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Old 12-07-2010, 02:10 PM   #1 (permalink)
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Default bumpy and shaky ride on highways

hi guys...any of u knows how to make the jimny ride more comfortable on highways?
1. will a softer spring work? but this will affect offroad performance...
2. lower tire pressure? (im running 35psi on 255 60 15 cooper cobra tires).

any other ways?? please help as i feel nauseous everytime i drive the jimny on highways!
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Old 12-07-2010, 05:35 PM   #2 (permalink)
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35psi sounds high - what does it say on the tire placard (usually on the driver's side door jamb) for that size tire?
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Old 12-07-2010, 09:54 PM   #3 (permalink)
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hi fordem...i did not check...but i don't think there is a tire pressure recommendation on the tire placard for a 255.
Stock came with a 205 tire...
Would the tire pressure be the same for a 205 and a 255?
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Old 12-08-2010, 11:56 AM   #4 (permalink)
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Stick with the placard pressures. The placard pressures always give a decent mix of comfort, tire life, and handling, no matter what size tire.

You can vary those pressures to get better performance in certain areas, but for general driving on the street, the placard pressures will give you a good mix.

I've met few tire technicians who actually know much about tires, beyond installing and repairing them. Often, they don't know much about installing and repairing them...
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Old 12-08-2010, 06:34 PM   #5 (permalink)
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great advise guys!
i looked at the tire placard and saw that recommendation is 23psi on front tires and 29psi for the rear. A very big difference from 35psi!

tried the recommended pressures but found it to be too soft...more comfortable ride, but harder to steer...mileage is also bad.

finally i used 28psi on front and 30 psi on rear tires.
i am very happy with the ride now...more comfortable on highways, tires grip the paved roads better.
Mileage is around 10kms/ liter....is this normal for a jimny?

so i am happy now with my 255 tires and the pressures!
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Old 12-17-2010, 02:31 AM   #6 (permalink)
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Mine still has the original 205 tires but I'm thinking of replacing with bigger ones. To have a 255, did you lift your body? If I will not modify my springs to lift the body, would you know what is the maximum size I can go without them rubbing on the fenders?
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Old 12-19-2010, 01:56 PM   #7 (permalink)
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hello albertini...
without lifts 255/60/15 is the biggest tire you can fit in my opinion...
are you going for a taller tire? or a wider tire?
i was going for a wider tire this is why i chose 255...
generally, the tire experts recommend only a 3% difference in size from the original tire, so as not to affect too much your odometer.
check out these websites if your planning to change tires:
Tire size calculator
Tire Size Calculator - tire & wheel plus sizing

i hope this helps...
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Old 12-20-2010, 11:05 PM   #8 (permalink)
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Hi Guillen9494,

Thanks very much for your advice. A tire dealer was offering me a 225. I want wider tires just like you. I will check out a 255. Thanks for giving me the websites.
BTW, do you need a steering damper for your wider front tires?
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Old 12-22-2010, 02:06 AM   #9 (permalink)
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i'm a real newbie in terms of 4WD and modifications... i hope the veterans can help you out (and me too) in this forum.

but i think we do need steering dampers...
when i changed to 255, i felt wobbles on 70kph and 110kph speeds.
with the original 205, i also felt a little wobble at these speeds, although not as much when i changed to 255.

can anyone help us out guys??
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Old 12-22-2010, 08:42 PM   #10 (permalink)
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Make sure your wheels are aligned properly and your tires are ballanced. A panhard bar is good for keeping the front axels centered under the chassis, but for wheel wobble, a steering damper works to keep you from having the wheels jerked around when you hit ruts or bumps. If you have lifted or altered the suspension so that the drag link and tie rod aren't located or oriented properly you will get bump steer when the suspension compresses, but that's not going to cause wheel wobble.
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