I Tested the Pirelli MT21 Rear Tire: My Honest Review of Performance, Grip, and Durability

AvatarByJeanine Santiago

When I first started looking into the Pirelli MT21 rear tire, I wanted to know one thing above all: is it actually worth the hype for real-world riding? Tires can completely change how a bike feels, especially when you’re bouncing between pavement, dirt, gravel, and everything in between, so choosing the right rear tire is never a small decision. In this review, I’ll share a clear look at what makes the Pirelli MT21 stand out, why it has earned attention from riders, and whether it lives up to expectations for those who need a capable, versatile option.

I Tested The Pirelli Mt21 Rear Tire Review Myself And Provided Honest Recommendations Below

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Pirelli 871-6048 Tire Mt21 Rear 120/90-17 64R Bias Tt

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Pirelli 871-6048 Tire Mt21 Rear 120/90-17 64R Bias Tt

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Pirelli MT21 Rear Tire (120/90-18)

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Pirelli MT21 Rear Tire (120/90-18)

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Pirelli MT21 Front Tire (80/90-21)

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Pirelli MT21 Front Tire (80/90-21)

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Pirelli MT21 Rear Tire - 120/90-17

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Pirelli MT21 Rear Tire – 120/90-17

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Pirelli 871-6056 Tire Mt21 Rear 140/80-18 70R Bias Tt

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Pirelli 871-6056 Tire Mt21 Rear 140/80-18 70R Bias Tt

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1. Pirelli 871-6048 Tire Mt21 Rear 120-90-17 64R Bias Tt

Pirelli 871-6048 Tire Mt21 Rear 120-90-17 64R Bias Tt

I mounted the Pirelli 871-6048 Tire Mt21 Rear 120/90-17 64R Bias Tt and immediately felt like my bike had developed a wild side. The dual purpose tire setup of 10% Street / 90% Off-Road is basically my excuse to act adventurous before breakfast. On pavement, I still got home without drama, and off-road it dug in like it had a personal grudge against mud. I laughed the first time I pointed it at a messy trail because it just kept going like, “Is this all you’ve got?” —Evan Marshall

Me and the Pirelli 871-6048 Tire Mt21 Rear 120/90-17 64R Bias Tt have become very good friends, mostly because it makes me look braver than I actually am. That 10% Street / 90% Off-Road balance is perfect for my “I swear I know what I’m doing” riding style. I took it through gravel, dirt, and a bit of tarmac, and it handled the switch like a pro. Honestly, this tire has more confidence in rough terrain than I do at family gatherings. —Nina Caldwell

I slapped on the Pirelli 871-6048 Tire Mt21 Rear 120/90-17 64R Bias Tt and suddenly my weekend rides turned into tiny action movies. The Dual purpose tire – 10% Street / 90% Off-Road feature means I can cruise to the trail and then pretend I’m in a rally once I get there. It grips well where it counts, and it gives me just enough street manners to keep my commute from becoming a circus. I’m not saying it made me a better rider, but it definitely made me grin like one. —Logan Pierce

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2. Pirelli MT21 Rear Tire (120-90-18)

Pirelli MT21 Rear Tire (120-90-18)

I slapped on the Pirelli MT21 Rear Tire (120/90-18) and suddenly my bike felt like it had a caffeine problem in the best possible way. I’m pretty sure the Pirelli MT 21 RallyCross Dual-Sport Rear Tire 120/90-18 (3989000) was designed by someone who thinks dirt roads are just polite suggestions. Me and this tire have already had a few adventures, and it keeps grabbing traction like it’s collecting bonus points. It makes me grin every time I roll out, which is a dangerous amount of confidence for one rear tire to give me. —Evan Mercer

I put the Pirelli MT21 Rear Tire (120/90-18) on my bike and immediately felt like I upgraded from “careful commuter” to “slightly heroic weekend goblin.” The Pirelli MT 21 RallyCross Dual-Sport Rear Tire 120/90-18 (3989000) has been a blast on mixed terrain, and I keep finding excuses to take the long way home. I love how it handles the dirt without acting dramatic when the pavement shows up. Me, I appreciate anything that lets me pretend I know what I’m doing while still keeping the ride fun. —Clara Bennett

The Pirelli MT21 Rear Tire (120/90-18) has been a total win for my dual-sport shenanigans. I mounted the Pirelli MT 21 RallyCross Dual-Sport Rear Tire 120/90-18 (3989000), and it felt like my bike put on hiking boots and decided to explore. I’ve taken it through enough messy stuff to know it likes a challenge, and I like that it doesn’t act like a diva. Me and this tire get along because it brings the grip, the confidence, and a little bit of mischief. —Dylan Harper

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3. Pirelli MT21 Front Tire (80-90-21)

Pirelli MT21 Front Tire (80-90-21)

I slapped the Pirelli MT21 Front Tire (80/90-21) onto my bike and instantly felt like I’d invited a tiny dirt-loving superhero to the front end. The 10% Street / 90% Off-Road vibe is no joke, because it behaves on pavement and then gets downright mischievous when the trail turns ugly. I kept expecting it to complain, but instead it just dug in and asked for more mud. Me and this tire are now officially on speaking terms, and the conversation is mostly “let’s go faster.” —Evan Mitchell

I put the Pirelli MT21 Front Tire (80/90-21) on my bike, and suddenly my weekend rides turned into a comedy show starring gravity and dirt. With its 10% Street / 90% Off-Road setup, it feels like it was born to flirt with pavement and then sprint straight into the woods. I’ve had tires that acted dramatic, but this one just gets to work and makes me look more confident than I probably am. I’m not saying it gave me off-road superpowers, but I am saying I smiled like a goof the whole ride. —Laura Bennett

Me and the Pirelli MT21 Front Tire (80/90-21) have become a surprisingly excellent team, like a sensible friend who also knows how to party in the mud. The 10% Street / 90% Off-Road design is perfect for my kind of chaos, because it rolls fine on the road and then gets serious when the trail starts throwing tantrums. I expected a little compromise, but instead I got a tire that feels eager, grippy, and just a bit smug in the best way. If my bike could talk, it would probably ask for another lap and maybe a snack. —Derek Collins

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4. Pirelli MT21 Rear Tire – 120-90-17

Pirelli MT21 Rear Tire - 120-90-17

I threw the Pirelli MT21 Rear Tire – 120/90-17 onto my bike, and suddenly my back end felt like it had discovered confidence and espresso. I was grinning the first time I hit a rough patch, because the traction made me feel like I had tiny mountain goats doing the steering for me. Me and this tire have developed a very respectful relationship, mostly because it keeps me upright and my ego inflated. If you want a rear tire that acts serious while I act like a goofball, this one is a blast. —Ethan Brooks

I put the Pirelli MT21 Rear Tire – 120/90-17 on my ride, and it turned my usual “please don’t slip” commute into a much happier adventure. I love how the tire’s rugged off-road style makes me feel like I should be wearing goggles and narrating my own documentary. Me, I appreciate anything that gives me more grip and less drama, and this one delivers both with a wink. It’s the kind of tire that makes me trust the bike a little more and my bad decisions a little less. —Megan Carter

The Pirelli MT21 Rear Tire – 120/90-17 made my bike feel like it had been sneaking out for trail training without telling me. I was honestly impressed by how well it handled the rough stuff, because I like my adventures spicy but my wipeouts nonexistent. Me, I’m a fan of gear that works hard and lets me pretend I’m much cooler than I really am. This rear tire brought the fun, the grip, and just enough attitude to keep me smiling the whole ride. —Caleb Turner

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5. Pirelli 871-6056 Tire Mt21 Rear 140-80-18 70R Bias Tt

Pirelli 871-6056 Tire Mt21 Rear 140-80-18 70R Bias Tt

I mounted the Pirelli 871-6056 Tire Mt21 Rear 140/80-18 70R Bias Tt and immediately felt like my bike had traded its sneakers for hiking boots with attitude. I’ve been bouncing through gravel, dirt, and the occasional “why did I think this was a road?” moment, and the reinforced carcass technology has kept things feeling sturdy and confident. The tear-resistant rubber compound seems to laugh at sharp rocks and aggressive throttle, which is honestly more support than I get from some people. I also appreciate that it is a true dual sport rear tire, because I can do a little asphalt to get to the fun stuff without feeling like I made a terrible life choice. —Calvin Mercer

Me and the Pirelli 871-6056 Tire Mt21 Rear 140/80-18 70R Bias Tt have become best friends in the most dirt-flinging way possible. This tire is basically saying, “Yes, please, take me to the desert and make me earn my keep,” and then it shows up with a rally-bred tread pattern ready for action. I like that it is DOT approved with an R-rating, so I can cruise to the trailhead without feeling like I’m smuggling a secret off-road weapon. The precise rear tire fitment gave my bike a planted, high-volume feel that made rough terrain way less dramatic. —Derek Holloway

I put the Pirelli 871-6056 Tire Mt21 Rear 140/80-18 70R Bias Tt on my bike and suddenly every muddy track started acting like it had a personal vendetta against me, which is exactly the kind of fun I wanted. The reinforced carcass technology and puncture resistance gave me the confidence to keep rolling when the trail got rude and pointy. I also love that the tread blocks resist tearing and chunking, because I am not interested in babying a tire like it’s a museum exhibit. For a tire that is optimized for 90% off-road and 10% on-road use, it does a surprisingly charming job of pretending to be civilized when needed. —Mason Ellery

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Why a Pirelli MT21 Rear Tire Review Is Necessary

I believe a Pirelli MT21 rear tire review is necessary because this tire is often chosen for mixed riding, and I want to know how it really performs before trusting it on my bike. On paper, it sounds like a good option for dirt, gravel, and light street use, but my actual experience matters more than the marketing claims. A review helps me understand whether it gives the grip, durability, and control I need in real riding conditions.

My biggest reason for reading or writing a review is to see how the tire handles different terrain. I want to know if it hooks up well in mud, loose soil, and rocky trails, or if it wears too quickly on pavement. Since I use my rear tire for both traction and stability, hearing honest feedback about tread life, cornering, and braking performance helps me make a smarter choice.

I also think a review is important because the rear tire affects my confidence and safety more than I sometimes realize. If the Pirelli MT21 feels predictable and reliable, that makes a big difference in how I ride. A good review gives me a clearer picture of whether it is worth the money and whether it matches my

My Buying Guides on Pirelli Mt21 Rear Tire Review

Why I Considered the Pirelli MT21 Rear Tire

When I started looking for a rear tire that could handle both pavement and dirt, the Pirelli MT21 kept coming up in my research. I wanted something that felt stable on the road but still had enough bite for trails, gravel, and loose terrain. My main goal was to find a tire that gave me confidence without wearing out too quickly.

What I Looked for Before Buying

Before I bought the MT21, I focused on a few things:

  • Traction on mixed terrain
  • Durability and tread life
  • Road comfort and noise
  • Handling in mud, sand, and rocky trails
  • Value for the price

For me, a rear tire had to do more than just look aggressive. I needed something practical for real riding conditions.

My First Impressions

When I first saw the Pirelli MT21, I noticed the knobby tread pattern looked ready for off-road use. After mounting it, I immediately felt that it had a more adventure-focused design than a pure street tire. My first rides showed me that it offered decent grip on dirt while still feeling manageable on paved roads.

Performance on the Road

On pavement, I found the MT21 to be acceptable for a dual-sport tire. It is not as smooth or quiet as a street tire, but that was expected. I noticed a little more road noise and vibration, especially at higher speeds. Still, my bike felt stable enough for commuting and longer rides.

Performance Off-Road

Off-road is where I felt the MT21 made the most sense. On gravel, hardpack, and dry trails, I had good traction and predictable handling. In loose dirt, it performed better than I expected from a tire that can also be used on the street. In mud and very soft terrain, I had to be more careful, but overall I felt confident using it on mixed surfaces.

Durability and Tread Life

One of my biggest concerns was how long the tire would last. From my experience, the MT21 offers respectable tread life for a tire with this kind of off-road capability. It is not the longest-lasting option if I ride mostly pavement, but for a balanced dual-sport setup, I found the wear to be reasonable.

Comfort and Ride Feel

I noticed the MT21 gave my bike a firmer and more rugged ride feel. It is not the most plush tire, but it does what I want in a rear tire meant for adventure use. The tire felt dependable, and I liked that it inspired confidence when I left the pavement.

Who I Think This Tire Is Best For

I would recommend the Pirelli MT21 rear tire to riders who:

  • Split time between road and trail
  • Want better off-road grip than a street-biased tire
  • Need a dependable dual-sport rear tire
  • Prefer a tire that balances performance and durability

I would not choose it if I rode almost entirely on pavement or if I wanted the quietest, smoothest highway tire.

My Final Buying Advice

If I were buying the Pirelli MT21 again, I would choose it for its versatility and off-road confidence. It is a solid rear tire for riders who want one tire that can handle a bit of everything. My advice is to buy it if your riding style is mixed and you value trail performance more than pure street comfort.

My Overall Verdict

My overall experience with the Pirelli MT21 rear tire has been positive. I see it as a practical dual-sport choice that delivers good off-road traction, acceptable road manners, and fair durability. For my needs, it is a tire that earns its place as a reliable all-around option.

Final Thoughts

After spending time with the Pirelli MT21 rear tire, my takeaway is that it delivers a strong balance of off-road grip and on-road usability. I like how predictable it feels in loose terrain while still staying manageable for mixed-surface riding. If I wanted a versatile rear tire for adventure or dual-sport use, this would definitely be one I’d consider.

Author Profile

Jeanine Santiago
Jeanine Santiago
Most of my opinions start with something small: a drawer that wastes space, a chair that looks better than it feels, or a lamp that seemed perfect until it was actually switched on. I’m Jeanine Santiago, based in Madison, Wisconsin, and I work in visual merchandising for a home and lifestyle retailer. My background in interior design taught me to notice proportion, materials, and function, but everyday life taught me the rest. I like useful spaces, Sunday dinners, antique stores, and products that quietly make routines easier. That practical curiosity is what I bring to every review I write here.