I wore my back-up shoes today and during the ride noticed that the sole is becoming separated from the body of the shoe at the heel end. The shoes are DMT Ultimax and the soles say "Fiber Glass and Carbon Concepts" on them. The two parts that need to be rejoined both look like black plastic. Anyone have experience with a similar repair? I wonder if the Continental rim glue I've got would work.

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3.7 oz Shoe Goo Adhesive Glue Leather Rubber BLACK

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Probably loctite will do better or something more in that range. Tubular glue wont stand a chance at all.

None of the above "recommendations" will work. Your best bet, if the shoes aren't too old, is a warranty claim as that separation is not a normal wear type of failure. Otherwise hot-melt glue may do the trick but if the plastic is polyethylene or similar, no type of glue will be effective.

Loctite makes a number of two part epoxies, including this plastic bonder. I have used it with considerable success.

This one might be a better choice. Works for polypro and polyethylene.

Thanks for the suggestions. I don't remember precisely, but I'd guess the shoes are around 10 years old, so I'm not holding the manufacturer responsible. I'll try to find some of the recommended products locally and report back with a success or failure story.

Buy new ones.

Good choice. When the previous poster recommended Loctite, I read it as one of the thread sealers, not their epoxy or other glues.

take it to a shoe repair guy

Household GOOP [https://www.biosafe-inc.com/ag_adhesives.htm].

All of my old second and third-tier hiking, walking, and cycling shoes are held together with this stuff. I even slop it on the lugs when they start to wear down.

Get it at Lowes/HomeDepot...keep it handy and in the same place you put your duct tape.

When the Laws of Physic are repealed, we'll hold the universe together with GOOP and duct tape.

I've used Barge Vinyl stick with nylon / leather combinations,
but Carbon composites are more likely epoxy laminates.

Yea probably a new pair of shoes, then you will have
an A/B choice of back-ups for the 3rd pair.

You are likely, pulling the upper from the sole as a mechanical result of clipless
pedals , and perhaps pulling on the backside of the down/power stroke..

Shenanigans. Nothing works for polyethylene.

But seriously, you've used it with HDPE with success? That might be interesting...

For the OP - epoxy from home depot should be fine. Epoxy binds plastics really, really well. Unless it's PE, then nothing works in my experience.

+1 Goop is holding my older hiking boot soles together as well as my wife's Tevas and my older son's soccer cleats (as well as dozens of things around the house, RV and anywhere else it is needed).

I vote for Shoe Goo, I've found it to be amazing stuff, smear in into small tire cracks to keep crud out.

Shoe Goo, etc. work well for gluing outsoles back onto midsoles and for building up worn soles. They are not strong enough to glue an upper to the sole as the bond area is too small.

It's working for me (entire front half of the sole seperated from the upper on both boots) and I put my hiking boots through some rough treatment.

For what you did it does work well as there is a lot of surface area for the bond. It's too weak for a thin-line repair.

My original post was perhaps misleading. The separation is between a solid sole and a solid sweeping piece of plastic or nylon that is like an inner sole and wraps up around the sides of the shoe and the heel to become the buckle straps. So there are two flat surfaces to be joined. This might give some idea of how they are made: https://www.racycles.com/product.aspx...61,361&pid=837

I've glued plastic and carbon pieces back together with that Loctite epoxy (the one in two attached tubes.) Worked great.

Both sets of my cycling shoes, MTB and Road, are presetly held together with Shoe Goo and have been for over a year and several thousand kilometers. There are lot's of good reasons to repair a comfortable pair of shoes: save money, better for the environment, don't have to spend time finding a replacement and then hoping they turn out to be comfortable and durable in the long run.

I had the same thing happen recently. Gorilla Glue has been holding so far.

+1 on the Gorilla Glue. Polyurethane is about the only thing I've found that works well on a leather to synthetic bond (or synthetic leather to rubberized plastic). Sticks to anything and stays flexible. Just clean the dirt off of the mating surfaces. Don't get it on your fingers, though, 'cause it won't come off until the top layer of your skin wears away...

Update: The entire nylon sole came free from my shoe today, except at the heel where I had applied Gorilla Glue. New shoes are on order, but I've glued the whole sole to the shoe using Gorilla Glue. Let's see how well this stuff can hold up.

...and my next cycling shoes will not be another pair of Adidas.

That's what I was thinking too. I use that stuff all the time now.