Hi folks,

 

Just a quickie - to save me removing a wheel and measuring, or digging out spigot rings - can someone please tell me the diameter of the hub centre bore, which the OEM wheel would mount on?

 

I had in my head a smaller measurement of 59.4mm - but I remember reading 66.1mm somewhere too!!

 

Richard

66.1 dude, now hurry up and get them on!

66.1 dude, now hurry up and get them on!

 

Cheers matey.....

 

however there is an issue! Whilst the sizes and offsets should work (8.5x18 et35 front and 9.5x18 et40 rear) the flat spokes mean that the fronts won't quite clear the brakes!! Craig very kindly sent me a pair of 5mm spacers (thanks mate - most appreciated); but I still have concerns that I'll get wheel wobble at high speed, using them.

 

The wheels came with spigots as the centre bore is larger than 66.1; which means they were not, "custom drilled" for a 300zx, as I originally ordered. So do I have an argument for a free replacement, even though they arrived back in May? Or do I suck it in and go with the spacers.... And for just 5mm, should I bother with the longer studs.....??

 

The rears, fortunately, do clear the brakes and (just) the HICAS arm and - although another couple of mm would not go a miss - they will sit nicely in the lowered arches.

 

Decisions decisions....:oops:

What is the diameter of the new wheels centre bore?

What is the diameter of the new wheels centre bore?

 

It's c70+ mm - but they came with spigot rings to reduce the gap to the requisite 66.1mm

Exact diameter please! The spigot ring will not support the wheel with a flat 5mm spacer.

My personal opinion.......

I never use a 5mm "universal" flat spacer with all those funny shape holes in them.

They will warp and lose torque on the wheel nuts as they heat up and cool down.

I run a 10 mm spacer on the front of my slicktop like this..........

https://www.ebay.co.uk/itm/2-x-Eibach-10mm-Hub-Centric-Pro-Wheel-Spacers-5x114-3-PCD-M12x1-25-66mm-CB/142845245045?fits=Car+Make%3ANissan&hash=item21423d7675:g:vakAAOSwmSZbMe7J:rk:1:pf:1&frcectupt=true

This mounts flat and safe on the hub. You then put the spigot ring on it and then the wheel.

10mm spacers all round will make those offsets much more aesthetically pleasing too so it’s the best of both worlds! Out of curiosity, did you read on the website about custom drilling to 66.1mm or were you told verbally?

Exact diameter please! The spigot ring will not support the wheel with a flat 5mm spacer.

 

Hi Andrew,

 

They are tapered from 81mm to 72mm - spigot rings are 72mm.

 

And yes, you have confirmed my thoughts mate!!

 

Richard

My personal opinion.......

I never use a 5mm "universal" flat spacer with all those funny shape holes in them.

They will warp and lose torque on the wheel nuts as they heat up and cool down.

I run a 10 mm spacer on the front of my slicktop like this..........

https://www.ebay.co.uk/itm/2-x-Eibach-10mm-Hub-Centric-Pro-Wheel-Spacers-5x114-3-PCD-M12x1-25-66mm-CB/142845245045?fits=Car+Make%3ANissan&hash=item21423d7675:g:vakAAOSwmSZbMe7J:rk:1:pf:1&frcectupt=true

This mounts flat and safe on the hub. You then put the spigot ring on it and then the wheel.

 

Thanks Pete - just like Andrew, you have confirmed what I was thinking.....!

10mm spacers all round will make those offsets much more aesthetically pleasing too so it’s the best of both worlds! Out of curiosity, did you read on the website about custom drilling to 66.1mm or were you told verbally?

 

I had the conversation about custom drilling - and then confirmed in writing the offsets, PCD and "custom-drilled for a Nissan 300zx." I didn't mention the 66.1mm centre bore specifically - however one would think that a professional wheel supplier would have a duty to check these things and revert back to the customer, if they did not know!!

 

I don't think that bolt-on spacers are an easy option though. The wheel mounting face does not have recesses drilled into it, to accommodate the spacer retaining nuts!

I’d say, as a technicality, that they are in fact drilled to a 300zx fitment of 5x114.3 and they would argue that the centre bore is machined (not drilled). This is very common with all aftermarket wheels unless they were specifically designed for that model. Most companies will supply them with spigot rings to fill the gap which then makes them specific to that car, I wouldn’t worry about it or bother to argue it personally.

 

Your options with the spacers would be to use either slimline nuts on the studs (which will then need to be cut below flush in the spacer) and then bolt the wheel on; or you can get 10mm hubcentric spacer that aren’t bolt on, you would then just install longer studs on the hubs to facilitate the extra length.

I’d say, as a technicality, that they are in fact drilled to a 300zx fitment of 5x114.3 and they would argue that the centre bore is machined (not drilled). This is very common with all aftermarket wheels unless they were specifically designed for that model. Most companies will supply them with spigot rings to fill the gap which then makes them specific to that car, I wouldn’t worry about it or bother to argue it personally.

 

Your options with the spacers would be to use either slimline nuts on the studs (which will then need to be cut below flush in the spacer) and then bolt the wheel on; or you can get 10mm hubcentric spacer that aren’t bolt on, you would then just install longer studs on the hubs to facilitate the extra length.

 

Yup - you're probably right JP. I am just a little pissed that I didn't get my car back in the spring; and would have been able to sort without issue at the time. But no, I had to go and order the wheels; which have been sitting in my hallway since May...:lol:

 

I'll just to order up some non-bolt-on hub-centric spacers. I'll call the wheel supplier though, they may be kind enough to help out:wink:

 

Cheers folks:clover:

order up some non-bolt-on hub-centric spacers. I'll call the wheel supplier though, they may be kind enough to help out:wink:

 

Cheers folks:clover:

 

Why not order some bolt-on HUB centric spacers. Much safer.

 

I had 25mm bolton hub centric spacers for my stock 16"Zed wheels. No problems and the stock wheels looked flush.

 

Just go with the thinnest bolt on hub centric, probably 10mm.

Why not order some bolt-on HUB centric spacers. Much safer.

 

I had 25mm bolton hub centric spacers for my stock 16"Zed wheels. No problems and the stock wheels looked flush.

 

Just go with the thinnest bolt on hub centric, probably 10mm.

 

Because he’d have to cut the end of the OEM studs with a 10mm spacer as the studs would protrude too far into the wheel mating face. Here’s a random google pic to illustrate, they have also kindly marked the pic showing the protrusion.

 

 

He would also have to faff about finding nuts that were slimmer than 10mm (which would be questionable on the amount of threads to grip). He’s on about using hub-centric spacers that don’t bolt on so there is no compromise on safety, it just requires longer studs and in this case is most certainly the way to go. The Eibach kit that Pete has linked above is what you want Richard, great quality those (just check it comes with 10 studs and not 8 as pictured!).

Edited January 21, 20196 yr by Joely P

Because he’d have to cut the end of the OEM studs with a 10mm spacer as the studs would protrude too far into the wheel mating face. Here’s a random google pic to illustrate, they have also kindly marked the pic showing the protrusion.

 

 

He would also have to faff about finding nuts that were slimmer than 10mm (which would be questionable on the amount of threads to grip).

 

As a rule of thumb the length of thread engagement in a steel nut should be equal to or greater than one full diameter of the bolt and

be of comparable strength. In this case the studs are 12mm in diameter, the thread engagement needs to be a minimum of 12mm.

Thanks for the subsequent replies folks.....

 

…..And JP and Andrew are dead right; I don't want to faff about with bolt-ons, new studs etc... I have been busy during recent days, so haven't had the chance to call the wheel supplier. But I have decided the first option is to try and do a deal on a replacement pair of front wheels, with a 30mm off-set, so I won't need spacers:wink:

Can they weld something equivalent to a spacer on the front wheels and rebore and balance them so you don't need longer studs?

Thanks for the subsequent replies folks.....

 

…..And JP and Andrew are dead right; I don't want to faff about with bolt-ons, new studs etc... I have been busy during recent days, so haven't had the chance to call the wheel supplier. But I have decided the first option is to try and do a deal on a replacement pair of front wheels, with a 30mm off-set, so I won't need spacers:wink:

 

Do they do a 20-25mm offset for the 8.5 up front? And a 35mm for the 9.5 rears?

Can they weld something equivalent to a spacer on the front wheels and rebore and balance them so you don't need longer studs?

 

Anything's possible; but that would still necessitate longer studs in order to secure the wheel nuts properly as the wheel itself would be thicker and the nuts would have less thread to secure to...… Not to mention the cost of these mods - which is probably not far off me having to buy new wheels...:wink:

 

Do they do a 20-25mm offset for the 8.5 up front? And a 35mm for the 9.5 rears?

 

Yes JP; I can specify the offset and they'll make them. 35mm rears will certainly sit nicely within the arches - I think my current 9.5x18s are 35mm - but would 20mm (or even 25mm) offset on the fronts sit out a little too close to the outer edge of the arch? I think my current wheels are 32mm - they sit just inside and no rubbing occurs. I don't want to have the arches rolled - just want to pop the new wheels on with no spacers, messing around etc...!