is this the base wheel or the optional high strength wheel?

 

I think these are for the 400. Per GRP website the GT (and 430) stock sizes are:

Front: 19x8.5" Offset +55 Recommend tire size: 245/35r19
Rear: 20x10.5" Offset +60 Recommend tire size: 295/30r20
5X114.3 Lug Spacing, 68.1mm Hub Bore

Edit: I was told the GRP site had typos so OP's post is correct.

 

I think these are for the 400. Per GRP website the GT (and 430) stock sizes are:

Front: 19x8.5" Offset +55 Recommend tire size: 245/35r19
Rear: 20x10.5" Offset +60 Recommend tire size: 295/30r20
5X114.3 Lug Spacing, 68.1mm Hub Bore

GRP admitted that this info has two typos - OEM stock for GT should be Front 19x8 and rear offset 69. They actually have it correct on another page. The OP has it right.

 

Which ones did you pick? What did they cost?

 

I picked a custom set so like the Vossen S17-06 in bronze. Cost was really good! Vossens usually cost $2400 apiece. These run $2300 shipped for the set. They look like this.

What did u get?

 

Nice! Classic and cool…Already ordered?

I worked with John from BSPK; we took his Teresa and modified it…they will have brushed dark gunmetal faces with brushed natural aluminum rims and center caps.

I was a PITA on details, but John was pretty patient and very collaborative. I like that his designs don’t overdo lightness - his/my priority is strength. He does the design and analysis work himself, and is happy to discuss the details.

I’d suggest hitting him up if you hadn’t already spent the $. But yours are pretty hot…😜

 

Nice! Classic and cool…Already ordered?

I worked with John from BSPK; we took his Teresa and modified it…they will have brushed dark gunmetal faces and brushed natural aluminum rims and center caps.

I was a PITA on details, but John was as pretty patient and very collaborative.

I did order them but have to change the spec so I emailed them the new specs. I am going to go wtih:

Front: 19H2x8.0J ET55
Rear: 20H2x10.5J ET69
Hub Bore 68.1mm (give that little 0.4mm tolerance 😂)
I'll have them do the bolt holes too with a 60 degree taper.

I just checked out BSPK and dang their designs are sweet!

Your wheels look Nice! How much did those run you?

 

What did you get?

Why did you choose to go with narrower rear wheels?

Tad lighter with a slightly more aggressive offset while still working with my 295s. We'll see how things fit once they arrive.🤞

 

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Tad lighter with a slightly more aggressive offset while still working with my 295s. We'll see how things fit once they arrive.🤞

Awesome super-cuteness!! Def a perfect fit for the car’s personality. Will get you all kinds of attention from the younger crowd. So jealous

One consideration is sidewall profile - it’s why putting a wider tire on the same size rim doesn’t always improve handling. There are a fair number of tests that show handling improvements for narrower tires that are better matched to the rim width. A 245 tire will almost always perform better on an 8.5 inch wide rim, than it would on an 8 inch. YMMV

 

All this mention of custom wheels what are the weights?

 

Since mine are custom the manufacturer doesn't have the weights yet. I'll weigh them when I receive them... Prob heavier than stock 😂

 

Rolling my own . Using Alligator Sens.it RS+ I programmed using their ATV-41 programming tool. Alligator is the OEM for GTs, and they have been super helpful in making sure everything works.

If anyone needs a set, let me know.

 

Ooh I'll need a set!

 

Ok so rims are done... Just have to wait on shipping and hopefully no Tarriffs! 😂 🙏🏻

 

Wheels are still not done... The wheel designer contacted me and after running the wheels through FEA (Finite Element Analysis) over 30 times (!) there were some issues with potential stress damage on the spokes under heavy shifts in force (like track use but daily use would've been fine) so they have to redesign them and strengthen those areas. The high offsets and requirements for caliper clearance made the design slightly compromised. I'm glad they are doing all this to ensure the wheels hold up to any stress I can put them through (though I'm not really a track guy per se).

Really impressed with their diligence. And for the price, I wouldn't have expected all this attention. So big props to LaForge Industries!

 

Wow. I'm glad they're doing this. This is my major concern for aftermarket wheels for our cars.

 

They did. They sent me pics of the areas and the issues they found in the analysis. Beyond my intelligence for sure 😂 but they were pretty communicative about it.

 

Cool! Would love to see those…