16" Wheels all round - Offset question
Discussion
Right ok.... 
I know I've posted loads of subjects about wheels and tyres but I have (what I hope to be) the last question.....
Is the offset for the 16" wheels for the later cars that came with 16's all round the same front and rear?
And on the car I own is the offset the same front and back so if I bought 2 rear 16" wheels could I put them straight onto the front of my car? (obviously with the corretly calcultaed tyre size which I think would be 205/50/16 which would give a speedo error of -0.8%)
What I would like to do is replace my front 15" wheels for 16's as this expands the options when it comes to new tyres. I want to get GSD3's for the front to match my rears but they don't come in 15".
I know I've posted loads of subjects about wheels and tyres but I have (what I hope to be) the last question..... Is the offset for the 16" wheels for the later cars that came with 16's all round the same front and rear?
And on the car I own is the offset the same front and back so if I bought 2 rear 16" wheels could I put them straight onto the front of my car? (obviously with the corretly calcultaed tyre size which I think would be 205/50/16 which would give a speedo error of -0.8%)
What I would like to do is replace my front 15" wheels for 16's as this expands the options when it comes to new tyres. I want to get GSD3's for the front to match my rears but they don't come in 15".
I'm in the process of doing exactly the same to mine.
I bought another pair of rear wheels and fitted the wider 245/45 16 SO3s. These went on the rear and then I fitted the original rears to the front. Unfortunately they are too big and rub when manoeuvring over uneven surfaces.
I was thinking of fitting 205/45 16s but haven't got round to it yet. I just put the old 15s back on for now.
Anybody tried either of these sizes?
I bought another pair of rear wheels and fitted the wider 245/45 16 SO3s. These went on the rear and then I fitted the original rears to the front. Unfortunately they are too big and rub when manoeuvring over uneven surfaces.
I was thinking of fitting 205/45 16s but haven't got round to it yet. I just put the old 15s back on for now.
Anybody tried either of these sizes?
else said:
I was thinking of fitting 205/45 16s but haven't got round to it yet.
From the website that I used to calculate tyre sizes the closest would be a 205/50/16 as the difference is --0.8%. So I think it said that when I was doin 60 the true speed would be 60.5. With such a minimal diameter difference and the same width tyre there should be no rubbing of body work.
I stand to be corrected on any of this, hence the post.
The offset is the same so yes you can fit rear rims on to the front. Tyre size for the front is 225/45ZR16. You will also need rack stops which will increase the turning circle to Boeing 747 proportions.
Not too sure where you are coming from with the speedo theory, you lost me on that one.
Not too sure where you are coming from with the speedo theory, you lost me on that one.
Ribol said:
The offset is the same so yes you can fit rear rims on to the front. Tyre size for the front is 225/45ZR16. You will also need rack stops which will increase the turning circle to Boeing 747 proportions.
Not too sure where you are coming from with the speedo theory, you lost me on that one.
There's a website that calculates tyre sizes based on adjusting the tyre width or the wheel diameter.
If you go from a 205/55/15 tyre/wheel combo to a 205/55/16 the overall rolling circumference of the wheel will be incresed as you are putting the same aspect ratio-tyre width on a wheel 1" bigger.
Does that make sense? I think it's 55% of the tyre width on a 15" wheel so you have to adjust down to a 50% aspect ratio to maintain the same circumference.... sounds confusing but probably the way I explain it.
If you don't do this adjustment you will affect the distance travelled for each rotation of the wheel which I believe affects the acuracy of the speedo.
I was going to fit 205/50/16 tyres as from the said calculator the accuracy is only a little bit affected and there should be no body contact as the width of the tyre is exactly the same.
. Ribol said:
Err.. Speed calculation is related to the Rear wheel diameter, not the front 
In his defense some cars(very few) work off the front wheels, not the back.
Sadly a TVR ain't one of them
er actually speedo sensed at the prop (early cars) or drive shaft (later). I accept this is connected to the rear wheel so M@H is factually correct.
the dodger said:
M@H said:
Err.. Speed calculation is related to the Rear wheel diameter, not the front
In his defense some cars(very few) work off the front wheels, not the back.
Sadly a TVR ain't one of them
er actually speedo sensed at the prop (early cars) or drive shaft (later). I accept this is connected to the rear wheel so M@H is factually correct.
Really, you learn something new every day
else said:
Unfortunately SO3s aren't available in 205/50ZR16 but 205/45ZR16 are so that's what i think I will go for. A bit narrow for a 7.5" rim though.
>> Edited by else on Tuesday 5th April 16:43
The original fronts are 7.5x15.... According to an artical I read that Jools helped on.
GSD3's (the prefered choice of the factory these day
) are available in 205/50/16.... checked today. They will match my new rear tyres.Mine are ET42(F) & ET33(R) IIRC. Only Cerbs have same front & rear as standard I think (ET35 on my set of 16"). I believe my 18" spiders are same offset as the 16".
Cerb ET35 has hardly any clearance on my rears - I wouldnt risk using them, just got a good set of tyres spare.
I think the original offsets should be ET25 (F) & ET 42 (R), peugot & ford or something.
Dave
Cerb ET35 has hardly any clearance on my rears - I wouldnt risk using them, just got a good set of tyres spare.
I think the original offsets should be ET25 (F) & ET 42 (R), peugot & ford or something.
Dave
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