Additional 10mm travel spacers can be installed under Mastodon bottom-out bumpers to increase tyre (tire) clearance.  This also reduces travel.
10mm spacers allow 20mm larger OD tyres to be fitted.  20mm spacers allow +40mm OD.

Max OD for Mastodon STD = 758mm (29.8")
Max OD for Mastodon STD +10mm spacers = 778mm (30.6")
Max OD for Mastodon STD +20mm spacers = 798mm (31.4")  Same size as Mastodon EXT version, but 20mm less travel.

Mastodon Pro +10mm requires 1x 121-29113 for air shaft and 1x 121-32318 for damper shaft.
Mastodon Comp +10mm requires 1x 121-32318 for air shaft 1x 121-30396 for damper shaft.

121-29113 is used to adjust fork height and travel in 10mm steps on all models.