 | Home > Wheels & Tyres > Height of a 18” rim and tyre when on the car |
 
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| Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 741   
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Hi to all the peeps that have 18” rims on there cars.
I have a set of 18” going on soon and trying to decide on tyre size 265/65r18 or 285/60r18 Now the issue I have is my garage where the defender is parked has a garage door that I clear by about 1-2cm at present. On 7.5r16 tyres on the 5.5 std rims. So asking if you have 18” can i ask you to put a straight edge on the top of the tyre and measure from this to the floor. Then note the tyre type here and the measurement. I am leaning towards ko2’s but if they are actually a lot bigger than there stated size I won’t be able to get the defender into the garage. So may have to look at continentales or something else. Thanks in advance. Searching for my first Defender...and started just as Covid hit, so talk about timing. 5 months after starting the search I found it, and here is the details |
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23rd Jan 2021 11:40pm |
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| camelman Member Since: 27 Feb 2013 Location: Peak District Posts: 3317 
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Both of those tyre sizes are 800mm +/- 1mm
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23rd Jan 2021 11:44pm |
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| Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 741
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That’s there advertised diameter from the actual size but when on the vehicle and weight on them I doubt they will be 800mm high. That’s the measurement I need if possible. Searching for my first Defender...and started just as Covid hit, so talk about timing.
5 months after starting the search I found it, and here is the details |
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23rd Jan 2021 11:47pm |
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| Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 741
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Well the new rims are 9” wide, from a pressure point of view I at present have no idea what pressure these should run at, but that also valuable information to have, what do you guys run as pressure on these 18” Searching for my first Defender...and started just as Covid hit, so talk about timing.
5 months after starting the search I found it, and here is the details |
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24th Jan 2021 9:58am |
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| Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 741
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Measured my existing 7.5r16 today spare wheel looked like 80cm, but front and rear were 75/76 respectively, also looking at other web pages they say bfgoodridge always are under size so maybe they will clear fine. Would like to get at least one measurement if possible before I take the plunge Searching for my first Defender...and started just as Covid hit, so talk about timing.
5 months after starting the search I found it, and here is the details |
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24th Jan 2021 11:39pm |
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| Black Puma Member Since: 31 Jan 2015 Location: Sydney Posts: 175 
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Please share your findings if you make any progress on this. I am in the same position with only 15mm clearance in the garage. My present Goodyear MTR 16 85/235 tires after 70,000km have 8mm less tread than the unused spare.
I'm looking to change to 18" but am reluctant to have lowered springs just for garage access. Did you use the 'tiresize' resource? Just wonder how accurate it is: https://tiresize.com/comparison/ |
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1st Feb 2021 6:48am |
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| Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 741
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Sure I’ll share looks like I am going to have to bite the bullet and just do it as not got any replies to height.
All the tyre comparison sites I look at tell me the unloaded weight non tell me the loaded. From looking at other forums the jeep guys complain a lot about the ko2’s being undersized as they want 33” or 35” but get a inch smaller etc. Searching for my first Defender...and started just as Covid hit, so talk about timing. 5 months after starting the search I found it, and here is the details |
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1st Feb 2021 7:51am |
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| Black Puma Member Since: 31 Jan 2015 Location: Sydney Posts: 175
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Ok, I see the point. Even if the tyres on the website are same diameter, when inflated 18" may need more PSI than 16" - less bend in the sidewall, and in theory taller.
So yes, a real world measurement. But it would need to be a forum member with newly installed tyres for a helpful measurement. |
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1st Feb 2021 1:54pm |
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| Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 741
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Also side wall stiffness affects it. Searching for my first Defender...and started just as Covid hit, so talk about timing.
5 months after starting the search I found it, and here is the details |
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1st Feb 2021 2:09pm |
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| DAZ110 Member Since: 06 Dec 2007 Location: East Sussex Posts: 2003 
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Race.it:
Ok, bit of information for you: On my 2011 Defender 90 2.4 I’ve got 9x18 twisted wheels with 265/65/18 BFG All-Terrain tyres. (That’s the older style BFG’s) Nearside front and back measures 785mm from top of tyre to ground and Offside front and back measures 780mm. Tyre pressures are set at 32psi all round. I have standard springs and shocks but I have fitted sprung isolators to the top and bottom of the springs. Guessing I’ve probably done about approximately 50,000 miles on these tyres. With about approximately 7-8mm of tyre thread left on them. Think the overall height of the Defender at the rear of the vehicle is about 1980 mm. I would think a 110 would be taller than this.?  Click image to enlarge Don’t know if any of that helps? |
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2nd Feb 2021 8:17pm |
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| Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 741
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That’s really good information thanks.
It may fit, the 110 is a little heavier, prob just will go ahead and try to fit them Searching for my first Defender...and started just as Covid hit, so talk about timing. 5 months after starting the search I found it, and here is the details |
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2nd Feb 2021 8:39pm |
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| DAZ110 Member Since: 06 Dec 2007 Location: East Sussex Posts: 2003
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What tyre size are you going for then?
Seem to remember that when I had my 2007 110 XS CSW the total height of the vehicle was 2040 mm. |
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2nd Feb 2021 8:47pm |
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| Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 741
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265/65r18 bf goodridge ko2’s
Think height at present is 203cm according to the documentation on the car, let’s see if I am crying tomorrow after smashing the roof on the garage door Searching for my first Defender...and started just as Covid hit, so talk about timing. 5 months after starting the search I found it, and here is the details |
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2nd Feb 2021 9:09pm |
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| DAZ110 Member Since: 06 Dec 2007 Location: East Sussex Posts: 2003
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I had 2040 on the 110 with the same wheels/tyres that are now on my 90.
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2nd Feb 2021 10:03pm |
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