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<blockquote data-quote="Lee36328" data-source="post: 108691" data-attributes="member: 113"><p>Here's a good definition:-</p><p></p><p><span style="color: blue">Bump Steer:</span></p><p><span style="color: blue">A directional change in steering caused by road surface irregularities. As the suspension moves through jounce and rebound, changes in alignment at the front or rear wheels may alter the vehicle's path.</span></p><p></p><p>A comment on the impact of larger rims.</p><p></p><p>[color= blue]</p><p>Q: What wheels / tires should I get? I want to move up in size.</p><p></p><p> A: Larger wheels and ultra-low profile tires look cool, but as with lowering, there will be side effects as well. Large diameter wheels have a lot of mass at the rim, which wastes engine muscle to get rotating. Also, a large wheel/tire combo often ends up taller than stock in total height, which changes the final drive ratio of the car. This leads to slower acceleration, as well as speedometer error. <strong>Lastly, big rims with low-profile tires tend to wander, rather than track straight, as they are influenced by waves and bumps in the road surface</strong>[/color]</p><p></p><p>So, whether this is bump steer or not depends on how one interprets the definition. The fact remains, the larger the rims, and therefore the lower the tire sidewall, the more the tendency of the tire to follow the surface of the road because there is less sidewall to compress to absorb the irregularities. </p><p></p><p>The solution to this? Smaller rims -> taller sidewalls.</p></blockquote><p></p>
[QUOTE="Lee36328, post: 108691, member: 113"] Here's a good definition:- [color=blue]Bump Steer: A directional change in steering caused by road surface irregularities. As the suspension moves through jounce and rebound, changes in alignment at the front or rear wheels may alter the vehicle's path.[/color] A comment on the impact of larger rims. [color= blue] Q: What wheels / tires should I get? I want to move up in size. A: Larger wheels and ultra-low profile tires look cool, but as with lowering, there will be side effects as well. Large diameter wheels have a lot of mass at the rim, which wastes engine muscle to get rotating. Also, a large wheel/tire combo often ends up taller than stock in total height, which changes the final drive ratio of the car. This leads to slower acceleration, as well as speedometer error. [b]Lastly, big rims with low-profile tires tend to wander, rather than track straight, as they are influenced by waves and bumps in the road surface[/b][/color] So, whether this is bump steer or not depends on how one interprets the definition. The fact remains, the larger the rims, and therefore the lower the tire sidewall, the more the tendency of the tire to follow the surface of the road because there is less sidewall to compress to absorb the irregularities. The solution to this? Smaller rims -> taller sidewalls. [/QUOTE]
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