speedo with 18's

[l4v15]

hi. how far out will it put your speedo if you have 18's on the gti t? just wanted to know how far out mine will be. Also, when you lower the mk4 does it put the tracking, wheel alinement, camber etc out by much?

[richw911]

hi. how far out will it put your speedo if you have 18's on the gti t? just wanted to know how far out mine will be. Also, when you lower the mk4 does it put the tracking, wheel alinement, camber etc out by much?

You will have lower profile tyres on the 18's prob (225/40/18) so the amout you have gained on the rim you will lose on the prifile of the tyre.
The radius will be the same - So it will not put the speedo out 

As for camber etc that will depend on how low you go TBH. Always a good idea to get it all checked after lowering tho

[Chris 'N' Jen]

18's with 225/40/18 tyres shows you go slower by about 1 mph i think.

heres a handy little converter
http://www.dakota-truck.net/TIRECALC/tirecalc.html

type your standard tyre in A and you intended tyre in B and say submit, then click on full analysis.

 

[topher]

tbh the inaccuracy of your speedo probably gives more deviation than the very slight change in rolling radius. Above 30mph mine was constantly 4 - 5 mph out according to gps.

[l4v15]

yea good stuff. thanks.