How much air should I put in my tires?

It is always recommended to use the pressures advised by your motorcycle manufacturer. These can be find in the motorcycle handbook and the tire specfication section.

Why do tires lose pressure in cold weather?

In cold weather, tire pressure drops because the air inside contracts, so it’s important to check and maintain proper pressure for safety and performance.

What do the numbers on tires mean?

The numbers on a motorcycle tire show key details like its size, fit, and performance ratings, including width, aspect ratio, rim size, load capacity, and speed rating.

Do motorcycle tires need to be balanced?

An unbalanced motorcycle tire can cause vibrations, uneven wear, and reduced stability, so proper balancing is important for a smoother, safer ride and longer tire life.

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Pirelli MT 21 Rallycross 120/80-18 Rear Tire - DOT Dual-Sport/Enduro | DOT-approved dual-sport tire. Tread for off-road & rally. High-performance grip. Fits adventure & dirt bikes. With Keychain.

Product ID: 742180345

Details

Brand
Pirelli
Load Capacity
584 pounds
Load Index
62
Rim Size
18 inches
Section Width
4.7 inches
Size
120/80-18

🌍Optimized tread for on/off-road mastery

🏍️120/80-18 size for versatile fit

🛡️Tear-resistant compound for durability

R14270

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Description

🏁 Grip the wild, own the road – Pirelli MT 21 Rallycross leads the pack!

DUAL SPORT DOMINANCE - Seamlessly conquer both rugged trails and smooth highways with confidence.
ENDURO GRADE DURABILITY - Reinforced blocks and puncture-resistant design ensure your tire outlasts the toughest terrains.
ICONIC PIRELLI PERFORMANCE - Trusted by pros, backed by a 10-ply construction and DOT approval for ultimate reliability.
PRECISION CONTROL AT SPEED - Flexible yet stable carcass delivers high-speed stability and razor-sharp handling.
YEAR ROUND ADVENTURE READY - Designed for all seasons, so your ride never has to pause.

The Pirelli MT 21 Rallycross 120/80-18 Rear Tire is a DOT-approved, dual-sport tire engineered for adventure riders seeking unmatched performance on both dirt and pavement. Featuring a tear-resistant compound, optimized asymmetrical tread, and a flexible yet stable 10-ply carcass, it delivers exceptional grip, durability, and high-speed stability year-round. Perfect for motocross, cross-country, and desert riding, this tire ensures you stay ahead in every terrain.

Specifications

ASIN	B0FD4BRRKM
Automotive Fit Type	Universal Fit
Best Sellers Rank	#736,012 in Automotive ( See Top 100 in Automotive ) #121 in Motocross Tires
Brand	Pirelli
Brand Name	Pirelli
Construction Type	Bias
Customer Reviews	5.0 out of 5 stars 14 Reviews
Included Components	(1) Pirelli MT 21 Rallycross 120/80-18 Rear Motorcycle Tire (1) Pirelli Keychain
Item Diameter	25.6 inches
Load Capacity	584 pounds
Load Index	62
Manufacturer	Pirelli
Manufacturer Part Number	P01-100 3988900
Manufacturer Warranty Description	https://www.pirelli.com/tires/en-us/motorcycle/tire-warranty
Model Number	P01-100 3988900
Number of Packs	1
Ply	10-Ply
Rim Size	18 inches
Seasons	Year Round
Section Width	4.7 inches
Size	120/80-18
Speed Rating	R
Tire Aspect Ratio	80
Tire Diameter	25.6 inches
Tread Depth	11 millimeters
Tread Type	Asymmetrical
UPC	810196671140
Unit Count	1 Count
Vehicle Tire ISO Metric Size Description	120/80-18

Reviews

E**D

Mounting

Excellent tires for the klx300. They are a bitch to mount the rimlock. I had to get the tires to almost 90psi to set the beadlock right otherwise they are nice.

12.08.2026

A**R

Happy with purchase

No problems, product as expected

9.07.2026

L**2

Top notch everything.

Arrived 1 day sooner than promised, top tier tires are excellent. Bought both front and rear and both tires have recent manufacture dates, a big deal as last time I ordered from Cycle Gear Chain and the rear was 3 years old.

27.03.2026

E**.

Excellent tire.

Excellent front tire, good price and good grip.

20.01.2026

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R14270

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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