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305/30R21 Tires

305/30R21 tires have a diameter of 28.2", a section width of 12.0", and a wheel diameter of 21". The circumference is 88.6" and they have 715 revolutions per mile.
Generally they are approved to be mounted on 10.5-11.5" wide wheels.
Specs may vary by manufacturer. learn more
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305/30R21 Tire Front
12.0"
28.2"
305/30R21 Tire Side
21 Inch Wheel
Circumference
88.6"
21"
3.6"
715 Revs/Mile
305/30R21
Diameter : 28.2"
Width : 12.0"
Wheel : 21" x 10.5-11.5"
Sidewall : 3.6"
Circum. : 88.6"
Revs/Mile : 715

Upsizing Wheels or Tires?

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Continental Tires
Continental ProContact RX 305/30R21
ProContact RX
All Season | 104H XL
Avg. $451.00
 Grand Touring  
55K Miles
Pirelli Tires
Pirelli P Zero PZ4 305/30R21
P Zero PZ4
Summer | 100Y SL
Avg. $493.00
 Supreme Performance  
$50 REBATE
Goodyear Tires
Goodyear Eagle F1 Asymmetric 3 305/30R21
Eagle F1 Asymmetric 3
Summer | 104Y XL
Avg. $495.00
 Supreme Performance  
Pirelli Tires
Pirelli P Zero Nero GT 305/30R21
P Zero Nero GT
Summer | 104Y XL
Avg. $501.00
 Supreme Performance  
Pirelli Tires
Pirelli P Zero PZ4 305/30R21
P Zero PZ4
Summer | 104Y XL
Avg. $519.00
 Supreme Performance  
Michelin Tires
Michelin Pilot Sport Cup 2 Connect-240 305/30R21
Pilot Sport Cup 2 Connect-240
Summer | 104Y XL
Avg. $527.00
 Ultimate Performance  
Michelin Tires
Michelin Pilot Alpin 5 305/30R21
Pilot Alpin 5
Winter | 104V XL
Avg. $716.35
 Performance  
30K Miles