Rota RB 15x7 +4 wheels on Taimar?

[okinchi]

Hi guys,
I have currently have Wolfrace slot mag (14/7/ 0.31 offset – about 8 mm ) wheels on the ’78 Taimar.
They are looking great and as it seems are quite rare now.
See them here:
http://www.pistonheads.com/gassing/topic.asp?h=0&a...

I am interested in change though and looking at 15x7 Rota RB :
http://www.ebay.com/sch/i.html?_odkw=rota+rb+4x114...

with 205x65 or 60 tires.

However- they have 4mm offset – how will this affect the car geometry?, stress on bearings?

Does anyone have those? - any advice?
Thanks
Marek

[TA14]

Since standard offset is close to zero ( -2mm IIRC ) your new coice of wheel would improve things.

[okinchi]

TA14 said:

Since standard offset is close to zero ( -2mm IIRC ) your new coice of wheel would improve things.

Thanks for responding.
Hmm. Sounds.. right to me to. Would push the wheel 4 to 'outside' - if i am correct.
In the past I used spacers - about 6mm - and it worked (i have not asked the questions of geometry and ...etc. at that time). Perhaps this would all work.
Does anyone tried this before?
TA14 - R U driving TVR?
Thanks.

[TA14]

No, I'm not driving a TVR at the moment but have helped in the wheel set up on quite a few. For the M series a swith to 16" x 7 is quite common. There's plenty of room in the wheel arch but the cars are sensitive to offset in that if you get it wrong (too much +ET) the wheel can hit the wishbones.

[okinchi]

okinchi said:

Thanks for responding.
Hmm. Sounds.. right to me to. Would push the wheel 4 to 'outside' - if i am correct.
In the past I used spacers - about 6mm - and it worked (i have not asked the questions of geometry and ...etc. at that time). Perhaps this would all work.
Does anyone tried this before?
TA14 - R U driving TVR?
Thanks.

Sorry - long time. But I still will do it, however in my case it is 15x7 (not 16x7), are the 15 inch OK too?
I will be selling the Wolfrace 14x7 in OK shape, with new 205x70 tires on it, Any takers?
I am driving it now in Chicago - what a joy!


See picture.
OKinChi

[TA14]

okinchi said:

Sorry - long time. But I still will do it, however in my case it is 15x7 (not 16x7), are the 15 inch OK too?
I will be selling the Wolfrace 14x7 in OK shape, with new 205x70 tires on it, Any takers?
I am driving it now in Chicago - what a joy!

The advantage of using 16" wheels is that you can fit 205/55/16 tyres which are the most common tyre size here - very good choice of rubber in terms of cost, availability and specification - even though they are 3.5% undersize, I've never heard of any problems though.
On 15" wheels you'd be looking for 195/70/15 (factory turbo spec on 14") or 205/65/15 tyres; what is it like there in terms of cost, availability and specification?
I'd also think twice before binning the original wheels.
Car looks good already.

Edited by TA14 on Thursday 11th July 22:24

[okinchi]

Thanks TA14!
I use this site to compare the wheels:
http://www.mintylamb.co.uk/?page=tyre.htm

As original I used : 185/70 x 14 x 7
and compared to
1) 205/55 x 15x7 - this combination results in almost the same dia overall.
2) 205/50 x 16x7 - this makes the dia almost identical

65 profile makes the wheel a bit bigger - it does not matter to me as long it fits.

50 and 55 - profile may look too modern... hmmm.
Marek

[TA14]

okinchi said:

Thanks TA14! ... As original I used : 185/70 x 14 x 7

Original was 185/80or82/14 i.e. full profile (yes I know its odd that there no 81 and you'd think that 100 was full profile)

As a footnote the Turbo cars ran with a smaller dia than ideal and people have used 205/60/15 which is very small but they've not had problems bar ground clearance, speedo and reduction of speeds in gears.