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Motorcycle tire size

90/100-21 Motorcycle Tires

23 models in 90/100-21, from 8 brands we stock. Order online for delivery, or have them fitted at the shop in Orange.

What 90/100-21 means

90 is the section width in millimetres, measured across the tread. 100 is the aspect ratio: the sidewall is 100% of the section width, which works out to roughly 90 mm here. 21 is the rim diameter in inches — the wheel this tire mounts on.

On most motorcycles a 90/100-21 is a front tire.

The sizes listed for each model are the sizes it is made in. Confirm against the size on your own bike before ordering — wheel swaps change fitment.

Every 90/100-21 tire we stock

MICHELIN StarCross 6 Medium Soft — 90/100-21 motorcycle tire
MICHELIN
StarCross 6 Medium Soft

Michelin's most versatile off-road compound — built for mixed terrain, weekend warriors, and dual-sport riders who need grip that lasts.

Trail Rider / Weekend WarriorDual-Sport AdventurerCompetitive Enduro Racer
View tire →8.3
MICHELIN StarCross 6 Medium Soft

Michelin's most versatile off-road compound — built for mixed terrain, weekend warriors, and dual-sport riders who need grip that lasts.

Best suited for trail riders and dual-sport adventurers who cover varied ground and want proven grip without burning through tires every few rides.

Best for
Trail Rider / Weekend WarriorDual-Sport AdventurerCompetitive Enduro Racer
MICHELIN StarCross 6 Hard — 90/100-21 motorcycle tire
MICHELIN
StarCross 6 Hard

Purpose-built motocross rubber for hard-pack and packed clay — the go-to MX tire for racers and high-volume practice riders who live on firm terrain.

Hard-Pack RacerHigh-Volume Practice RiderSoft or Intermediate Terrain Rider
View tire →8.3
MICHELIN StarCross 6 Hard

Purpose-built motocross rubber for hard-pack and packed clay — the go-to MX tire for racers and high-volume practice riders who live on firm terrain.

The StarCross 6 Hard is built for competitive and practice riders who spend most of their time on firm, packed tracks where durability and grip retention matter most.

Best for
Hard-Pack RacerHigh-Volume Practice RiderSoft or Intermediate Terrain Rider
MICHELIN Enduro Medium 2 — 90/100-21 motorcycle tire
MICHELIN
Enduro Medium 2

Michelin's versatile intermediate enduro tire built for mixed terrain — hardpack to loam, soft mud to rocky technical trails — with grip that holds up as miles accumulate.

Trail Versatility RiderEnduro RacerConditions-Specific Specialist
View tire →8.2
MICHELIN Enduro Medium 2

Michelin's versatile intermediate enduro tire built for mixed terrain — hardpack to loam, soft mud to rocky technical trails — with grip that holds up as miles accumulate.

Best suited for enduro and trail riders who tackle mixed terrain regularly and want a single tire that performs reliably from installation to the end of its life

Best for
Trail Versatility RiderEnduro RacerConditions-Specific Specialist
MICHELIN StarCross 6 Medium Hard — 90/100-21 motorcycle tire
MICHELIN
StarCross 6 Medium Hard

Michelin's hard-pack motocross tire built for desert racers and MX riders who need durability and consistent grip when the ground gets firm.

Desert RacerWeekend MX EnthusiastSoft-Terrain Specialist
View tire →8.2
MICHELIN StarCross 6 Medium Hard

Michelin's hard-pack motocross tire built for desert racers and MX riders who need durability and consistent grip when the ground gets firm.

The StarCross 6 Medium Hard is built for desert and hardpack MX riders who want Michelin durability without sacrificing competitive grip lap after lap.

Best for
Desert RacerWeekend MX EnthusiastSoft-Terrain Specialist
PIRELLI Scorpion™ MX32™ Mid Hard — 90/100-21 motorcycle tire
PIRELLI
Scorpion™ MX32™ Mid Hard

Championship-bred motocross rubber built for mid-hard to hard-pack terrain — the race-proven choice for track warriors and hard-country trail riders.

Hard-Pack RacerDesert Trail RiderSoft Terrain Specialist
View tire →8.3
PIRELLI Scorpion™ MX32™ Mid Hard

Championship-bred motocross rubber built for mid-hard to hard-pack terrain — the race-proven choice for track warriors and hard-country trail riders.

Best suited to motocross racers and hard-country trail riders who need race-level grip and long-lasting durability on firm, rocky terrain.

Best for
Hard-Pack RacerDesert Trail RiderSoft Terrain Specialist
METZELER MCE 6 Days Extreme — 90/100-21 motorcycle tire
METZELER
MCE 6 Days Extreme

Factory-developed enduro rubber built for serious off-road competitors and backcountry adventure riders who refuse to compromise on traction or durability.

Enduro CompetitorAdventure PuristDual-Sport Commuter
View tire →8.3
METZELER MCE 6 Days Extreme

Factory-developed enduro rubber built for serious off-road competitors and backcountry adventure riders who refuse to compromise on traction or durability.

The MCE 6 Days Extreme is built for riders who spend the overwhelming majority of their time in the dirt — competitive enduro and hard off-road use is where it earns its reputation.

Best for
Enduro CompetitorAdventure PuristDual-Sport Commuter
PIRELLI Scorpion™ MX32 Mid Soft — 90/100-21 motorcycle tire
PIRELLI
Scorpion™ MX32 Mid Soft

A competition-bred motocross tire built for medium-to-soft terrain transitions — from club racers to youth riders learning their first laps.

The Club RacerThe Weekend WarriorThe Soft-Terrain Specialist
View tire →8.2
PIRELLI Scorpion™ MX32 Mid Soft

A competition-bred motocross tire built for medium-to-soft terrain transitions — from club racers to youth riders learning their first laps.

Best suited for motocross riders who tackle mixed or soft-transitioning track conditions and want competitive grip with better-than-average wear life.

Best for
The Club RacerThe Weekend WarriorThe Soft-Terrain Specialist
DUNLOP Geomax AT82 — 90/100-21 motorcycle tire
DUNLOP
Geomax AT82

Dunlop's hardworking dual-sport tire built for riders who clock real miles on both pavement and dirt without babying their rubber.

Adventure CommuterBudget-Conscious ExplorerAggressive Off-Road Rider
View tire →7.8
DUNLOP Geomax AT82

Dunlop's hardworking dual-sport tire built for riders who clock real miles on both pavement and dirt without babying their rubber.

Best suited for adventure and dual-sport riders who split time evenly between paved roads and unpaved terrain and want a tire that earns its keep over the long haul.

Best for
Adventure CommuterBudget-Conscious ExplorerAggressive Off-Road Rider
MAXXIS Maxxcross SI — 90/100-21 motorcycle tire
MAXXIS
Maxxcross SI

A competition-bred motocross tire built for soft-to-intermediate dirt — loam, sand, and berms are where this thing lives.

Motocross CompetitorOff-Road Trail EnthusiastDual-Sport Street Rider
View tire →8.2
MAXXIS Maxxcross SI

A competition-bred motocross tire built for soft-to-intermediate dirt — loam, sand, and berms are where this thing lives.

Best suited for motocross competitors and weekend off-road riders who spend their time in dirt — not pavement

Best for
Motocross CompetitorOff-Road Trail EnthusiastDual-Sport Street Rider
MAXXIS Maxxcross IT — 90/100-21 motorcycle tire
MAXXIS
Maxxcross IT

A durable, race-proven intermediate-to-hardpack motocross tire built for riders who want consistent grip and long-lasting performance across multiple sessions.

The Developing RacerThe Practice RegularThe Soft-Terrain Specialist
View tire →8.2
MAXXIS Maxxcross IT

A durable, race-proven intermediate-to-hardpack motocross tire built for riders who want consistent grip and long-lasting performance across multiple sessions.

Best suited for amateur and developing motocross riders who log serious track time and need a durable, predictable tire that performs across intermediate to hardpack conditions.

Best for
The Developing RacerThe Practice RegularThe Soft-Terrain Specialist
MITAS Enduro Trail-XT+ Dakar — 90/100-21 motorcycle tire
MITAS
Enduro Trail-XT+ Dakar

An 80/20 off-road-first adventure tire built for riders who treat pavement as the route to the real ride — not the destination.

Backcountry ExplorerDual-Sport WeekenderStreet-Focused Adventure Rider
View tire →8.2
MITAS Enduro Trail-XT+ Dakar

An 80/20 off-road-first adventure tire built for riders who treat pavement as the route to the real ride — not the destination.

The XT+ Dakar is built for adventure riders who spend the majority of their miles off pavement and need a tire that can handle the abuse

Best for
Backcountry ExplorerDual-Sport WeekenderStreet-Focused Adventure Rider
MITAS Terra Force-EF Super Light — 90/100-21 motorcycle tire
MITAS
Terra Force-EF Super Light

FIM-spec enduro race rubber built for technical, wet, and hard-packed terrain — not your weekend dual-sport commuter tire.

Enduro RacerSerious Off-Road EnthusiastDual-Sport Commuter
View tire →8.2
MITAS Terra Force-EF Super Light

FIM-spec enduro race rubber built for technical, wet, and hard-packed terrain — not your weekend dual-sport commuter tire.

Built for enduro racers and serious off-road riders who put grip and compliance ahead of mileage — this is purpose-built race rubber, full stop.

Best for
Enduro RacerSerious Off-Road EnthusiastDual-Sport Commuter
MITAS Terra Force-MX MH — 90/100-21 motorcycle tire
MITAS
Terra Force-MX MH

Purpose-built MX hardpack tire forged in US supercross testing — built for racers and serious weekend riders who live on medium-to-hard terrain.

Hardpack RacerWeekend WarriorSoft Terrain Specialist
View tire →8.1
MITAS Terra Force-MX MH

Purpose-built MX hardpack tire forged in US supercross testing — built for racers and serious weekend riders who live on medium-to-hard terrain.

The Terra Force-MX MH is built for competitive and recreational MX riders who put in serious motos on medium-to-hard terrain and need a tire that lasts.

Best for
Hardpack RacerWeekend WarriorSoft Terrain Specialist
MITAS Enduro Trail-XT+ — 90/100-21 motorcycle tire
MITAS
Enduro Trail-XT+

An 80/20 off-road-first adventure tire built for trail riders who treat pavement as the exception, not the rule.

Off-Road ExplorerDual-Sport WeekenderStreet-Biased ADV Rider
View tire →8.1
MITAS Enduro Trail-XT+

An 80/20 off-road-first adventure tire built for trail riders who treat pavement as the exception, not the rule.

Best suited for adventure and dual-sport riders who live on trails and dirt roads, with occasional highway miles to connect the dots.

Best for
Off-Road ExplorerDual-Sport WeekenderStreet-Biased ADV Rider
AMS Bite MX — 90/100-21 motorcycle tire
AMS
Bite MX

A workhorse motocross tire built for intermediate to hardpack terrain — consistent, durable, and priced right for club racers and serious practice riders.

Club Racer ChrisWeekend Warrior DanaPro-Level Competitor
View tire →7.8
AMS Bite MX

A workhorse motocross tire built for intermediate to hardpack terrain — consistent, durable, and priced right for club racers and serious practice riders.

Best suited for club racers and practice-day regulars who need dependable grip on intermediate to hardpack terrain without constantly swapping tires.

Best for
Club Racer ChrisWeekend Warrior DanaPro-Level Competitor
KENDA K775 Washougal II — 90/100-21 motorcycle tire
KENDA
K775 Washougal II

A hard-working intermediate motocross tire built for riders who live between the track and the trail — tough, versatile, and priced to ride.

Weekend WarriorIntermediate RacerSoft-Terrain Specialist
View tire →7.8
KENDA K775 Washougal II

A hard-working intermediate motocross tire built for riders who live between the track and the trail — tough, versatile, and priced to ride.

The K775 Washougal II is the go-to choice for motocross and trail riders who need a durable, do-it-all tire that performs consistently on mixed terrain without breaking the bank.

Best for
Weekend WarriorIntermediate RacerSoft-Terrain Specialist
KENDA Washougal III — 90/100-21 motorcycle tire
KENDA
Washougal III

A hard-pack and intermediate-terrain motocross tire built for riders who want FIM-legal race performance without the factory-team price tag.

Regional RacerHard-Pack PractitionerSoft-Terrain Specialist
View tire →7.8
KENDA Washougal III

A hard-pack and intermediate-terrain motocross tire built for riders who want FIM-legal race performance without the factory-team price tag.

The Washougal III is the go-to choice for club racers and serious trail riders who spend most of their time on intermediate-to-hard terrain and need race-legal durability at a competitive price.

Best for
Regional RacerHard-Pack PractitionerSoft-Terrain Specialist
MAXXIS Maxxcross Desert IT — 90/100-21 motorcycle tire
MAXXIS
Maxxcross Desert IT

Purpose-built desert racing rubber for riders who need one tire to handle sand, hardpack, and rocks without flinching — miles from nowhere.

Desert RacerAdventure ExplorerMX Track Specialist
View tire →7.8
MAXXIS Maxxcross Desert IT

Purpose-built desert racing rubber for riders who need one tire to handle sand, hardpack, and rocks without flinching — miles from nowhere.

The Desert IT is the go-to choice for desert racers and remote backcountry riders who need a tire tough enough to finish — not just start.

Best for
Desert RacerAdventure ExplorerMX Track Specialist
MITAS Terra Force-EF Super — 90/100-21 motorcycle tire
MITAS
Terra Force-EF Super

FIM-legal enduro rubber built for hard-pack aggression and dual-sport durability — the go-to for competition-minded riders who occasionally see pavement.

Enduro RacerAdventure Dual-Sport RiderSoft-Terrain Specialist
View tire →7.8
MITAS Terra Force-EF Super

FIM-legal enduro rubber built for hard-pack aggression and dual-sport durability — the go-to for competition-minded riders who occasionally see pavement.

Best suited for enduro competitors and adventure riders who spend the vast majority of their time off-pavement on hard, rocky, or rooty terrain.

Best for
Enduro RacerAdventure Dual-Sport RiderSoft-Terrain Specialist
MITAS Terra Force-EF 2 SM Super Light — 90/100-21 motorcycle tire
MITAS
Terra Force-EF 2 SM Super Light

FIM-derived enduro rubber with a soft compound and super-light carcass — built for riders who spend 80% of their time in the dirt and need DOT legality for the rest.

Trail-Focused Dual-Sport RiderWeekend Enduro RacerAdventure Tourer or Pavement-Heavy Commuter
View tire →7.8
MITAS Terra Force-EF 2 SM Super Light

FIM-derived enduro rubber with a soft compound and super-light carcass — built for riders who spend 80% of their time in the dirt and need DOT legality for the rest.

Best suited for plated enduro and dual-sport riders who live in the dirt and only hit pavement to connect trail sections.

Best for
Trail-Focused Dual-Sport RiderWeekend Enduro RacerAdventure Tourer or Pavement-Heavy Commuter
MITAS Terra Force-EX MH Super Light — 90/100-21 motorcycle tire
MITAS
Terra Force-EX MH Super Light

A competition-bred, DOT-legal dual sport tire built for medium to hard-pack dirt — with just enough street compliance to get you to the trailhead and back.

Trail-Focused Dual Sport RiderWeekend Enduro EnthusiastAdventure Touring Rider
View tire →7.8
MITAS Terra Force-EX MH Super Light

A competition-bred, DOT-legal dual sport tire built for medium to hard-pack dirt — with just enough street compliance to get you to the trailhead and back.

Best suited for enduro and trail riders on medium to hard-pack terrain who need DOT compliance for occasional pavement connections — not a commuter or highway tire

Best for
Trail-Focused Dual Sport RiderWeekend Enduro EnthusiastAdventure Touring Rider
MITAS Terra Force-EF 2 SM Super — 90/100-21 motorcycle tire
MITAS
Terra Force-EF 2 SM Super

FIM-spec enduro front tire built for hare scrambles, desert racing, and hard backcountry riding where soft-to-intermediate terrain demands real bite.

Enduro RacerBackcountry Dual-Sport RiderMostly-Pavement Dual-Sport Rider
View tire →7.8
MITAS Terra Force-EF 2 SM Super

FIM-spec enduro front tire built for hare scrambles, desert racing, and hard backcountry riding where soft-to-intermediate terrain demands real bite.

The Terra Force-EF 2 SM Super is the right call for enduro racers and backcountry riders spending at least 80% of their time on dirt — street manners are strictly secondary.

Best for
Enduro RacerBackcountry Dual-Sport RiderMostly-Pavement Dual-Sport Rider
MITAS Terra Force-EX MH Super — 90/100-21 motorcycle tire
MITAS
Terra Force-EX MH Super

Mitas' hardpack-focused competition enduro tire — built for desert racers and dual sport explorers who live 80% in the dirt.

Desert RacerDual Sport ExplorerTechnical Woods Rider
View tire →7.8
MITAS Terra Force-EX MH Super

Mitas' hardpack-focused competition enduro tire — built for desert racers and dual sport explorers who live 80% in the dirt.

Best suited for enduro racers and serious dual sport riders who spend most of their miles on hardpack, desert, and rocky trails.

Best for
Desert RacerDual Sport ExplorerTechnical Woods Rider

Brands that make a 90/100-21

Other common sizes

Running a different size front and rear? These are the other sizes we stock, closest wheel diameter first.

Before you buy

Fitting a 90/100-21 at MTC

We mount and balance every tire we sell, and tires you bring in. Walk-ins welcome at the Orange shop, or book a slot so the bay is ready when you arrive.