Lift Kit and 235/60/18 Tires
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Joined: Apr 2025
Posts: 416
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From: Padstow
Can't say but using a tyre size calculator and assuming the original tyre size is 215/55/18 the tyre will have a radius increase of say 1 inch. You be the judge. The speed will have an error 6% saying that cars read faster than they are actually travelling to comply with design rules so the real error is more likely 3%.
Watch your lift kit 1.5 inches is not much and should be fine but steering modifications can be a problem if not done right but in your case shouldn't need alteration.
For 1.5 inch it's probably only taller springs but sometimes they wan't to sell longer shocks. I have seen them bottom out and snap shock mounts off and bend shocks. If they try to seel then as a package make sure the compressed length is the same as the OE shocks.
I assume your in the US and have different rules to ours regarding these mods. Check them first.
Watch your lift kit 1.5 inches is not much and should be fine but steering modifications can be a problem if not done right but in your case shouldn't need alteration.
For 1.5 inch it's probably only taller springs but sometimes they wan't to sell longer shocks. I have seen them bottom out and snap shock mounts off and bend shocks. If they try to seel then as a package make sure the compressed length is the same as the OE shocks.
I assume your in the US and have different rules to ours regarding these mods. Check them first.
Last edited by Charlescrown; Apr 18, 2025 at 02:09 AM.
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Joined: Oct 2018
Posts: 10,594
Likes: 229
From: Northern California
When some member post info on dampener on various forums I often post they should at least catch up on shock design especially regarding Gas and or high-pressure dampeners. Some information posted reads more or less pre 1980's 
And raising or lower a vehcle concern that most don't consider but as mentioned is how it effects the steering engineered in a specific platform and model vehicle , that being the steering geometry which in most cases is very difficult to correct when altering factory ride heights by way of altering the suspension. Body lift kits seldom have that concern. But in the end, it is for the most part not necessarily a concern for the driving of a daily or basic street driven vehicle but should at least be mentioned. Now if you were road tracking or try to improve the handling and steering characteristics then it is a problem and a challenge to correct or learn to drive around the altered factory steering geometry.
As for the speedo being different from the actual road speed most of us will use a monitor that via GPS will show the vehicles correct speed and then you can compensate with the visual on the factory speedometer. I should mention that most of those formulas do not take in account for the tire design only the size. But that gets into another long drawn out subject that said the % that were stated are only accurate in the perfect scenario. in other words not a BIG concern!
Alway SAFTY check brakes ,chassis and suspension and always get an alignment after any alterations to the suspension.
And raising or lower a vehcle concern that most don't consider but as mentioned is how it effects the steering engineered in a specific platform and model vehicle , that being the steering geometry which in most cases is very difficult to correct when altering factory ride heights by way of altering the suspension. Body lift kits seldom have that concern. But in the end, it is for the most part not necessarily a concern for the driving of a daily or basic street driven vehicle but should at least be mentioned. Now if you were road tracking or try to improve the handling and steering characteristics then it is a problem and a challenge to correct or learn to drive around the altered factory steering geometry.
As for the speedo being different from the actual road speed most of us will use a monitor that via GPS will show the vehicles correct speed and then you can compensate with the visual on the factory speedometer. I should mention that most of those formulas do not take in account for the tire design only the size. But that gets into another long drawn out subject that said the % that were stated are only accurate in the perfect scenario. in other words not a BIG concern!
Alway SAFTY check brakes ,chassis and suspension and always get an alignment after any alterations to the suspension.
Last edited by Callisto; Apr 18, 2025 at 09:48 AM.
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Joined: Apr 2025
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Thanks for the welcome and everyone's response.
I should have provided more info initially. I want to do this so I can drive on dirt roads that I wouldn't want to risk damaging my stock CX-30 on. Not that I want to take it rock climbing, but I need the height to clear large ruts and rocks. I'm also thinking of adding a skid plate just in case I bottom out. I know increasing the height will reduce the handling qualities, but I've posed this question on other Mazda forums and It seems it has been done many times without any major negative effects.
Someone else installed the 1.5" lift kit and replaced his stock tires with 235/55/18 all terrain tires (the type I want) and they don't rub. So I'd like to go up one size larger to a 235/60/18, which at the same 9.3" width, gives another .5" in height. The stock tires are, 215/55/18, so the 235/60/18 would be an increase in width from 8.5" to 9.3" and an increase in diameter from 27.3" to 29.1 (.9" increase in ground clearance).
I should have provided more info initially. I want to do this so I can drive on dirt roads that I wouldn't want to risk damaging my stock CX-30 on. Not that I want to take it rock climbing, but I need the height to clear large ruts and rocks. I'm also thinking of adding a skid plate just in case I bottom out. I know increasing the height will reduce the handling qualities, but I've posed this question on other Mazda forums and It seems it has been done many times without any major negative effects.
Someone else installed the 1.5" lift kit and replaced his stock tires with 235/55/18 all terrain tires (the type I want) and they don't rub. So I'd like to go up one size larger to a 235/60/18, which at the same 9.3" width, gives another .5" in height. The stock tires are, 215/55/18, so the 235/60/18 would be an increase in width from 8.5" to 9.3" and an increase in diameter from 27.3" to 29.1 (.9" increase in ground clearance).
Senior Member
Joined: Oct 2018
Posts: 10,594
Likes: 229
From: Northern California
Off roading is slightly different than a Dailey driver. Just remember just because on any forum someone does a mod and claims no problems does not always mean it’s true. Most DIY in my experience won’t state problems or failed mods openly on any forum.
But with your last response giving more clarity and information sounds like you are going in the right direction.
post up pictures It sounds like a fun project.
But with your last response giving more clarity and information sounds like you are going in the right direction.
post up pictures It sounds like a fun project.
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