Criss wrote:i'm running 215/45/17
so i should run 40 psi????
and aza, do you got any scrubbing of 235 tires???
i want to upgrade to 235 as well
remarkable grip ?????
yes you should run @40
and for those size tyres (235) you should have a 8inch rim
@ aza i would run them at 38 to 40 still
reason to run psi higher on the 40/45 profile tyres is because they have a much lower side wall the pressure has to be high otherwise they build up too much heat causing them to `go off or have less grip` other effects incl fast tyre wear and they can actually unseat themselves from the bead causing a deflation and possible damage
aza can run slightly less as the 45 profile is not actually 45mm but 45% of the ratio of width of tyre (a very common misunderstanding)
OH and for 17x7 rim on FTO tyre size should actually be 215/40x17
sorry I just whent out and looked at the psi and its at 38 front and 36 back
and yep I have the 17x 8's rims
as for grip well yep there is a sh*t load of that
do you get any scrubbing of 235 tires??? yes on full lock or 1/2 lock when going up a driveway but most FTO's do that any way.
you just have to get the right off set rims.
Last edited by aza013 on Fri Jul 31, 2009 10:17 pm, edited 1 time in total.
thanks everyone, reali mind opening for me=]
cus i'hv got a 17x7.5 on the front and 17x8 at the back
i decided to put 17X8 in the front now and hving 235 tires
and 225 at the back
do you think it's a good idea???
i would stick with 225/40 front and possibly go 235/40 rear keep the wider rim at rear but why have two different size rims? if you go 235 front your speedo will be wrong
Criss wrote:i done know, i bought from a member here
and just a stupid question, why using 235 will make the speedo all wrong ?
how much will it +/-????
rolling circumference of wheel and tyre will be much larger so eg if your doing 100kph with larger circumference you will be going faster than actually said on speedo as speed sensor in gearbox not at the wheels it would be opposite if your circumference is smaller
Criss wrote:i done know, i bought from a member here
and just a stupid question, why using 235 will make the speedo all wrong ?
how much will it +/-????
rolling circumference of wheel and tyre will be much larger so eg if your doing 100kph with larger circumference you will be going faster than actually said on speedo as speed sensor in gearbox not at the wheels it would be opposite if your circumference is smaller
I have had it tested and my speedo is out by 3-4Ks @100 with the set up I have.