20s back to 18s
01-27-13, 04:45 AM
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20s back to 18s
My car use to have a mind of its own when I'd hit cracks or drive across train tracks. The steering would get supper loose and turn to the right. I've swapped them for 18s and the problem went away. I don't know if is the nature of the 20s or the tires. I got over 40k on the tires before the inside fronts were down to the belts. The 40k is a lot , so I'm thinking they are hard cheap tires. Are these Concept One rims worth trying to sell or should I just give them to the shop? Do your 20s makes your sc430 pull when you go over tracks?
01-27-13, 06:49 PM
#2
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The main reason why you had those steering problems with 20" could be cause by the offset of the 20" rims.
Aggressive offset looks good because it pushes the rims and tyres out to the fenders. But the downside is that it effects the cars handling.
When going for a +1, +2 or +3 rim upgrade you need to keep the offset as close as possible to the stock setup. Changing the offset will adversely impact suspension geometry, degrade handling and place unintended loads on suspension parts.
Aggressive offset looks good because it pushes the rims and tyres out to the fenders. But the downside is that it effects the cars handling.
When going for a +1, +2 or +3 rim upgrade you need to keep the offset as close as possible to the stock setup. Changing the offset will adversely impact suspension geometry, degrade handling and place unintended loads on suspension parts.
01-28-13, 03:58 AM
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The main reason why you had those steering problems with 20" could be cause by the offset of the 20" rims.
Aggressive offset looks good because it pushes the rims and tyres out to the fenders. But the downside is that it effects the cars handling.
When going for a +1, +2 or +3 rim upgrade you need to keep the offset as close as possible to the stock setup. Changing the offset will adversely impact suspension geometry, degrade handling and place unintended loads on suspension parts.
Aggressive offset looks good because it pushes the rims and tyres out to the fenders. But the downside is that it effects the cars handling.
When going for a +1, +2 or +3 rim upgrade you need to keep the offset as close as possible to the stock setup. Changing the offset will adversely impact suspension geometry, degrade handling and place unintended loads on suspension parts.
01-29-13, 02:27 AM
#5
Intermediate
Going from 18" to 19" is +1
going from 18" to 20" is +2 etc.
For example, if your are going for 20" rims try to keep the offset as close to stock, that is +45 as possible so the geometry of the suspension does not get altered too much.
going from 18" to 20" is +2 etc.
For example, if your are going for 20" rims try to keep the offset as close to stock, that is +45 as possible so the geometry of the suspension does not get altered too much.
01-29-13, 04:04 AM
#7
Intermediate
When you change the offset of the rim from stock to something else you also change the scrub radius. If the offset is extreme compare to stock, then you get all sorts of steering issues like tram lining, or it feels like someone is pull against the steering wheel when you hit a bump on the road etc.
As you can see, if everything else being stock and BY just changing the rim offset, it changes the scrub radius point.
No point me trying to explain but here is the URL
http://en.wikipedia.org/wiki/Scrub_radius
http://www.miata.net/garage/offset.htm
As you can see, if everything else being stock and BY just changing the rim offset, it changes the scrub radius point.
No point me trying to explain but here is the URL
http://en.wikipedia.org/wiki/Scrub_radius
http://www.miata.net/garage/offset.htm
Last edited by gripau1; 01-29-13 at 04:09 AM.
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