Yet Another Wheel topic.

[Random24234]

On the way over to dropping off the Cerb for her service (bumped into Fubar while he was just picking his up). I figured i'd have the wheels balanced at a tyre specialist I trust and have used over the years, so 30 pounds and twenty minutes later a lad with a serious expression appeared to inform me one of the front wheels is buckled to a significant degree. Both rears are slightly buckled but not significantly.

My main problem is they are currently TSW Thruxtons that are no longer made, so its a case of a new set i figure.

I quite like not having standard wheels, but would like to make sure i have all the right information so i can figure out what the heck to replace them with.

Scanning the forums there seems to be debate on the details so is this correct?

PCD 114.3x5
Bore 72.1mm
Offset Front is 42 (18x8)
Offset Rear is 33 (18x9)

As these offsets are quite tricky to obtain is there any real downside to using spacers? Also suggestions for wheels are welcome.

[chris willy]

18" Spider Wheels are all 18X8,5" front ET42 and rear ET33.

The Cerberas produced from the end of 2002 use the front wheels also on the rear axle... so ET42 all round.

HTH
cw

[Gazzab]

Cerberas post the rl7's only used Tuscan fronts all round. One or two cerbs have rears on the rear but I doubt many or any came from the factory like that.

[Random24234]

That is interesting, currently the tsw i have on are 18x9.5 on the rears and i think 18x8 on the front.

I assumed the spiders were staggered fitments is this not the case then? Also what is the thinking in fitting a larger wheel to the same size Tyre.

Edited by Random24234 on Sunday 12th May 19:36

[esso]

Offset is a debateable issue,i have aftermarket wheels on mine,the fronts are 18X7J with 35 offset fitted with 215/35 tyres,i did have 225 on these rims but they were too wide and it distorted the sidewall.The rears are 18x9J 40 offset with 255/35 tyres.It can drive you mad reading these wheel forums and looking on wheel suppliers websites as you will never find a definative answer.

[Jhonno]

17" RL7's are 17"x8" et35..

[Steve_T]

I'd have to check but I believe the RL7s say ET41 on them. Also be careful that you have enough thread on the studs engaged by the wheel nuts if you use spacers.

[sonnylad]

Worth checking with TSW wheels as when they were in Luton/Dunstable they had a cnc machine to machine up the ofsets and pcds on blanks.

Would be surprised if they no longer owned that bit of kit.

[aide]

chris willy said:

18" Spider Wheels are all 18X8,5" front ET42 and rear ET33.

The Cerberas produced from the end of 2002 use the front wheels also on the rear axle... so ET42 all round.

HTH
cw

I have ET33 on the rear and ET42 on the front.

And have two spare ET42 fronts.

I put a serious dent in one of my rears a couple of weeks ago.

Question: can I put the spare fronts I have on the back of the car? Or do I need spacers?

[Alistair H.]

You really should have fronts all round. So yes is the answer and no to spacers. I used to have fronts and rears and always suffered with the tyre hitting the arch. Not any more with all fronts.

aide said:

I have ET33 on the rear and ET42 on the front.

And have two spare ET42 fronts.

I put a serious dent in one of my rears a couple of weeks ago.

Question: can I put the spare fronts I have on the back of the car? Or do I need spacers?

[aide]

Thanks Alistair, much appreciated.

Does anyone know what ETxx means? I sort of guessed it's an offset, is it in mm?

[Alistair H.]

aide said:

Thanks Alistair, much appreciated.

Does anyone know what ETxx means? I sort of guessed it's an offset, is it in mm?

Yes indeedy. Have a read of this.

http://www.worldoneperformance.com/blog/2009/07/22...

[flyingdutchie]

Einpres Tiefe

[aide]

Perfect.
And what a difference 9mm makes!
Thanks for the info, that's crystal clear now.

[Warwick67]

aide said:

Does anyone know what ETxx means? I sort of guessed it's an offset, is it in mm?

This is quite a good resource too......

http://www.carbibles.com/tyre_bible_pg4.html

[aide]

Warwick67 said:

This is quite a good resource too......

http://www.carbibles.com/tyre_bible_pg4.html

The little offset calculator really nails it.

[Gazzab]

aide said:

chris willy said:

18" Spider Wheels are all 18X8,5" front ET42 and rear ET33.

The Cerberas produced from the end of 2002 use the front wheels also on the rear axle... so ET42 all round.

HTH
cw

I have ET33 on the rear and ET42 on the front.

And have two spare ET42 fronts.

I put a serious dent in one of my rears a couple of weeks ago.

Question: can I put the spare fronts I have on the back of the car? Or do I need spacers?

Your may have to take a hacksaw to hubs to get centre caps back on.

[Mr Cerbera]

Gazzab said:

Cerberas post the rl7's only used Tuscan fronts all round. One or two cerbs have rears on the rear but I doubt many or any came from the factory like that.

Sept 2001 4.5 Spiders:-
Front8.5 x 18 et42
Rear 8.5 x 18 et33

Making hard and fast statements about TVR construction can be a dangerous habit.

[FUBAR]

aide said:

And what a difference 9mm makes!

So my ex tells me

[Jhonno]

FUBAR said:

aide said:

And what a difference 9mm makes!

So my ex tells me