Boxster wheel fitment Options

[technicalninja]

Trying to wrap my head around what size spacers (range) I should be looking for to utilize stock 99 Boxster wheels on a "standard" flared 914.

Fronts are 17X7 ET 55
Rears are 17X8.5 ET 50

Any suggestions?

[technicalninja]

Trying to wrap my head around what size spacers (range) I should be looking for to utilize stock 99 Boxster wheels on a "standard" flared 914.

Fronts are 17X7 ET 55
Rears are 17X8.5 ET 50

Any suggestions?

First, what size tires?

Second, as already asked, what do you mean by "standard"? Is that a stock narrow body or steel GT flares?

Third, assuming you are talking GT flares is how flush do you want the wheels with the fenders?

Depending on tire width you are going to need minimum a 20mm spacer in the front for the 7s to clear the front struts. 8.5s most likely are not going to fit a narrow body rear, assuming you are talking GT flares than 33mm minimum to clear the inside. These are both the MINIMUM you need to clear the inside assuming your tire size is not wider than the rim. If you are running GT flares then you may want to make these larger to fill the fenders. Exactly how much larger depends on the look you want, the tire you are running, and the measurements of your specific car.

1st question the "daily" tires that are mounted on the Boxster now are Michelin Sport AS in 205/50-17 front and 255/40-17 rear. These tires are brand new.

2nd question: steel GT flares and as they haven't been installed yet I will have a bit of "wiggle room" during the installation.

3rd question: They don't have to be stupid flush IMO. I'd rather have a bit of extra room for tire/wheel/suspension deflection. I'd like to avoid body damage if possible!

Now, I also have a set of competition Forge Line wheels which I believe were specifically for the Boxster. I really need to get the measurements off of these before I go much further. They are also in 17" diameter, but the fronts look 8+ wide and the rears may be 10". They have destroyed Hoosiers on them now.

JamesM, thank you for posting!
You ARE correct! I am most interested in inside clearance right now. I am planning on running ground control rear coil overs so my springs will be slightly smaller diameter.
911 struts in the front with the Boxster calipers all around.

I am 5 lug already so I don't need 4-5 adaptors.

There is a set of spacers in the classifieds right now which prompted my posting this thread.

http://www.914world.com/bbs2/index.php?showtopic=372031

These are 57mm and appear to be thicker than I will need.

Thanks to everyone for the info!

[JamesM]

1st question the "daily" tires that are mounted on the Boxster now are Michelin Sport AS in 205/50-17 front and 255/40-17 rear. These tires are brand new.

2nd question: steel GT flares and as they haven't been installed yet I will have a bit of "wiggle room" during the installation.

3rd question: They don't have to be stupid flush IMO. I'd rather have a bit of extra room for tire/wheel/suspension deflection. I'd like to avoid body damage if possible!

Now, I also have a set of competition Forge Line wheels which I believe were specifically for the Boxster. I really need to get the measurements off of these before I go much further. They are also in 17" diameter, but the fronts look 8+ wide and the rears may be 10". They have destroyed Hoosiers on them now.

JamesM, thank you for posting!
You ARE correct! I am most interested in inside clearance right now. I am planning on running ground control rear coil overs so my springs will be slightly smaller diameter.
911 struts in the front with the Boxster calipers all around.

I am 5 lug already so I don't need 4-5 adaptors.

There is a set of spacers in the classifieds right now which prompted my posting this thread.

http://www.914world.com/bbs2/index.php?showtopic=372031

These are 57mm and appear to be thicker than I will need.

Thanks to everyone for the info!

The fronts shouldn't be to much of an issue with 205s on a 7" as long as you are offset roughly ~35mm or less(55et-20mm spacer) you should be fine. I run as close to the strut as possible to maintain scrub radius and light steering for autocross but if you are going for looks you may want to space them out another couple of CM. With 205s you have a good deal of room.

255s on the other hand you may want to confirm some measurements. On a 255, depending on the specific tire you are probably going to be 10"+ at the widest point and with steel GT flares, depending on how they were installed, you are probably looking at somewhere in the 10.5-11.5" range roughly between the fender lip and chassis. Off the top of my head I think you are going to want to be in the ~10-15mm total offset range give or take to keep it centered as much as possible, but measure this one as it may be a bit of a squeeze. If you didn't already have the tires I would say drop to a 225 (or maybe even a 245) in the rear as that is more optimized for a 8.5" wheel and gives you slightly more wiggle room. On the plus side you don't have the fenders on yet so these can be manipulated somewhat to be sure you fit the tire.