so i was reading somewhere that if  i get larger tires my speedometer and and gearing ratio would be all screwed up and such,, what do you do about that and what other problems occur?     i was told that on stock body, i could go as large as  235/75/r15

also do i need new wheels for these tires?

what type of zuki is it? i know kiks and trackers come with 15in rims stock, and it will be a little off but i dont think it would event be noticable. but they make speedo reducers,  you can buy, i had to put one on my sub.  and gear ration it will be off a bit but not really worry about it unti you get up to 30's or so, but that is my experiance from "bigger 4x4's" i am new to the zuki world, but the ability to chase 4whelers, and  go places bigger rigs simply cannot go. (: priceless

235/75 won't make a huge difference to the gearing. Stock tyres (most are 195/80) are around 27" diameter and the 235s would be around 30". It varies between manufacturer and depends also on rim width.  27 to 30 is just over a 10% increase and your speedo probably reads a bit high anyway. Its pretty easy to check your speed with a GPS (borrow one if you haven't got one). Then when you know how far out it is as a % you can just correct for it with a bit of mental arithmetic or work it out at a few fixed points, write it on some paper and tape it somewhere handy. I don't think anyone bothers to correct their speedo or gearing unless they fit much bigger tyres in which case aftermarket ring and pinions are the way to go.
Some people have had clearance issues with 235s, it depends on the backspacing of the rim. The more backspacing the more they are likely to rub on the frame or footwells. The less backspacing the more likely they are too rub on the fender, you are changing the arc in which they travel. I'm sure someone can recommend a suitable backspacing, rims should be at least 6" wide.

Our speedo was off by about 5mph on stock tires (215s).

When we upgraded to 235s it became dead on accurate.

~Nate

I upgraded to 30" tires and mine is only slightly off. I do notice the power drop from turning the bigger tires though.  

i also have 30"'s on mine when im doin 100 kmh, my GPS says im doin about 104kmh so its not that far off....

can i use my stock rims for this application...  with the 235 instead of my 205's

can i use my stock rims for this application...  with the 235 instead of my 205's

yes, you can use your stock rims, but the 235s will tend to crown ( center tred area higher than shoulder tred area ) You can compensate for the crowning by running slightly lower air preasure than you would in the 205s. With 235s you will definitly notice a loss of power going up long hills unless you go Weber carb - header- KN air filter. Any or all of these will improve your overall stock engine performance. Down side...they cost money. If you keep your motor stock 215x70x15 are your best bet for overall performance.. 215x70x15 are available special order thru Kelly Springfield Tire, with a fairly aggressive winter snow tred. Only a few tire companies offer 215x70x15 with an agressive tred. They work especially well on cheep 7x15 white spoke wheels, about $30 ea. The slightly wider wheel will also improve cornering. Beyound 235s you will need gear changes of some kind.

^^^Not so much.

i guess i'm the resident 235 guy, since most of the rigs here ride in the 30's range and average at least one form of suspension oand/or body lift.

my 1995 Tracker is 100% bone stock.  i run 235 BFG A/T's on stock Geo Tracker "daisy' wheels (complete with plastic chrome wheel skins  )

now when first installed i lost alot of top end Vs. the stock 205's.  where my tracker effotlessly flew on the freeway as high as (no kidding) 95 mph on my 205's,  The 235's took alot away.  with the 235's the tracker pretty muchlost it's steam around 75 mph....which isn't too bad a cruising speed on most highways....if you can tolerate the high RPM's

235's also took a huge bite out of my fuel economy.  Not super bad.....but the trackers thirst was very noticable Vs. the 205's.

my remedies as of one year later.  i took out the lower "box" portion of the air filter "airbox" housing and cut out 3 of the 4 sides, making more like just a frame.  Bought a drop-in K&N filter and put it all back together.  and added the Calmini cat-back exaust for 150 bucks.  the tracker is still all stock (i.e. no lifts or aftermarket rims) and it FLIES!  on a flat surface in 5th gear I have buried the needle...so that's at least 85+ mph.
and i've more than regained my fuel economy.  i now get better gas mileage now than i did all stock with 205's.  you don't need extreme mods like weber carbs or anything like that.

my 235's have never rubbed or caught any part of the inner wheel well or frame.  it runs and turns just like stock tires.  And from my testing (driving next to a friend) the speedo is only 4.3 mph up from the norm. (45mph on the speedo is really like 49.5mph)  so when you think your going the speed limit...your actually speeding by almost 5mph.

but as for everything else everyone said they are right, keep then like 9 to 10 psi higher than the stock recomended tire pressure of the 205's.  A 215x70x15 is a much better balanced tire for non-lifted track/kicks.  Outside of Factory 15inch wheels the backspacing wil greatly change how the tire fits on the car.  and whatever else.

simple answer to your questions. Yes 235's fit on stock rims on a stock tracker. no problem.