chipworkz
11-09-2008, 02:53 PM
I just installed the Kenda Knarly XC 21-11-9 rear and Kenda Parker DT 22-7-10 front tires and here is some info for all of you looking to change your tires.
Original tires
Dunlop K391 front 21-7-10, 15.2 lbs with stock rims. (4 Ply Tire)
Dunlop K396 rear 20-10-9, 18.8 lbs with stock rims. (4 Ply Tire)
New tires
Kenda Parker DT front 22-7-10, 15.8 lbs with stock rims. (6 Ply Tire)
Kenda Knarly XC rear 21-11-9, 22.0 lbs with stock rims. (6 Ply Tire)
All tires set at 6 psi for measurements.
The measured circumference and diameter of the tires are as follows
Dunlop front C=66 inches D=21.01
Dunlop rear C=63.5 inches D=20.21
Kenda front C=69.5 inches D=22.12
Kenda rear C=65.5 inches D=21.01
The new larger tires raised the front of the quad approximately 1/2 inch.
The rear was raised by approximately 3/8 of an inch.
The new larger rear tires also is equal to lowering the rear sprocket by 1.5 teeth. My 15/38 sprockets are now equal to a 15/37 to 15/36 combo.
Old tire diameter divided by new tire diameter multiplied by current gear ratio = new gear ratio. 20.21 / 21.01 X 2.53 = 2.43
See chart. (http://www.renthal.com/File/gearing_ratios.asp)
The extra height and taller gearing is exactly what I was looking for since I ride mostly in rocky desert terrain. I will update this with a ride report after my Thanksgiving trip.
Hope this helps someone.
Quad with Dunlop tires
http://www.offroadtoybox.com/tire/Old%20Angle.jpghttp://www.offroadtoybox.com/tire/Old%20Side.jpg
Quad with Kenda tires
http://www.offroadtoybox.com/tire/New%20Angle.jpghttp://www.offroadtoybox.com/tire/New%20Side.jpg
Front side by side
http://www.offroadtoybox.com/tire/Front%20Comp.jpg
http://www.offroadtoybox.com/tire/Front%20Closeup.jpg
http://www.offroadtoybox.com/tire/Front%20Side%20Comp.jpg
Rear side by side
http://www.offroadtoybox.com/tire/Rear%20Comp.jpg
http://www.offroadtoybox.com/tire/Rear%20closeup.jpg
http://www.offroadtoybox.com/tire/Rear%20Side%20Comp.jpg
Original tires
Dunlop K391 front 21-7-10, 15.2 lbs with stock rims. (4 Ply Tire)
Dunlop K396 rear 20-10-9, 18.8 lbs with stock rims. (4 Ply Tire)
New tires
Kenda Parker DT front 22-7-10, 15.8 lbs with stock rims. (6 Ply Tire)
Kenda Knarly XC rear 21-11-9, 22.0 lbs with stock rims. (6 Ply Tire)
All tires set at 6 psi for measurements.
The measured circumference and diameter of the tires are as follows
Dunlop front C=66 inches D=21.01
Dunlop rear C=63.5 inches D=20.21
Kenda front C=69.5 inches D=22.12
Kenda rear C=65.5 inches D=21.01
The new larger tires raised the front of the quad approximately 1/2 inch.
The rear was raised by approximately 3/8 of an inch.
The new larger rear tires also is equal to lowering the rear sprocket by 1.5 teeth. My 15/38 sprockets are now equal to a 15/37 to 15/36 combo.
Old tire diameter divided by new tire diameter multiplied by current gear ratio = new gear ratio. 20.21 / 21.01 X 2.53 = 2.43
See chart. (http://www.renthal.com/File/gearing_ratios.asp)
The extra height and taller gearing is exactly what I was looking for since I ride mostly in rocky desert terrain. I will update this with a ride report after my Thanksgiving trip.
Hope this helps someone.
Quad with Dunlop tires
http://www.offroadtoybox.com/tire/Old%20Angle.jpghttp://www.offroadtoybox.com/tire/Old%20Side.jpg
Quad with Kenda tires
http://www.offroadtoybox.com/tire/New%20Angle.jpghttp://www.offroadtoybox.com/tire/New%20Side.jpg
Front side by side
http://www.offroadtoybox.com/tire/Front%20Comp.jpg
http://www.offroadtoybox.com/tire/Front%20Closeup.jpg
http://www.offroadtoybox.com/tire/Front%20Side%20Comp.jpg
Rear side by side
http://www.offroadtoybox.com/tire/Rear%20Comp.jpg
http://www.offroadtoybox.com/tire/Rear%20closeup.jpg
http://www.offroadtoybox.com/tire/Rear%20Side%20Comp.jpg