Higher Profile Tyres on 18" wheels

hancym · Aug 9th, 2011, 20:05

It occurred to me today whilst looking at my car in the pub car park today that there's a load of room under the wheel arch.

I have 18" BBS Wheels with the standard 235/60 R18 tyre but I've read a few comments here about the benefits of 17" wheels due to the better ride from the higher profile.

I was just wondering if anyone has experimented with putting anything higher than a 60 Series tyre on an 18" XC90 wheel

Bill Edmondson · Aug 9th, 2011, 20:13

Get someone to hold your steering on full lock, then poke your arm round the back and see how close the tyre gets to your inner arch, I bet its not much.

t5_monkey · Aug 9th, 2011, 20:39

Quote:

Originally Posted by hancym

It occurred to me today whilst looking at my car in the pub car park today that there's a load of room under the wheel arch.

I have 18" BBS Wheels with the standard 235/60 R18 tyre but I've read a few comments here about the benefits of 17" wheels due to the better ride from the higher profile.

I was just wondering if anyone has experimented with putting anything higher than a 60 Series tyre on an 18" XC90 wheel

it'll screw up your speed reading.. and possibly the ESP

hancym · Aug 9th, 2011, 21:20

I guess your right by about 6% I calculate. So my speedo would be about 3MPH out at 50 MPH.

Clan · Aug 9th, 2011, 21:27

and the gearing would be higher meaning the engine would feel less lively ... and probably use more fuel due to you demanding more power all the time .

t5_monkey · Aug 9th, 2011, 21:34

I ran 18's with a 3% larger rolling radius.

You'd be surprised how much LESS lively the car feels.

hancym · Aug 10th, 2011, 06:31

Quote:

Originally Posted by t5_monkey

I ran 18's with a 3% larger rolling radius.

You'd be surprised how much LESS lively the car feels.

Did you have any other problems relating to inacurate speedo etc?

galloot633 · Aug 10th, 2011, 13:52

Quote:

Originally Posted by hancym

Did you have any other problems relating to inacurate speedo etc?

arent our speedos about 5% optomistic ? in which case theyd become more accurate with a 3% bigger rolling diameter
dave

owenfackrell · Aug 10th, 2011, 14:32

Mines pretty spot on it reads about 1 mph faster than gps at 70.

TruckbusUK · Aug 10th, 2011, 15:50

Quote:

Originally Posted by owenfackrell

Mines pretty spot on it reads about 1 mph faster than gps at 70.

Agreed, mine is approx 2mph slow at 70MPH (measured on a flat straight road using a tomtom)

That is to say if the car reads 72MPH, then the tomtom states 70MPH.

Aug 9th, 2011, 20:05	#1
hancym Master Member Last Online: Feb 25th, 2024 15:40 Join Date: Jan 2011 Location: Norwich	Higher Profile Tyres on 18" wheels It occurred to me today whilst looking at my car in the pub car park today that there's a load of room under the wheel arch. I have 18" BBS Wheels with the standard 235/60 R18 tyre but I've read a few comments here about the benefits of 17" wheels due to the better ride from the higher profile. I was just wondering if anyone has experimented with putting anything higher than a 60 Series tyre on an 18" XC90 wheel

Aug 9th, 2011, 20:13	#2
Bill Edmondson AV Guru Last Online: Nov 19th, 2011 14:05 Join Date: Jun 2011 Location: Brighton	Get someone to hold your steering on full lock, then poke your arm round the back and see how close the tyre gets to your inner arch, I bet its not much. __________________ Careful, you could have somebody's eye out with that

Aug 9th, 2011, 21:27	#5
Clan Experienced Member Last Online: Yesterday 22:32 Join Date: Jun 2007 Location: L/H side	and the gearing would be higher meaning the engine would feel less lively ... and probably use more fuel due to you demanding more power all the time . __________________ My comments are only based on my opinions and vast experience .

Aug 9th, 2011, 21:34	#6
t5_monkey Monkeying Around Last Online: Mar 13th, 2016 20:05 Join Date: Mar 2010 Location: York	I ran 18's with a 3% larger rolling radius. You'd be surprised how much LESS lively the car feels. __________________ Release the Monkey inside of you >>> Trunk Monkey

Aug 9th, 2011, 21:20	#4
hancym Master Member Last Online: Feb 25th, 2024 15:40 Join Date: Jan 2011 Location: Norwich	I guess your right by about 6% I calculate. So my speedo would be about 3MPH out at 50 MPH.

Aug 10th, 2011, 14:32	#9
owenfackrell Premier Member Last Online: Feb 4th, 2024 19:04 Join Date: Dec 2009 Location: southampton	Mines pretty spot on it reads about 1 mph faster than gps at 70.

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