AndreyT

I notice that original insoles in my Sidi shoes tend to gradually slide backwards during long rides. This creates an unpleasant and annoying "ridge" (front edge of the insole) under my toes in front of the shoe.

Under assumption that this is caused by the fact that my original insoles are getting old/shrinking/losing shape, I bought a new pair of Sidi insoles. The new ones fare much better (and I bought size 46 insoles for 45.5 shoes), but even the new ones have already began to exhibit the same behavior.

To alleviate this issue I used a relatively small amount of Shoe Goo to glue the insoles in place. It works, but Shoe Goo is more of a permanent adhesive. Meanwhile, I notice that Nike, Adidas and other brands use some kind of non-permanent adhesive in their running shoes. Their insoles are fairly easily removable, but still are prevented from sliding back and forth by the adhesive.

Does anyone know what kind of adhesive they are using? Is it available for sale? In spray form, perhaps?

coupster

A light coat of spray contact cement on one (1) surface only (probably the inner sole would be best) should give you the tack you need and the removability you want. Let it dry completely before you put it back in the shoe. Also once its dry you should be able to scrub it off, if it doesn't work.

indyfabz

Little pieces of Velcro?

AndreyT

If you mean both parts, then that would be way too thick. I.e. it would create a bump.

berner

A couple strips of double sided tape or a squirt of spray adhesive if you have some on hand.

AndreyT

Well, that's what my question is about. I have a couple of spray cans of 3M 77 adhesive. And I'm wondering if this adhesive is appropriate for this application. Continuous periodic changes in vertical loads, periodic shearing loads, elevated moisture levels, elevated temperatures etc. Will 3M 77 hold or will it just roll off into a bunch of tiny buggers? The adhesive in Nike and Adidas shoes definitely does not look like something generic, e.g. 3M 77.

Sy Reene

Sorry, but I'm not picturing what's going on.. where is the back/rear of the insole going if the front is moving backwards? I've never experienced this so do not understand how it could happen?

AndreyT

Good question... I wondered about that too. When I insert my original insoles into my shoes, they appear to be a good fit, i.e. they seem to have nowhere to go. But once I start riding, the insole starts sliding back gradually.

Edges of standard blue Sidi insoles are curled up around the heel area. I presume that as the insole slides backwards, the rear edge continues to curl up further and further. Also, it is likely that the heel area of the shoe becomes a bit more spacious as the shoe gets older.

I thought that swapping for a larger (46) insole will get rid of the issue, but after a few rides I noticed that I can already feel with my toes the front edge of the insole in my right shoe.

Once I glued down the insoles, the issue disappeared.

Sy Reene

I'd get a pair of the firmer but still thin, moldable insoles. They wouldn't be able to curl up as they are more solid (hence why they're heat moldable). I have these (in the "thin" variety) in most of my cycling shoes:

https://www.myfootshop.com/sole-active-insole

KraneXL

Then position it in the instep. BTW, a proper pair of good insole should not move (Aka, don't buy anymore Sidi insoles). The only time mine ever moved is when I bought size 46 insole for 48 shoe.

berner

I use the Sole heat moldable foot beds (insoles) everywhere also, ski boots, hiking boots and cycling shoes.

tagaproject6

I light coat of contact cement will fix that.

Moe Zhoost

double sided carpet tape is thin enough and grips very well.

terrymorse 

I would probably use some semi-permanent glue spots. They're thin, can be put anywhere you need them, have a high holding force, and are removable.

KraneXL

The point is to be able to replace your insole once they wear out. Gluing them doesn't make a lot of sense, unless you have raptor claws for toes? Only the cheapest manufactures glue their insoles.

ljsense

If you've got any tubular cement, that stuff works all kinds of wonders. It's designed to hold up to stress and release tires when they need to be replaced. You might have to scrape or acetone some residue off your shoe when you want to replace your insoles again, but it is a strong, non permanent glue that can bond well with a thin layer.