which size of wheels to choose?

W1ggz · Post by **W1ggz** » Sat Aug 23, 2014 10:10 pm

I can't remember what the offset is off the the top of my head and no spacers on there, I'll have a look tomorrow for you

Andreika609 · Post by **Andreika609** » Sat Aug 23, 2014 10:27 pm

W1ggz wrote:I can't remember what the offset is off the the top of my head and no spacers on there, I'll have a look tomorrow for you

thanks i think its a 25 - 20

as mine are the same 8j but 35 only

Post by **RattyMcClelland** » Sat Aug 23, 2014 11:06 pm

Nope those are 35. Same look as mine at that height. More low means more camber to tuck.
Rota boost only do 35 offsets in 17x8 iirc.

alinton · Post by **alinton** » Mon Aug 25, 2014 9:04 pm

I have a related question re tyre sizes.

When I got my car, it erroneously had 225/55 tyres on the OEM 15" rims. I found that on full lock the fronts would foul on the inner wheel arch covers.

You folk with 17" rims, which look great by the way, how do you fare in this regard?

The table below that I built shows that the stock rim/tyre combo presents a tyre wall of 112.75mm and a total wheel diameter of 606.5mm. But those tasty 225/45 R17s I've seen present a tyre wall of 101.25 and a total dia of 634mm. Does that rub?

And how does it affect the gearing? I found mine with the 225/15R55s was noticeably less powerful on low down acceleration - and the speedo was reading too low.

Table:

A.

Post by **RattyMcClelland** » Mon Aug 25, 2014 9:29 pm

People worry about gearing too much. Its makes such little difference it isnt worth worring about. If it fits run 225/45/17. Gearing wont really be out and i havent notice any difference.

225/55/16 will run on the inner arch and its quite bulbus on a 6.5" wheel. Run a 225/45/17 and the tyre will fit better on a 7" or 7.5" wheel.

Also the tyre makes a difference too. Some companies tyres have different sized faces depending on the shoulder.

alinton · Post by **alinton** » Mon Aug 25, 2014 10:10 pm

Well I've added a column that shows percentage difference from the OEM size.

As it shows, using 225/45/17s will yield a 4.6% increase in total size, therefore the speedo will be 4.6% incorrect (reading low) and the gearing will be affected by that percentage, which does mean that your acceleration will be reduced by that much.

That also means if your speedo shows you're doing 70mph, you're actually doing 73mph. *

However if you used 225/17/40s, then there's only a 1% difference, which certainly would be unnoticeable.

This probably all doesn't matter, but worth knowing.

A

* leaving aside the caveat that speedos usually read a few percent higher than correct anyway.

Post by **Vtecmec** » Mon Aug 25, 2014 10:14 pm

Your speedo reads 5-10% over from the factory anyway.

alinton · Post by **alinton** » Mon Aug 25, 2014 10:15 pm

just added my p.s. as you were posting!

Post by **Vtecmec** » Mon Aug 25, 2014 10:15 pm

beat you to it.

Lude Generation

which size of wheels to choose?

Re: which size of wheels to choose?