Offset

[spryboy1974]

Not sure if this has been asked recently guys but can anyone tell me what the offset is for standard ph1 19 16v alloys!!??

[The T.I.B.]

yes it has been recently

I think it's 36-37 ish

[james]

38

[spryboy1974]

You absolutely sure about that James??
Trouble is i have fitted big brakes to the front,but in order to get clearance i have had to fit 8mm spacers. Now i have a real bad wheel wobble at 70mph and the local tyre place reckons this is because of the spacers and the fact that the wheels aren't sitting on the centre of the hub.So the wheel nuts are donig the job to centralise the wheels.??
I am looking at getting some different wheels so i can do away with the spacers but need to know the exact offset so that i can get the correct ones!!!

[Gray-16v]

Do a search,

This subject has come up a few times recently and someone posted a link to a sit for PDC and offsets

[srmunden]

Typing 'wheel pcd' into google will bring up several sites with info. Offset can (apparently) be 35 - 42mm, so 8mm on top of 38mm will put you off the edge. I'm no expert in this (or anything!), but I would have thought that offset would only affect cornering dynamics and not straight line running?

[Chris H]

standard offset is 36 mm.

also the wheel nuts always centralise the wheels

[spryboy1974]

I thought the same about the wheel nuts Chris.
Maybe the wheel bolt holes/bolts are a bit worn causing the wheel to be off centre??
I must admit that the tyre place didn't give me much confidence as they didn't know what offset was!!!!

Any other reason why i should have have such a bad wobble? It only does it from 70mph upwards!!

Gearbox/driveshaft maybe,although the gear lever hardly moves.The steering wheel wobbles left to right just a bit but really fast!???????

[Gray-16v]

Sounds like you need your tracking done matey, if the wheel was slightly off centre you'd feel it more at slow speeds, kinda like my old buckled alloy

[hooverphonique]

you could have a bent alloy.. that's been seen often.. and chris is absolutely correct about the offset, it is indeed 36mm...

even though the wheel bolts center the wheel, i find it much easier to work with wheels with the correct PCD, either via an OEM ring inserted into the alloy (OZ use that, for instance), or the plastic centering rings for other alloys with no ring insert...

[Chris H]

tracking has nothing to do with this, tracking relates to the relation of the angle of wheels to the cars longitudinal axis. Nothing to do with vibration, if it causes vibration the the wheels would obvouiously be way out and the car hard to control.

its either balance or a dint, which technically comes under balance

[Skinny'sPh2]

u need the correct spiggot rings (plastic hub rings),60.1 inner diameter, if ur changing wheels u can put between 35-40 and it will be fine most wheels now are comin 38 offset anyway.. i had 35 et wheels on ma ph1 and they sat out just nice to fill the arch and had loads of caliper clearance urs should be ok with the big brakes with a 35et i think if u go lower than 35 et it might catch ur arch. i have 7x18 et40 on jus now with 5mm spacer on back it just catches driver rear over heavy bumps but all the rest r fine.. without the spacer back wheels catch on inside rear only though, fronts r fine as is

[spryboy1974]

Thanks for all the info guys.
There wasn't a problem with the wheels before i fitted the brakes so it must be a balance issue.
Looks as though i will have to go shopping for some wheels then!!

Been made redundant today so this couldn't have come at a worse time!!!

[spryboy1974]

So if the standard wheels are 36 offset and i have 8mm spacers fitted,what offset wheels do i need??

Not sure if you add or take away where this is concerned!!

[srmunden]

I've never done a brake conversion, so I feel I'm talking out of my anus a bit here, but if you had to fit spacers to push your wheels away from the brake calipers and/or discs and now you want push the wheel rims back in to correct the offset, you'll just bring the collision problem back? Tell us what's failing to clear, pref with pics, so we can better understand the issue (if only for future reference!)

Also, check this page out - Car Bibles: Everything you need to know about wheels, tyres and tyre markings.

[spryboy1974]

I want to get some wheels that will allow me to do away with the spacers but still provide me with the clearance i need for the brakes.
Basically without the spacers the inner part of the spokes? are hitting the edge of the 4 pots!
I will try and take some measurements at the weekend to see what the exact clearances are.

[srmunden]

I see, well not really anything to do with the offset then - that has to stay the same to keep the cornering dynamics right. You really need to talk to a professional wheel seller to get the right advice.

If you're really stuck though, have a good look at the info on the web page I posted (it took me several read throughs to get the ist of it), then think about this - you want to move the spokes away from th