Originally Posted by neduro
They do alright, but they build heat faster due to weight. So, you need a very tight fitting mousse, very well lubed, to have much durability.
The best mousse for the rear 908 on a 2.5 rim is a Michelin 140-80/90-18 DESERT mousse, which is different than the other 140s they have. It is the only mousse I've ever installed that I would describe as a true challenge without a mousse changer.
They can last for awhile on a big dual purpose-ish bike like a 990? Speed and weight have always seemed like the enemy of the mousse inserts.