 Scrub radius on original tire/wheel setup?, Anyone know the actual value? |
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| chmillman |
 Oct 20 2024, 02:55 AM
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#1
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Newbie  Group: Members Posts: 38 Joined: 15-June 24 From: Switzerland Member No.: 28,183 Region Association: Europe  |
Just out of curiosity...
Anyone know what the original designed-in scrub radius on a stock 914 with 5 1/2J x 15 wheels and 165R15 tires is? |
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| chmillman |
Oct 23 2024, 10:52 AM
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#2
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Newbie Group: Members Posts: 38 Joined: 15-June 24 From: Switzerland Member No.: 28,183 Region Association: Europe |
Nobody?
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| 930cabman |
Oct 23 2024, 11:26 AM
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#3
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Advanced Member Group: Members Posts: 3,618 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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QUOTE(chmillman @ Oct 23 2024, 10:52 AM)  Nobody? Can you define "scrub radius" |
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| GregAmy |
Oct 23 2024, 12:23 PM
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#4
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Advanced Member Group: Members Posts: 2,388 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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The definitions are out there.
But why do you care? Especially for a street car. It's not like you can do anything about it, especially on a strut suspension. If you want to keep it the same as stock, use stock size wheels (and offsets) and tires. |
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| chmillman |
Oct 23 2024, 02:08 PM
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#5
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Newbie Group: Members Posts: 38 Joined: 15-June 24 From: Switzerland Member No.: 28,183 Region Association: Europe |
QUOTE(GregAmy @ Oct 23 2024, 12:23 PM) But why do you care? First line in the first post... "Just out of curiosity" |
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| jd74914 |
Oct 23 2024, 03:17 PM
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#6
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Its alive Group: Members Posts: 4,807 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
I made a Lotus Shark model of the stock geometry [while on my way to modifying the geometry]-I should be able to dig it out in the next few days and can output a plot for you.
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| Front yard mechanic |
Oct 23 2024, 08:39 PM
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#7
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Senior Member Group: Members Posts: 1,219 Joined: 23-July 15 From: New Mexico Member No.: 18,984 Region Association: None
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The way 914s hug it’s got to be negative
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| anderssj |
Oct 24 2024, 05:51 AM
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#8
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Dog is my copilot... Group: Members Posts: 1,699 Joined: 28-January 03 From: VA Member No.: 207 Region Association: MidAtlantic Region
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Wheel offset also affects scrub radius—moving wheel/tire centerline outboard increases scrub radius, while moving wheel/tire centerline inboard decreases scrub radius.
Changing from ARE alloy wheels (slightly less offset than OEM) to factory Pedrinis changed the feel of the car a little bit. A little less agile (“darty”), a little better holding a straight line on bumpy roads. |
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