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What size dual sport tires for my XR4?

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My current back is a 110-100 18, front is a 90-100 21. I need DS tires so am getting Kendas and they are listed like they used to be back when at 400 18 325 21 and such so what size should I get? Don't want the widest of both either....so stock replacement sizes.

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Actual inflated tire size varies greatly. Have a look at DennisKirk where they list detailed spec's of many tires.

 

Your current rear tire is 110mm wide which is about 4.3in, so a 4.25-18 would be closest.

Front tire is 90mm which is about 3.5in, but I would go 3.25-21 because I haven't seen Kendas in 3.50-21 anyway.

 

Metric tire sizes are width/aspect ratio in millimeters - wheel size in inches! So 110/100-18 is 110mm wide, 110mm tall and 18 inch wheel.

 

Rocky Mtn seems to have good choices and prices: http://www.rockymountainatvmc.com/t/742/Dirt-Bike-Tires-All?st=369

Shinko 244 and Kenda K270 are similar price and popularity wise. Kendas are available in more and better sizes.

I would go Kenda K270 3.25-21/4.50-18 on an XR4. They also have 120/80-18 which would work fine too.

 

If you're riding mostly off-road there are many DOT approved knobby tires.

 

enjoy!

Edited by NCSteve

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My current back is a 110-100 18, front is a 90-100 21. I need DS tires so am getting Kendas and they are listed like they used to be back when at 400 18 325 21 and such so what size should I get? Don't want the widest of both either....so stock replacement sizes.

 

I just put a Kenda K270 on the back of my 400. I got the 5.10 x 18. It is the exact same width and maybe a touch shorter than a fresh Pirelli 110/100 MX extra knobby tire. Kenda tires run small, I would suggest getting the 5.10 on the back to match stock tire dimensions the closest. Plus, more rubber down = more traction.

 

For a point of reference, a 110/100 tire is usually around 130-135mm wide from knob edge to knob edge. When they list the size of them as a full aspect ratio ( xxx/100), that is usually the carcass, not including knobs. When they list less than a full aspect ratio, like a 130/80 for example, that is overall size. a 130/80 Michilen tire is equal in actual size to a 110/100. Both are approx. the same overall size as a 5.10 Kenda K270.

Edited by michigan400
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Well, I am on a tire quest and this got me looking and comparing again. Kenda's website has a nice comparison:

 

http://www.kendatire.com/en/motorcycle/dual-sport/k270-dual-sport/

 

I notice the 3.00-21 is 6 ply, the 3.25-21 is 4 ply and 5.10-18 is 6 ply, 120/80-18 is 4 ply, the 5.10 is an inch taller and 4/10 in wider than the 120/80 and DK says the 5.10 weighs @ 15.7lb, the 120/80 @ 10.2lb.

 

For comparison and IRC GP110 5.10-18:

 

Inflated Width /Measuring Rim Width: 5.39 in./3.00 in.
Inflated Diameter: 26.73 in.
Acceptable Rim Width(s): Not Available
Deepest Tread Depth: 13/32 in.
Directional Arrow: Yes
Speed Rating: S-Rated up to 112 MPH

 

That's a 5 ply tire, weighs 13lb. Rim width and tire pressure will affect overall dimensions too, so assuming all are equal....

 

Sidewall ID Information:
Michelin T63 130/80-18 M/C 66S

Dimensions: 
Inflated Width /Measuring Rim Width:
 5.08 in./3.00 in. 
Inflated Diameter: 26.18 
Acceptable Rim Width(s): 3.00 in. 
Deepest Tread Depth: 21/32 in. 
Balance Dot: No 
Directional Arrow: Yes 
Speed Rating: S-Rated up to 112 mph 

 

That's a 6 ply on a 3" rim, weighs @ 13lb.

 

Sidewall ID Information:

Michelin T63 120/80-18 M/C 62S

Dimensions
Inflated Width/Measuring Rim Width:
 5.16"/2.75"
Inflated Diameter: 26.42"
Acceptable Rim Width(s): 2.50"-3.00"
Deepest Tread Depth: 21/32 in.
Balance Dot: No
Directional Arrow: Yes
Speed Rating: S-Rated up to 112 mph

 

That's 4 ply on a 2.75" rim, weighs @ 12.6lb

 

 

  •  ID Information: Dunlop Geomax MX51 110/100-18 64M 

    Dimensions: 
    Inflated Width /Measuring Rim Width:
     5.00 in./2.15 in. 
    Inflated Diameter: 27.09 in. 
    Acceptable Rim Width(s): 2.15 in. 
    Deepest Tread Depth: 12/32 in. 
    Balance Dot: One Yellow 
    Directional Arrow: No 
    Speed Rating: M-Rated up to 81 mph 

 

I think that's a 4 ply and on a 2.15" rim, weighs @ 13.1lb.

 

"    a 130/80 Michilen tire is equal in actual size to a 110/100. Both are approx. the same overall size as a 5.10 Kenda K270"

That doesn't make a lot of sense to me, nor the part about carcass, not including knobs, etc. If it's the voice of experience, I'll have to defer because hard to verify with just some research.

 

I just mounted a T63 110/80-18 on my 250R with 1.85 rim and it measures 115mm (4.5in) OD knob to knob @ 12psi which is @ 2/10" smaller than DK says it is on a 2.5" rim.

And DK says a Dunlop MX71 110/90-18 on a 1.85" rim is @4.9in wide:

 

 

  • Sidewall ID Information:
    Dunlop Goemax MX71 110/90-18 61M

    Dimensions
    Inflated Width/Measuring Rim Width:
     4.88"/1.85"
    Inflated Diameter: 26.10"
    Acceptable Rim Width(s): 1.85
    Deepest Tread Depth: 16/32"
    Balance Dot: One Yellow
    Directional Arrow: Yes
    Speed Rating: M-Rated for speeds up to 81 MPH

 

Overall, from the tires I've been looking at, it seems Dunlop is very consistent with actual dimensions and stated tire sizes, Kendas do seem to run small and Michelin T63 are pretty consistent, but not necessarily compared to their other tires.  :crazy:  Not sure what to conclude from all that though. 

 

enjoy!

Edited by NCSteve

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