Simply put, this stuff gets the job done. GÜP is one of the easiest and most user-friendly ways to fix a flat. Here’s how it works:
Step 1: Get a flat tire (this is the hardest part).
Step 2: Unthread the Presta valve stem as if you were using a normal tire pump.
Step 3: Take out the can of GÜP, and remove the clear plastic cap. Put the yellow GÜP valve onto the valve stem of the wheel. With both hands, push down firmly. You’ll hear the GÜP flow into the tire as it inflates.
Step 4: Wait a few minutes, and then finish your ride.
One can has no problem getting a 29×2.5 tire up to about 30psi in a matter of seconds. Even 27.5+ tires inflate without issue. One can also has more than enough power to seat a tubeless tire, so long as you make sure the bead is in the right spot. Our testers have had more than a few rides saved thanks to these little blue cans. There was only one half-inch long sidewall tear that GÜP couldn’t fill, and even then, it held long enough to get me to the final climb.
It should come as no surprise that we love this stuff. GÜP is simple and works incredibly well. It’s better than the majority of trailside flat repair options on the market and takes up only a fraction of the space most kits do. Coupled with a tire patch kit or plug system, it’s enough to get you out of almost any flat situation without the use of a tube or a cumbersome hand pump.
Price: $14.99 per can