Rene Herse TPU Tube Sealant

Enjoy the performance and convenience of TPU tubes with the flat-proofness of tubeless—truly the best of both worlds. Rene Herse sealant is specially formulated to seal small punctures in TPU tubes. Since the sealant is enclosed inside the TPU tube, it lasts a long time before it needs to be replenished. The sealant only needs to seal punctures—and not the entire tire/rim interface—so you need much less sealant than you would for tubeless. Use this formula:

Tire width (mm) = Sealant (ml)

Example: For 38 mm tires, use 38 ml of sealant.

Most riders add the sealant before they install the tube. Just remove the valve core and inject the sealant. The 100 ml bottle has a built-in valve core tool in the cap, and the nozzle fits onto the valve stem. You can inject the sealant directly out of the bottle into the tube. A clear strip with gradations on the side of the bottles make it easy to keep an eye on how much sealant you’ve injected.

The direct injection bottle isn’t just convenient for home shop use. You can also inject sealant on the road. That way, you can run your TPU tubes without sealant for the ultimate in speed. If you have a flat, remove the valve core, inject the sealant, replace the valve core, inflate—and you’re ready to go without having to remove the wheel, take off the tire, find the hole, etc.

Pro Tip: If you spot the debris (glass shard, steel wire) that caused your flat tire, remove it. That way, the debris won’t move around in the tire/tube as the tire rotates. If you can’t find it, that’s usually fine, too. (This applies to tubeless tires, too.)