Bridgestone X31 100/90-19 MX/Enduro Tyre Rear

The Bridgestone Battlecross X31 is a rear motocross tyre built for intermediate (medium) terrain — the loamy, mixed-surface tracks and trails that make up most riding days. This listing covers the 100/90-19 (57M) rear fitment, a common size for 19-inch motocross and enduro rear wheels.

Bridgestone's Castle Block design uses convex blocks shaped to roughly double the leading-edge contact area through the full range of lean angles, while Anti-Degradation Fins help the tyre shed heat and hold consistent performance as the moto goes on. Compared with the model it replaces, the X31 lifts traction, braking, cornering grip, bump absorption and block durability, and works across a broader spread of surfaces.

Not for use on public roads — off-road and competition use only.

• Rear motocross tyre developed for intermediate (medium) terrain
• Castle Block™ convex block design roughly doubles leading-edge contact area at all lean angles
• Anti-Degradation Fin™ helps cool the tyre and maintain consistent performance
• Improved traction, braking and cornering grip versus the previous generation
• Better bump absorption and block durability than its predecessor
• Broader operating range across varied surfaces
• 100/90-19 size with 57M load and speed rating
• Off-road and competition use only — not for public roads

Have fitting carried out by a qualified motorcycle tyre technician; check that the bead is seated evenly all the way around and that the rim lock is correctly tensioned.
Observe any rotation direction arrow marked on the sidewall when fitting the tyre to the wheel.
Scrub the tyre in gently for the first few laps — the mould release agent left on a new tyre reduces grip until it wears off.
Check and set pressures cold before every ride, using the pressure your motorcycle manufacturer recommends for the conditions and terrain.
After each ride, inspect for cuts, torn or chunked knobs, embedded stones and any carcass damage; replace the tyre if the casing is compromised.
Wash with mild soap and water only — avoid solvents, fuel and silicone-based tyre dressings, which can degrade the rubber and reduce grip.
Store mounted or unmounted tyres in a cool, dry, dark place away from direct sunlight, ozone sources such as electric motors, and chemical contact.
Retire the tyre once the knobs are significantly worn, rounded or torn, as traction and braking performance drop away well before the block bases disappear.
Use off-road and in competition only — this tyre is not intended for public roads.