Leather is a natural product, that’s what makes it feel so good under your hands, but it does mean that it has very unique qualities. You have to get it wet to install it, which means that it is not in its final form when it’s getting installed.
 
These are our tips to minimize the shrinkage during installation:
  • Don’t pull the leather too tight during installation. The tighter you pull it down the bar, the more it will shrink. Be lax and loose.
  • Use the double-sided tape we include on the back of the wraps, and be sure to clean the bars with alcohol to remove any grease which would prevent the tape from sticking. If you are particularly worried about holding it in place and don’t mind it being difficult to remove later, you may consider using rubber cement adjacent to the step on your handlebars. Rubber cement will help hold it in place where it was stitched on.
  • Anchor it down at both ends with a whip tie or electrical tape.
 
Honey Coil Leather Wraps “whip-tyed” with artificial sinew by customer John B. in Mananita, Oregon.

About Walnut Studiolo

Walnut Studiolo crafts original modern designs by hand in our Oregon workshop using only natural materials. We are a family-run company located on the North Oregon Coast. Learn more about us on our website: https://walnutstudiolo.com

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