Running bibs/foam inserts in moto?

Bibs is must for moto. Tube front, bib rear. Having the right mousse is critical. New 1.1bar is freaking useless to race on. Airmousse race ready is great, but dont expect more than 2-4 races out of them, then it gets rear-end low. Can get 5-10h more out of it if you dont care.

Worst with mousse-setup is it alters ride height quiet dramatically. Going from 2-3mm regular, worn, practice tire with a 15h mousse, to a new mousse, new rear tire really changes the balance of bike. We are talking maybe 3-5mm difference which is huge. You can compare it to altering fork height the same (not exactly same, but ride height effect is same).

I cant ride with tube in rear. Need like 1.0 bar minimum to avoid flats and that is just completely useless for traction, and the mousse gives a mouch better feel in my opinion when you get used to it.

Make sure to use the recommended mousse for a tire. Bridgestone tires a huge volume wise, Dunlop are tiny for example. To big mousse, freaking nightmare to install even with a Rabaconda.

A few years ago now Jett won Daytona and did a burnout until his mousse popped out of the tire. I don’t know what they are running on the front but mousse rears seem to be pretty common in mx at the pro level. I have heard mxgp riders use them a lot due to the tracks being rocky. 

MXGP i think everyone runs mousse both front and rear, maybe some US riders dont.
In AMA, mousse rear, tube front for MX. Tubes in both for SX.

I run a rear bib at most races. On the west coast we get some nasty square edge and rock and it definitely is a nice reassurance to know you can hit those square edges with out worrying about a flat. Also changes the characteristics of the suspensions (which I like) creating a dead feeling in the rear end.

I run tubliss in the rear, no more flats.

Ive never had it ruin my day, even when trail riding, I carry a plug kit and it takes usually 5 min to fix and Im on my way. But I usually change the inner tube often and retape my rim when I change tires. Not perfect as you stated but its been pretty damn good for me and never let me down over the 15 years Ive been running it (mainly trail riding). And for the track Ive never had it fail me since punctures are rare on the track, no flats!

I’ve never run anything other than a traditional tube setup in SoCal. Never had an issue. 

I’ve been racing with tubes in my tires for over 30 years.  I check my tire pressure before every moto and can’t recall ever having a flat tire at a race.  Used to get flats once in a while riding in the rocky hills in SoCal, but never on a track.

Is it difficult to install those compared to tubes? I’ve always ran tubes, but curious about trying them. 

Depends on mousse and tire combo. All the YouTube videos seems to have soft and large tires, and small mousses.

It's a brief if mousse has a little softer fitting, typically 0.7-0.8 air pressure. Otherwise, specially for first timers and even with a rababonda it can be tricky.

But again, depends on what mousse/tire combo you run.

Putting a low psi equivalent bib in a gummy tire is cakewalk with the right stand.

Putting a stiff bib in a 14" front tire for a 65 is the toughest thing Ive ever done.

There is the lazy man part to the story. One less thing to worry about, and if you are going on a trip, no one wants to be the guy changing a tube 100mi from civilization. If you are the kind of guy that 1 psi of feel is going to make or break your day, they are probably not for you (unless you get free bibs and a guy that changes them for you).

For the kid, Id rather just have a spare wheel set ready to go and deal with a popped tube later at home

The shop I worked for back in 2010 was in with Pirelli when the GP's came here so we got the chance to work the Pirelli deal in the pits. All the MXGP Pirelli guys ran mousse. I even got to bring a take off mousse and factory tire home with me. Never did run the mousse, but that tire was unreal!