Tyre Sizes

J3nsn · 20th September 2011, 20:51

Sorry but another tyre question! The Tourer CDT I picked up last week came with 18 inch hairpins (think that's what you call them) and 225/40/18 tyres. After reading through the forum it seem that members run 225/45/18.

Is my car running the wrong size? I don't know what the original spec would have been so I am unable to to do a rolling circumference comparison.

This will either mean changing one worn tyre or all four!

BigRuss · 21st September 2011, 12:33

The correct size is 225/45/18, often the 225/40's are fitted because they're easier to get hold of and a lot cheaper.

Russ

J3nsn · 21st September 2011, 17:11

Thanks mate, its decision time then, change one or bite the bullet and change all four............quick inspection of bank account needed!

pab · 21st September 2011, 18:57

I have 40's on my 11 spokes,they will be replaced with the correct tyre at the next opportunity..

Tyre noise and ride quality is unacceptable.

J3nsn · 21st September 2011, 19:04

would have to agree on that, so four it is!

Unionjack · 5th October 2011, 21:05

Changing the rear pair to the higher profile first would be fine if you want to split the cost.

jcwatrichmond · 6th October 2011, 07:54

To make the ride more comfortable, you could sell your 18" hairpins and get some 16" wheels with thicker less expensive tyres with more bump absorbing.

JCW

Roverron · 6th October 2011, 17:01

Quote:

Originally Posted by jcwatrichmond

To make the ride more comfortable, you could sell your 18" hairpins and get some 16" wheels with thicker less expensive tyres with more bump absorbing.

JCW

Better mpg & performance as well with narrow section tyres.
Also, watch out for insurance issues with non factory sizes. You know what they are like for finding excuses not to pay out..!

20th September 2011, 20:51	#1
J3nsn Regular poster Rover 75 Tourer CDT Auto Join Date: Sep 2011 Location: Barnsley Posts: 51 Thanks: 0 Thanked 0 Times in 0 Posts	Tyre Sizes Sorry but another tyre question! The Tourer CDT I picked up last week came with 18 inch hairpins (think that's what you call them) and 225/40/18 tyres. After reading through the forum it seem that members run 225/45/18. Is my car running the wrong size? I don't know what the original spec would have been so I am unable to to do a rolling circumference comparison. This will either mean changing one worn tyre or all four! __________________ [SIGPIC][/SIGPIC] Lest We Forget

21st September 2011, 12:33	#2
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	The correct size is 225/45/18, often the 225/40's are fitted because they're easier to get hold of and a lot cheaper. Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

21st September 2011, 17:11	#3
J3nsn Regular poster Rover 75 Tourer CDT Auto Join Date: Sep 2011 Location: Barnsley Posts: 51 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks mate, its decision time then, change one or bite the bullet and change all four............quick inspection of bank account needed! __________________ [SIGPIC][/SIGPIC] Lest We Forget

21st September 2011, 19:04	#5
J3nsn Regular poster Rover 75 Tourer CDT Auto Join Date: Sep 2011 Location: Barnsley Posts: 51 Thanks: 0 Thanked 0 Times in 0 Posts	would have to agree on that, so four it is! __________________ [SIGPIC][/SIGPIC] Lest We Forget

21st September 2011, 18:57	#4
pab Banned MG ZT V6 190+ Join Date: Sep 2008 Location: Leeds Posts: 33,223 Thanks: 41 Thanked 1,614 Times in 1,416 Posts	I have 40's on my 11 spokes,they will be replaced with the correct tyre at the next opportunity.. Tyre noise and ride quality is unacceptable.

5th October 2011, 21:05	#6
Unionjack Newbie Rover 75 Tourer Join Date: Jul 2011 Location: North Staffs Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts	Changing the rear pair to the higher profile first would be fine if you want to split the cost.

6th October 2011, 07:54	#7
jcwatrichmond Loves to post Rover 75 1.8T 2003 Club SE Join Date: Jan 2009 Location: Solihull, Posts: 370 Thanks: 0 Thanked 0 Times in 0 Posts	To make the ride more comfortable, you could sell your 18" hairpins and get some 16" wheels with thicker less expensive tyres with more bump absorbing. JCW