jjbunn

I have just received some 17" wheels, which I am replacing my Design 90s with.

Fronts: Part Number: 986 362 124 01, offset: 55. Tire size: 205/50ZR17.
Rears: Part Number: 986 362 126 06, offset: 48. Tire size: 255/40ZR17.

With the Design 90s I was using 7mm spacers on the rear, and had 9 turns of the wheel nuts to tight.

With the new wheels, I have only 7 turns of the nut to tight. It's not enough, is it?

I'm not even sure I want the spacers on the rear, as the wheels fill out the wheel well quite nicely without them.

ilko

My rule of thumb has always been to use longer studs if using a 5mm or larger spacer. If the car is being tracked I would get longer studs regardless of spacer size, but again, that's just me.

Marc Shaw

Regardless of how many turns of the nut you have, I'd get an open lug nut and seen how much thread is engaged with it torqued down.

If the nut does not have it's thread fully engaged, I'd put in longer studs (track or no track).
Marc

911URGE

This is a bit interesting as the D90 rims should not have needed any spacers unless they are not the original offset D90's for a 964. Look near your valve stems on the D90's and see if there is a "ET xx" where xx is the offset. 964's should have a 55 front/rear offset (ET 52 front is ok but clearance issues must be checked). I got the info below from a Porsche TSB 4440.

Chris M.

I added spacers (and longer studs) to take my ET55 wheels down to ET49 so those should fit fine without the spacers.

jjbunn

Hi Stephen,

You are right: they didn't need any spacers, but I added some in an attempt to improve the cosmetics. I haven't checked the stamped offsets, but I expect they are the standard.

Best,
Julian

cobalt

I am using 3 mm spacers front and rear with my 17's for street and I am using the 3mm front with 7mm rear spacer for the rears for AX. I am running 275 rears for AX so I need the added distance to prevent rubbing.

IIRC the rule of thumb is 1 and 1/2 times the dia of the stud should be used in the threads, I believe this is 6 turns not sure. I would only do this with the open ended steel nuts. I had longer rear studs installed to use the 7mm spacers.

911URGE

Julian - When are you going to show us pictures of your car with the new rims? Should be a nice transformation.

jjbunn

They do look good But I am without camera, so it will be next week before I can take any shots.

(I have a G pipe arriving on Monday, so what with the new wheels and the new noise it will be like having a new car!)

psychoideas

A nut needs only its bolts diameter to achieve maximum hold.

Porsche studs are 14mm x 1.5mm pitch.

7 rotations @ 1.5mm pitch = 10.5mm

Minimum necessary 14mm

As others have said, Answer = No.

Hope this helps.

Boeing 717

Doesnt Adrians book state that you can go up to 6mm spacers without adding more stud????

JERRY