Plush when you want it. Planted when you push.

G-Mousse Front Large is the go-to insert when the front carcass opens up — Fatty for soak-and-grip, or 90/90-21 when you want a slightly firmer front end without giving up flat protection.

Built for

MX · Rally · Extreme · Enduro on larger-section 21" fronts.

Pairing

• GOP3177N · GT216AA 90/90-21 — Est. 12–14 psi (firmer)
• GOP3176N · GT216AA Fatty 90/100-21 — Est. 10–12 psi (plush)
• GOP3181 · GT222 Chubby 90/90-21 · GOP3182 · GT222 Fatty 90/100-21

Catalog: 90/90-21 MX–Rally · 90/90-21 Extreme. Need Medium volume? MOU2000N Front Medium. Need XLarge firm rally? MOU2002N Front XLarge.

Specs

• Code: MOU2001N
• Size class: Front Large · 21"

• Construction: dual-heat polymer insert (replaces inner tube)
• Flat protection: 100%% competition flat-proof when correctly fitted
• Feel: fixed equivalent pressure (typical market range ~0.7–0.9 bar / ~10–13 psi; see pairings for estimates)
• Included: mousse lube
• Use: off-road / competition only — not road legal
• Fitment: designed for Goldentyre tyre carcasses (other brands may differ in section and wall thickness)
• Care: avoid prolonged asphalt and extreme heat (premature wear)
• Note: no warranty for improper use