M series offset / et ?
M series offset / et ?
Author
Discussion

MischaVisserv8

Original Poster:

161 posts

225 months

Saturday 15th January 2011
quotequote all
good afternoon to you all,

can anybody help me with this matter?
i'm planning to upgrade my wheels to 15 inch but i don't know the ET / offset?

yr help would be highly appreciated!

many thanks for yr help in advance

brgds

jan visser

djc100

490 posts

263 months

Monday 17th January 2011
quotequote all
I am not a wheel expert but my car is fitted with 15x6 ET7 Minilites.

Fitted by the previous owner but I am told these are 'standard' spec. for M's.

However with more than 0.5 deg neg camber, on full lock the rim touches the upper wishbone. (the edge near the camber adjuster)

Options are to grind the wishbone edges or fit 3-5mm spacers or both.

Spacers bring their own problems, in my case, too few threads in the wheel nut - so longer wheel studs anybody.

If I was buying new wheels I would look for zero off/inset.

David

Astacus

3,654 posts

251 months

Monday 17th January 2011
quotequote all
I think that, at least for Vixens, the wheels recommended by several people on this forum, are 5.5J 15s. I don't know whether this is the same for the M Series. It sounds like these should have slightly more clearence.

I suspect others, with a more definitive answer, will be along soon. smile

I am torn between Minilites and Wires for my S1

DavidY

4,489 posts

301 months

Monday 17th January 2011
quotequote all
Ms as standard were 6J x 14, most people with 15" wheels ran 7Jx15 with 205/60s or 205/55s(I had a 19mm spacer on the front with long bolts). On the rear you can go wider, I ran 9Jx15, but you need to be careful with tyres to keep the shoulder in the wheel arch, though you can rub back the fibreglass on the inner lip to give more clearance. The 3000S has more clearance then an M/Taimar

JR

13,164 posts

275 months

Tuesday 18th January 2011
quotequote all
I've rtied to find my notes on this but couldn't. IIRC standard offset is 2mm all round. This is fine for the standard whleel and for a 6.5" rim. A 7" rim will require a -3mm offset to avoid touching the wishbones at the front. Any more than 7" and you'll need to check the individual car carefully. Due to the lack of availability of wheels with about zero offset most people have them made by Compomotive or Image and go for 16"x7" and fit 205/55/16 tyres which are cheap with a very good selection to choose from.

Christian3000s

36 posts

184 months

Thursday 20th January 2011
quotequote all
DavidY said:
Ms as standard were 6J x 14, most people with 15" wheels ran 7Jx15 with 205/60s or 205/55s(I had a 19mm spacer on the front with long bolts). On the rear you can go wider, I ran 9Jx15, but you need to be careful with tyres to keep the shoulder in the wheel arch, though you can rub back the fibreglass on the inner lip to give more clearance. The 3000S has more clearance then an M/Taimar
David, didn't knew about that bigger clearance on the 3000s (which is my car). Mine is fitted with the standard 6x14 T slots with 185x70x14 Good Years, what size would you recommend for new tyres? Would it be stupid to fit larger/lower profile tyres?

thanks,

Christian

DavidY

4,489 posts

301 months

Thursday 20th January 2011
quotequote all
If you are running 6J wheels I would stay with 185 or go to 195's (like the turbo cars). If you are changing your wheels than that is a different matter!

Edited by DavidY on Thursday 20th January 16:59

jellison

12,803 posts

294 months

Friday 21st January 2011
quotequote all
Anyone know what offet the 7Jx15 have to be to clear the standard front arches (or do they have to be modded a tad). Eric Stahler is trying to work this out for his 3000M Race project. i.e. can he get 7j's under there as they are better platform for the 205x15x60 yoko's.

205's are fine on a 6J (raced these for many years no probs but as above that tyre is best on a 7j), best tyre for a 6 is a 195 for the road, but racing 205.

JR

13,164 posts

275 months

Friday 21st January 2011
quotequote all
jellison said:
Anyone know what offet the 7Jx15 have to be to clear the standard front arches (or do they have to be modded a tad). Eric Stahler is trying to work this out for his 3000M Race project. i.e. can he get 7j's under there as they are better platform for the 205x15x60 yoko's.

205's are fine on a 6J (raced these for many years no probs but as above that tyre is best on a 7j), best tyre for a 6 is a 195 for the road, but racing 205.
About -3ET +/-2mm

( Have you seen this thread? http://www.pistonheads.com/gassing/topic.asp?h=0&a... )

jellison

12,803 posts

294 months

Friday 21st January 2011
quotequote all
JR said:
jellison said:
Anyone know what offet the 7Jx15 have to be to clear the standard front arches (or do they have to be modded a tad). Eric Stahler is trying to work this out for his 3000M Race project. i.e. can he get 7j's under there as they are better platform for the 205x15x60 yoko's.

205's are fine on a 6J (raced these for many years no probs but as above that tyre is best on a 7j), best tyre for a 6 is a 195 for the road, but racing 205.
About -3ET +/-2mm

( Have you seen this thread? http://www.pistonheads.com/gassing/topic.asp?h=0&a... )
Cool - forwarded to Eric.

pumpkin

156 posts

258 months

Friday 21st January 2011
quotequote all
Try this old thread. I posted just after I had measured the offset on my T-slots
http://www.pistonheads.com/gassing/topic.asp?t=156...

GAjon

3,929 posts

230 months

Friday 21st January 2011
quotequote all
This may be of some use?

These are the dimensions of my front and rear wheels, but, my car has the SE arches added to accommodate the tyres, which needs to be taken into consideration



PS these sizes were a direct crib of David Geralds 3000S race car from the 80's.
John

jellison

12,803 posts

294 months

Tuesday 25th January 2011
quotequote all
Hi Jon - are the SE Arches for front and rear or just rear?

I have bought a spare 7J ML for EricS to try.

DavidY

4,489 posts

301 months

Tuesday 25th January 2011
quotequote all
I ran a 15" 9J on a Taimar with standard arches (with 7Js up front). the 9J had zero offset and was fitted with a 225/50 tyre. It only just kissed the wheel arch on full suspension travel. a &J on the rear should be no problem.

See top image


jellison

12,803 posts

294 months

Tuesday 25th January 2011
quotequote all
Top stuff David, that should help Eric. He'll have my 7J this week.

(9J fits (well just from the pick - sticking out a bit)). Amazing. Over tyred!?

Same colour scheme as my 3000M I had back in the Day (over 20 years back).

DavidY

4,489 posts

301 months

Tuesday 25th January 2011
quotequote all
Was the smallest width tyre I could get on the rim. Yes it was a bit proud of the wheel arch (never caused an issue with an MSA scuiteneer though), overtyred yes for the road but not for trackdays plus hillclimbing/sprinting.

My car was burgendy yours was brown I believe, both quite nasty 70's colours!

GAjon

3,929 posts

230 months

Tuesday 25th January 2011
quotequote all
jellison said:
Hi Jon - are the SE Arches for front and rear or just rear?

I have bought a spare 7J ML for EricS to try.
SE front & rear, I have had 235's on the back without any problems.
Hi Dave not hankering for an M again are you?

DavidY

4,489 posts

301 months

Tuesday 25th January 2011
quotequote all
Always hankering, but I've got so much on at present, it would be one project too far! (have built a new workshop though!)

jellison

12,803 posts

294 months

Tuesday 25th January 2011
quotequote all
DavidY said:
Was the smallest width tyre I could get on the rim. Yes it was a bit proud of the wheel arch (never caused an issue with an MSA scuiteneer though), overtyred yes for the road but not for trackdays plus hillclimbing/sprinting.

My car was burgendy yours was brown I believe, both quite nasty 70's colours!
That looks Chocolate Brown! Must be the light! (Look the same as mine smile). You must have had a good bit more grip that grunt with those tyres/boots (unless very hotted up lump).

DavidY

4,489 posts

301 months

Tuesday 25th January 2011
quotequote all
Engine was around 200bhp, could go through Cramer Curves without lifting at over 100mph (real speed not speedo!)