During a Zwift ride I noticed my Decathlon Van Rysel Trainer Tire developed these lumps. I removed everything, inflated the inner tube and no lumps. Inspected the interior of the tire and
Rollentrainer In'Ride 100 | VAN RYSEL | DECATHLON
Rollentrainer-Reifen 700 × 25 | VAN RYSEL | DECATHLON
Decathlon Van Rysel In'Ride 100 Home Trainer, Black - Walmart.com