Has anyone started a thread on running bigger tires for the X3? What fits? What works? What needs to be done? Clutch job? Lift? I couldn't get the search function to work. I'd like to run bigger tires on a DS.
big tire thread for X3??
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Rubicant
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FYI: Scrub radius is affected by wheel offset, not bump steer.
Sure it is... Scrub radius directly affects bump steer
Scrub radius is affected by wheel offset, which affects bump steer; so bump steer is affected by scrub radius - sounds like a question on the GMAT.
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I think some of you are misinterpreting the definition of bump steer. Bump steer is when the geometry is such that when the suspension cycles up and down it changes the toe angle. It isn't about getting feedback through the steering when you hit a bump. Hell, bump steer is measured in the shop with the wheels not even on the car.
I'm just ignorant, not misinformed since I was never really informed.
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If the suspension has any kind of bumpsteer in it to start with, wouldn't a wider offset wheel amplify the bumpsteer? X3 are great but I'm not sure there is no bump steer in it
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No, they are two unrelated things. You guys are confusing bump steer, which is a geometry problem, with steering feedback, which is an offset problem.
Of course you wouldn't want to have both problems at the same time.
From watching videos, I would say there is very little bump steer built into the geometry.
Of course you wouldn't want to have both problems at the same time.
From watching videos, I would say there is very little bump steer built into the geometry.
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Bumpsteer, like scrub radius, is simply a measurement. Its not a handling characteristic. For example, lets say you adjust the toe of your car at ride height to be dead nuts parallel. Then you bump the suspension all the way up and find that the tires are now 1 degree outboard. That means as the suspension cycles, the wheels are turning. This is bump steer. Its a function of the geometry between of the control arms and the steering linkage. No matter what kind of wheel you attach to this car, it will still turn 1 degree outboard as the suspension bumps up through its travel arc.
Entire books are written about the best way to engineer a car to make it handle a certain way in certain conditions. The goal of the designer isn't just to make bump steer, scrub radius, and other measurements zero. It is actually beneficial to design a certain type of bump steer into a car to make it handle a certain way in turns. A little bit of scrub radius is designed into cars to give the driver some feel for the road. Even if I were smart enough to describe all the possible design targets there wouldn't be enough room in a forum post to explain it all. Lastly, I haven't even cycled the front of my x3 yet to measure how much bump steer they designed into it at the factory. There is for sure some scrub radius built in even with a stock wheel, somewhere between .5 and .75" based on what I've measured.
Semantics I guess. I've always interpreted "bump steer" as an adjective to describe unwanted steering feedback.
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Did you have any issues running 32s on your xds? Any modifications? I'm debating between 30s and 32s, I'll prefer 32s, but I'm trying to do all of my research before I pull the trigger.
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Did you have to change out your clutch and any belt issues?32" STI Outback Max on the XDS. Needed 1.5" spacers on the back
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After using 30" and 31" tires, I wanted to try some 32's for the appropriate terrain. I went with the Arison Aftershock 32's. I have two sets of wheels in 4/3 and 5/2 offset. I put the 32's on my 4/3 set and will say it sucks. I got way too much steering feedback from this setup and the steering got much slower. Now this is in pretty rough rocky terrain so keep that in mind. I'll put the 32's on my 5/2 set next and hopefully that will be the winning setup. I'm temped to buy a 6/1 offset set as well which would put me back to stock. I haven't found the wider setup to be any better as this buggy is very stable already. The wide setup just seems to cause too much negative impact through the steering system/wheel.
I had some ITP Ultracross 31's on this 4/3 wheel and that was an ok setup but that ITP tire is very narrow as compared to other tires in the 10" wide typical sizing.
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I had some ITP Ultracross 31's on this 4/3 wheel and that was an ok setup but that ITP tire is very narrow as compared to other tires in the 10" wide typical sizing.
That is an awesome looking machine fstclyz. It looks fast just sitting there.
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whats the biggest tire anyone has run on the factory rim? and is the factory rim ok to run 32-33" tires on?
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whats the biggest tire anyone has run on the factory rim? and is the factory rim ok to run 32-33" tires on?
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