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-   -   Help Needed With What Offsets I Can Put On My Boxster (http://986forum.com/forums/boxster-general-discussions/27511-help-needed-what-offsets-i-can-put-my-boxster.html)

d4lan 01-16-2011 02:24 AM

Help Needed With What Offsets I Can Put On My Boxster
HI Everyone,

I am trying to upgrade my wheels on my 2002 boxster, but am very confused with all these offsets going round. I have been offered the following set of wheels but will they fit straight on or do i need spacers and what size spacers.... please help

The wheels i want to fit are turbo twist 2's i think with the offsets and dimentions below:

Fronts: Part number 993 362 134 06 / 7.5J x 18 ET50 offset, fitted with Continental Sportcontact 2 N2 tyres - 225/40 ZR18

Rears: Part number 993 362 140 84 / 10J x 18 ET65 offset, fitted with Continental Sportcontact 2 N2 tyres - 265/35 ZR18

Has anyone already put theses on their Boxster

Many thanks


husker boxster 01-16-2011 04:04 AM

Welcome to the forum.

The fronts will work. Rear offset on a 986 is somewhere between 44-47 depending on the wheel. So you'll need approx a 20mm spacer. That's on the very outer edge of acceptability. And you'd need to purchase lengthed lug bolts.

Help is at your fingertips, my friend. If you search on et65, you'll find plenty of threads on this topic.

d4lan 01-16-2011 04:10 AM

thanks husker..... will a 15mm spacer do the job?

sorry to sound a bit thick but what do you mean by outer edge?

new to all this

jmatta 01-16-2011 05:13 AM

The inside of the wheel will likely rub with just a 15mm spacer. I have 10s on the rear of my Box with et47 and it's quite tight on the inside (you will need to tie back the e-brake cables, or they'll rub).

By "outer edge", he means the limit of acceptability.

d4lan 01-16-2011 07:37 AM

does anyone actually have et65 on the rears....if so what spacers are on...also do they come out of the arch?

Johnny Danger 01-16-2011 12:05 PM


Originally Posted by d4lan
does anyone actually have et65 on the rears....if so what spacers are on...also do they come out of the arch?

A 10 inch wheel with a +65 offset is extremely high for a 986 boxster. Just to put things in perspective, the last three wheel sets that I had on my vehicle had the following fitments : 19x10 +40 , +36 and currently +31 . I've found that the ideal offset for a 10 inch rear wheel for a 986 falls between +40 to 45 . A more aggressive fitment can involve offsets as low as +35 to 40. In addition, if you ever decide to go the route of adjustable coilovers, to start, you are going to need a low offset of around +40 in order to clear the adjustable perch. So, with all of that said, a +65 offset is sub-optimal for your vehicle. And, as Jmatta indicated, you are going to need at least a 20mm spacer

husker boxster 01-16-2011 01:42 PM

What I should have said is a 986 rear should be in the 44-47 range, so if you want to use a 65, you'll need to use a 20mm spacer to get into that range (65-20=45). Using a 15mm spacer wouldn't get you into that range.

Below is an offset calculator. You can use it to determine how a potential wheel will fit on your Box. To determine what you currently have, go check the rear wheel on your Box at the valve stem. It will have the wheel width (the value with the J) and the offset. This is your starting point. Plug in the new wheel dimmenstions and the calculator will tell you how far in or out the new wheel will be. You can then measure and see how well that works.


Do two things before you purchase any wheel: (1) check the offset calculator and (2) search the forum for information - there's tons of it here. Once again, if you search on et65, you'll find many threads about these wheels. You're not the first to ask. 20mm spacers will work but there are compromises that have to be factored into the decision. Some are willing to accept these compromises, some aren't.

DON'T buy anything until you're sure it's right for you. Porsche wheels are expensive and no one likes to make an expensive mistake. Many sellers say their wheels will work on a Boxster, but only if you use very thick spaces. Be a wise consumer.

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