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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610   
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Morning Rob,
Changing the rolling radius of the wheels and tyres will affect the speedo. I had the same conundrum when considering wheel/tyre replacement and decided to go an inch smaller on the wheel diameter and bigger boots to maintain original rolling radius. Not sure if the link still works but if it does have a play and it will calculate how far the speedo may/or may not be out when and if you swap. http://www.miata.net/garage/tirecalc.html If you go through life with your head in the sand....all people will see is an ar5e!! Treat every day as if it is your last....one day you will be right!! |
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14th Apr 2013 8:40am |
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| RobKeay Member Since: 19 Jul 2009 Location: Stafford Posts: 1585 
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Nice one.
I've run that test and I would be -0.05 out and the revs would be 3rpm higher. I would guess this would not make a great deal of difference! Not sure what to do, I have a lot of interest in my svx alloys and I really hate how the defender drives on the continental tyres. So wouldn't cost me a great deal to upgrade. |
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14th Apr 2013 8:47am |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3645 
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I like the 18inch khan alloys, go for it DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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14th Apr 2013 10:33am |
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816  
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Rob, what is exactly wrong with the Contis? I thought if you are mainly road driving, they were actually amongst the best available now. You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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14th Apr 2013 6:19pm |
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| RobKeay Member Since: 19 Jul 2009 Location: Stafford Posts: 1585
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They don't grip in the wet as well as my old bfg KM2 tyres. Once you put a trailer on the back forget going into fields. They slip about on the snow were bfg just cruise through.
They are a compromise tyre they are alright but I would like something better as I drive alot of miles on all conditions. They are a massive improvement on the general grabbers land rover used to fit which are the worst tyre in the world. I am just very fussy about tyres and don't mind spending the money on them. It's nice to be able to push the 90 without the tyres letting you down. Also being able to stop quickly, especially when towing and I feel tyres have a major part to play. Back in the days of 300tdi land rover fitted bfg all terrains which I am a big fan of. I feel having 18 inch wheels gives you less side wall so would expect less tyre movement. Sorry that's my ten pence worth of tyre talk sorry to bore everyone. |
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14th Apr 2013 6:28pm |
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| RobKeay Member Since: 19 Jul 2009 Location: Stafford Posts: 1585
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Has anyone got any experience with fitting 18 inch wheels to a defender??
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14th Apr 2013 9:04pm |
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| Killer90 Site Sponsor Member Since: 09 Oct 2011 Location: Hertfordshire Posts: 6478 
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 I run 18's and prefer them to my 20's i used to have. I think there becoming a popular size and the kahn wheels even though expensive  look great CSK Automotive
www.cskautomotive.co.uk Like us on Facebook - www.facebook.com/csklr Follow us on Instagram - @cskautomotive |
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14th Apr 2013 9:35pm |
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| RobKeay Member Since: 19 Jul 2009 Location: Stafford Posts: 1585
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Yeah they are dear but my current wheels and tyres could fetch a few quid so change over might not be too bad.
Going to ask insurance what the difference would be. How do you get on with yours off-road?? |
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14th Apr 2013 9:42pm |
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| Killer90 Site Sponsor Member Since: 09 Oct 2011 Location: Hertfordshire Posts: 6478
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Offroad
Whats that  
Mines on skinny tyres and never touches dirt so couldn't tell you, but a sensible set of bfg AT's would work a treat on and offroad Its nice when you have the originals to sell, it doesnt feel so bad then
Customer last week had them fitted to his 90
 Click image to enlarge CSK Automotive www.cskautomotive.co.uk Like us on Facebook - www.facebook.com/csklr Follow us on Instagram - @cskautomotive |
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14th Apr 2013 9:49pm |
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| RobKeay Member Since: 19 Jul 2009 Location: Stafford Posts: 1585
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Yeah saw your pictures, that's what prompted me to look further into it. Was thinking about getting 110 but going keep 90 and do a few mods that would make it more fun.
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14th Apr 2013 9:53pm |
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| chadjizz Member Since: 25 Apr 2012 Location: sussex Posts: 559  
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i have 18ins on and they are with in 4/5mm the same height (taking into consideration the tyres) as what i was running before. (before hd wolfs on crosscontacts 235/85/16 - now twisted performance 18ins on copper ltz 285/60/1
 and in fact that difference is 4/5mm lower on the 18ins!!! wont be when i get some 275/75/18 copper stt's  |
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15th Apr 2013 5:45pm |
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| RobKeay Member Since: 19 Jul 2009 Location: Stafford Posts: 1585
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That's a big tyre you'll have to post some pics!
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15th Apr 2013 6:05pm |
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| chadjizz Member Since: 25 Apr 2012 Location: sussex Posts: 559
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correction they are 275 / 70 / 18.
wont be getting them till i have warn the ltz's out though  cant justify changing tyres when they have only done 3000 miles... |
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15th Apr 2013 7:42pm |
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| Likeomg Member Since: 29 Jun 2012 Location: Lake District / Newcastle Posts: 2642 
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whats the biggest size bfg's you can get on a standard height defender on kahn's? 265/65/r18?
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7th Sep 2013 2:01pm |
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