From Schwalbe:

“WARNING: Schwalbe Ultremo R tyres that exhibit bulging should be removed from use immediately. Free of charge replacements will be supplied.

 

Regrettably some ULTREMO R racing cycle tyres have been supplied into the market that may suffer failure during use due to a mistake in the manufacturing process, as the effected tyres’ carcass layer have not been sufficiently rubberised. In the few tyres concerned, after only a short time in use, the fault becomes clearly visible shown by a bulge due to the carcass layers becoming disconnected.

In no case should Ultremo R tyres that exhibit this phenomenon continue to be used. Replace the tyres immediately!”

 

Click ‘more’ for replacement information and more photos.

Schwable warns that the defective tires may lead to “catastrophic” failure. To get a replacement tires, just take a picture of the defect phenomenon and the product code found inside the tire. Then email them to ultremo@schwalbe.com.

 

The product code is inside the tire. Be sure to take a picture of it too when requesting a replacement.