Help Me Work Out Offset

[No Crust Racing]

Hey guys,

The car in question is a 4 stud S13 but trying to get good info out of Nissan Silvia is too much of a f#$k around, I know that the people on here are more informed, easier to deal with and I'm still a skyline man at heart

I've got S15 calipers up front which BARELY clear the current rims which came on the car and are some cheap nasty 17x7" 5 spoke things with a +40 offset.

Now if my understanding of this whole setup is right then a I could go +30 or +35 on the next set of rims and that would give me some more caliper clearance (I think rim "disc" is also an issue?)

I'll be running up to -3/-4 degrees camber on the fronts and not more than say around -2 on the rears.

Currently the tyres are craptastic 215 fang wung chung no name things but I'll be grabbing some 235 wide advan semis before DECA in August.

I'm hoping to not need to roll the guard either so rim width could be an issue when combined with camber.

Help me get my head around it and buy the right rims.

Cheers

Edited July 21, 2009 by ActionDan

[nisskid]

I know that the people on here are more informed

:ninja:

the reason why u might not being getting a decent response is ur simply not giving enough info.

a few things:

caliper clearance isnt determined by offset, it's determined by disk type, a completely different measurement

you havnt specified wheel specs besides offset

ur not gonna get much under without rolling the guards

what height will the car be running?

[No Crust Racing]

:D

the reason why u might not being getting a decent response is ur simply not giving enough info.

a few things:

caliper clearance isnt determined by offset, it's determined by disk type, a completely different measurement

you havnt specified wheel specs besides offset

ur not gonna get much under without rolling the guards

what height will the car be running?

Hey Niss, what I meant by that is that I wasn't going to even bother asking at NS because it's generally a waste of time. I'd have gotten your first line from 6 different people but nothing saying what extra info I needed then 4 people telling me that I should just go 5 stud conversion lol

Now, I think I covered wheel specs with the exception of disk type, I gave rim width, diameter and offset so that's a start lol

Is this disk type measurement listed on the back of the rim and if so what form does it come in and I'll grab it off the car. (If I remember it was something like O, R, and A) Thoguh I can't remember which letter was what clearance etc.

I was under the impression I'd seen a few Sil's running 8 and 9" rims without guard rolling but it seems to be a case by case basis, no doubt affected by disc type which no-one talks about.

I'll try and find out current disc type and will measure front and rear ride height and go from there.

Cheers

[nisskid]

haha true, ns will just tell u to stretch a tyre up against the guard, and when u say u dont want to they'll call u a pussy lol

when u say u covered the diametre and width, are u talking about the 17x7's? i thought they were ur old rims and u were looking for something new completely different?

maybe im still missing something lol

as far as width, u can go a 8" and 9" fairly easy on the S13, but it depends on what tyres u wanna go. rear u can get away with something like a 17x9 +38 with a 245 or 255 depending on camber and suspension. front is a little bit more difficult as there's clearance issues with coilovers, and each coilover is different to how much clearance there is. how much clearance is there now with the 17x7 +40's? i can go from there as to reccomending an offset for the fronts.

and with the disk type, yep ur on the right track, it's not an easy spec to get, but u need to to be certain about clearance.

[No Crust Racing]

Yep you're right I did give old details, woops...

I'm happy with whatever rim width will be enough for the 235 semis i'll be getting.

I'll take a measurement on the car as to how much clearance there is between the rim and the coilover.

I'll see if I can get a disk measurement on the rims that are on it but I'd hazard a guess and say whatever is the worst one to have as these are very cheap nasty rims with crap offsets.

I'll get back to ya with some more info.

[nisskid]

235 all round?

[_Ryan_]

http://marksink.com/tire_wheel_offset/offset.html

[No Crust Racing]

235 all round?

Yep, didn't get a chance to grab measurements last night. Will have a look on the weekend as I'm in the process of moving.

http://marksink.com/tire_wheel_offset/offset.html

Awesome Just need to know caliper clearance now.

[badhairdave]

if you are going with 235 semis all round then it's worth getting the same width rim all round for rotation, preferably an 8.5 or 9 inch width.

The previous owner of my s13 ran 235's all round on 17x8.5 +30's with stock guards. The car sits at stock height.

I currently run 235/45 r888's on 17x9+25's all round. The rear was fine (but i gave them a lip anyway) the front needed a bit of guard work initially but once i added in more front camber i reckon it would be a pretty close thing with stock guards.

4 stud makes it hard. You can pretty much grab any 30 odd offset in a 5 stud jap rim and it will clear the calipers.

In the pic the fronts have s14 lower control arms and i've added a 5mm spacer on the front wheels to give more clearance to the strut for when the tyre flexes. So the front is effectively a 17x9 +20. The guards are pulled out as far as i could get them with a roller.

[No Crust Racing]

I'm looking at some Enkei's which are 17x8 with a +34 offset. Now an offset calculator tells me i will have 7mm less clearance to the strut and that the rim edge will extend a further 19mm that 'should' be ok.

What I can't get from the seller is disk type so i'm unsure if they will clear the calipers and i can't really drive the silvia 3hrs each way to test fit them.

Also, wider tyres will also mean less clearance from rim/tyre edge to strut body and LCA's, which i think i have already rubber a few times but only at the drifts.

Thoughts?

[Hank Scorpio]

17x8 +34 Enkei's are made to clear brakes on cars like Silvias. Unfortunately you can't measure the "x-factor" of a wheel (the clearance between the spokes and brakes) but you should be ok.

[phunky_monkey]

What type of Enkei's are they? Dished or no dish? Seems like a good size, with worst case being a small slip on spacer but you should be fine as the stock calipers are quite a bit thinner than S14/15 calipers from memory.

[No Crust Racing]

pics oft he actual rims fitted to the car they are currently on

[phunky_monkey]

I'd say you should be fine with those, can you not try them out?

[No Crust Racing]

I'm 3hrs away and while the Sil is road reg'd it's not the best car to be doing trips to melb in.

I was planning on rolling down in the BA and picking them up.

I don't mind having to lip the guards ever so slightly but I'm more interested in caliper clearance and the possible contact with the LCA as I already have some marks on mine with the current rim/tyre combo but that was from the drifts which these rims would not be doing (as they will have my semi's on them)

[nisskid]

LCA clearance? :S

get the guy to measure the caliper clearance, basically u put a solid flat object or soemthing against the mounting surface, then measure the distance to the spokes.

however going by the pics id say they have plenty of clearance.

[No Crust Racing]

LCA = lower control arm, I've already got some marks on mine from the drift day, but as I mentioned shouldn't be a huge issue for circuit.

Yeah I'm awaiting clearance measurements.

[nisskid]

yeh i know, im just trying to think how ur wheel is fouling on ur LCA :S

sure it's not ur knuckle making the marks?

[No Crust Racing]

Yeah I had the picture of what I had seen with rub marks on it wrong in my head.

I've attached a pic which shows the inner guard/chassis rail is what got rubbed, I have that on both sides.

Also, my ride height is about 350mm rear and 345mm front (measured from rim centre to guard lip)

My clearance from the tyre to the shock is roughly 70-55mm (hard to see without getting right in there and I'm already dressed for work)

[nisskid]

yeh that's ur chassis rails, more negative offset and lower profile are the most effective ways to stop that, also thinner tyre/wheel will help as well.