17" Steel wheel?

[Wayne]

I pass my MOT with the wrong size spare in the boot.. But i guess thats not something they check 

This is all a bit off because where you think 5mm is nothing.

If I use the calculator it says my current width is 592 with 205/40/17

But my spare is 632 with a 205 55 16

6% difference. And its says there should be 2.5% difference max!

Ive got a spare 205/40/17 tyre so i just need a 17" wheel with 5x100   

Your running the wrong size tyres at the moment hence why your speedo is out.

205/50/17 or 225/45/17 is what you should have fitted.

[thatwillis]

Truee makes it lower tho. Whilest only being lowered 50mm (insurance wise) 

[Wayne]

Truee makes it lower tho. Whilest only being lowered 50mm (insurance wise) 

Makes little difference tbh but it is cocking your gearing and speedo up, also have you checked your insurance companies view on undersized tyres being fitted.

[Wazzzer]

width isn't the issue, it's the profile that affects the speedo

[thatwillis]

Truee makes it lower tho. Whilest only being lowered 50mm (insurance wise) 

Makes little difference tbh but it is cocking your gearing and speedo up, also have you checked your insurance companies view on undersized tyres being fitted.

Yeah true indeed

width isn't the issue, it's the profile that affects the speedo

My speedo shows me as going faster than i am. Which means I'm less likely to get caught speeding.. this theory

[Wazzzer]

true, speedos tend to do this anyway though

[Tazzy]

modern speedos are out as standard

theres a website that you input the details of your car, put what size wheels you have and it will tell you what size tyre you need, also tells you if youre changing size wheels that how much your speedo will be out by

[earlymk2]

My anni has 18"s from the factory and has a 16" spare.

[dazzifumi]

take the spare out and carry a can of tyre weld and stop being gay worrying about your spare wheel

[Wayne]

My anni has 18"s from the factory and has a 16" spare.

Same as mine then, 225/40/18's with a 16" spare