Wheel size

**shamus5178** · 22nd April 2009, 17:15

Lo all, quick question, I have standard 17" wheels fitted, am thinking (still trying to convince long haired sarnt major) about getting newer, nicer possibly bigger wheels.

If I go up to say 18 or 19" do I need to adjust any thing or do they just bolt on as per normal wheel change?

Will my turning circle be greatly reduced?

these may seem daft to people that know but its something I have never considered before and now I have been bitten by the modding bug, my life is over

**Pecojess** · 22nd April 2009, 17:49

they'll just bolt on m8, wont affect the car too much, ride may suffer a little mind u!!

**neverlandandy** · 22nd April 2009, 18:04

i got more road noise going up to 18's but that may just be down to the tyres

**shamus5178** · 22nd April 2009, 19:11

Cheers lads, now to find me a set of wheels........................................

**Guyver1** · 22nd April 2009, 19:52

Originally Posted by shamus5178

Lo all, quick question, I have standard 17" wheels fitted, am thinking (still trying to convince long haired sarnt major) about getting newer, nicer possibly bigger wheels.

If I go up to say 18 or 19" do I need to adjust any thing or do they just bolt on as per normal wheel change?

Will my turning circle be greatly reduced?

these may seem daft to people that know but its something I have never considered before and now I have been bitten by the modding bug, my life is over

Dont forget your speedo will be out aswell, but I believe you can get that TEC2 sorted mate

**KSD** · 22nd April 2009, 19:54

Originally Posted by Guyver1

Dont forget your speedo will be out aswell, but I believe you can get that TEC2 sorted mate

How come?

**Guyver1** · 22nd April 2009, 19:58

Originally Posted by KSD

How come?

In simple terms (so I can understand it)

if your 17" wheel is 36" around the circumfrence (complete guess)

a 19" wheel might 40" around the circumfrence

so the rolling circumference will be out by quite a margin

http://www.ajdesigner.com/fl_tire/tire.php

this site explains it in more technical style mate

In fact you can select your tyre and wheel size on that site and the difference between a 17" and 18" is actually close to 80mm longer circumference

**tom_p_2000** · 22nd April 2009, 20:03

Originally Posted by Guyver1

Dont forget your speedo will be out aswell, but I believe you can get that TEC2 sorted mate

depends on the overall diameter of the wheel/tyre combined

a 215/50/17 isnt a great deal different to a 235/35/19

**Guyver1** · 22nd April 2009, 20:06

Originally Posted by tom_p_2000

depends on the overall diameter of the wheel/tyre combined

a 215/50/17 isnt a great deal different to a 235/35/19

Yeah thats true, 0.1 mph speedo error aint too bad

**KSD** · 22nd April 2009, 20:08

Originally Posted by Guyver1

In simple terms (so I can understand it)

if your 17" wheel is 36" around the circumfrence (complete guess)

a 19" wheel might 40" around the circumfrence

so the rolling circumference will be out by quite a margin

http://www.ajdesigner.com/fl_tire/tire.php

this site explains it in more technical style mate

In fact you can select your tyre and wheel size on that site and the difference between a 17" and 18" is actually close to 80mm longer circumference

I didnt realise the speed sensor measured wheel speed, I thought it would sense the speed of the driveshaft but just had a blonde moment I think because it would have to measure wheel speed to communicate with the ABS control unit right? ie rapid decceleration of a wheel would cause the ABS to release the brake pressure on that wheel.