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OK...You all may think I'm nuts but I have an 04 Grizz with 27" Mud Lites. I also have an 05 Grizz with stock 25". I put a tape measure on both and pretty much got the same measurments. Floor Boards were both at 13". Front bumpers were 29" to the center of the big bar. The rear rack was about 1" higher (36" v 37") on the 04, to the center of the little hole in the middle of the rack.
seems like with the bigger tires there would be more clearance. This seems really strange. Measure for yourself and see what you come up with.
 

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one is new the other one is not.

the shocks r probibly a bit more comprest on the old one.

i changed from bearclaw 25" to itp 589 27", and gaind 2".
i put the two tyres mounted on rims and pressurised and the differens was 4".
 

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rob i dont know if i understand u right?

but dosent the quad get more ground clerens when u "up" the preloade, the springs get "shorter" but have more tension in them so the puch the shock apart more?
 

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Tread wear makes a big differance. If you have older 27s and newer 25s they will be closer to equal in actual size. Also, some tire companies claim their tires are bigger than they actually are. A lot of 26" and 27" tires are closer to the 25" stock tires. Air preasure will also make a big differance and so will the side wall thickness and width of the rim.
 

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With my new 27" 589's I think I gained almost 2"? I couldnt get both loading ramps under the quad before but now I can with room to spare......Irv
 

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I have read over and over that ITP measure up short of what they claim in height. I installed a set of 26" XTRs and gained more than a full inch of clearance in the rear, about half of that in the front.They have a flater tread face with less sagging. The stock tires had a very rounded face but flattend out under the weight of the machine.
 
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