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255/40R21 Tires

255/40R21 tires have a diameter of 29.0", a section width of 10.0", and a wheel diameter of 21". The circumference is 91.2" and they have 695 revolutions per mile.
Generally they are approved to be mounted on 8.5-10" wide wheels.
Specs may vary by manufacturer. learn more
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255/40R21 Tire Front
10.0"
29.0"
255/40R21 Tire Side
21 Inch Wheel
Circumference
91.2"
21"
4.0"
695 Revs/Mile
255/40R21
Diameter : 29.0"
Width : 10.0"
Wheel : 21" x 8.5-10"
Sidewall : 4.0"
Circum. : 91.2"
Revs/Mile : 695

Upsizing Wheels or Tires?

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Pirelli Tires
Pirelli Scorpion Winter 255/40R21
Scorpion Winter
Truck/SUV Winter | 102V XL
Avg. $292.00
 Performance 
Continental Tires
Continental ContiSportContact 5P 255/40R21
ContiSportContact 5P
Summer | 102Y XL
Avg. $301.50
 Supreme Performance 
$70 REBATE
Pirelli Tires
Pirelli P Zero PZ4 255/40R21
P Zero PZ4
Summer | 102Y XL
Avg. $311.00
 Supreme Performance 
$70 REBATE
Pirelli Tires
Pirelli P Zero PZ4 255/40R21
P Zero PZ4
Summer | 102V XL
Avg. $319.00
 Supreme Performance 
Continental Tires
Continental ContiSportContact 5 255/40R21
ContiSportContact 5
Summer | 102Y XL
Avg. $322.00
 Supreme Performance 
Continental Tires
Continental SportContact 6 255/40R21
SportContact 6
Summer | 102Y XL
Avg. $325.00
 Supreme Performance 
$70 REBATE
Pirelli Tires
Pirelli P Zero 255/40R21
P Zero
Summer | 102Y XL
Avg. $352.00
 Supreme Performance 
$70 REBATE
Pirelli Tires
Pirelli Scorpion Zero All Season Plus 255/40R21
Scorpion Zero All Season Plus
Truck/SUV All Season | 102V XL
Avg. $354.00
 Sport 
50K Miles
Michelin Tires
Michelin Pilot Sport 4S 255/40R21
Pilot Sport 4S
Summer | 102Y XL
Avg. $366.00
 Supreme Performance 
30K Miles
Michelin Tires
Michelin Pilot Sport 4 SUV 255/40R21
Pilot Sport 4 SUV
Truck/SUV Summer | 102Y XL
Avg. $387.00
 Sport 
20K Miles
Dunlop Tires
Dunlop SP Sport Maxx GT 255/40R21
SP Sport Maxx GT
Summer | 102Y XL
Avg. $423.00
 Supreme Performance 
Dunlop Tires
Dunlop Sport Maxx RT2 255/40R21
Sport Maxx RT2
Summer | 102Y XL
Avg. $503.00
 Supreme Performance