[T&PBMW]

Hi everyone,

I spent quite a bit of time researching the proper fitment for the G29 including information found here on this site. Here is a breakdown of what I learned, used and why.

The number one takeaway is you can fit a more aggressive offset than anticipated. In the past I read that the clearance was as follows:

Front: 8mm from fender
Rear: 12.5mm from fender

For myself, this was not the case. Using a level, I got the following dimensions measured from the top of the rim, flush to the fender.

Front: 13mm from fender
Rear: 19mm from fender

The stock wheels that came with the car were:

255/40/18 et32, 95Y (661mm diameter)
275/40/18 et40, 99Y (677mm diameter)

I was concerned about going to 20” wheels because of the fronts. I did not want to drive on sidewalls less than 80mm. I have done that before and really had problems with some of our Ontario roads. Bumping up to a 265/30/20 in the front gives me basically a 80mm sidewall but I found that most reasonably priced 20’s on the market are available in 9” widths only. I did not want to put a 265 on a 9” wheel, as the largest I would do on a 9” is a 255 (just a personal preference). I have also found that the more rounded tire look up front with aggressive offsets can cause problems with rubbing, particularly at full lock (even using the same tire diameter as stock). I also find that 9" wheels have little to no concave.

As I was looking for wheels and tires the new M3/M4 was released with a double stagger, 19” in the front and 20” in the rear. The front sidewall is quite a bit bigger than the rear, which I don't particularly like but I don't mind the look of the different wheels sizes, another personal preference I guess.

What I ended up with is the following:

255/35/19 et25, 9.5” wheel in the front
285/30/20 et30, 10.5” wheel in the rear, 679mm diameter (a 275/20 has a smaller diameter than stock at 673mm)

Using these tire sizes, I was able to keep the sidewalls as close as possible between the front and rear (not noticeable). Also, going to a 9.5” wheel in the front gave me more concave than what a 9” wheel would have given me. The front is flush, anything less than a 25 offset will poke. Given that the front also has 255’s on a 9.5” wheel, there is a slight stretch to the tire, which I think, helps in this case (given I have zero rubbing on any road conditions or at full lock). The rear is still a few mm from being flush (confirming my 19mm calculation). If you are doing a custom offset, you could do an et27 in the rear (for a flush fit) using a 10.5” wheel.

The wheels are part of the flow formed series from Braelin, BR10’s. They are a Canadian company so are very reasonably priced given we don't have to pay exchanges, duty and brokerage bringing in a wheel from another country.

https://fastco.ca/Braelin/Alloy-Whee...%2B%252f%2BMAT

One thing to note, these fitments are exactly what some of the more aggressive Supras are using. We were unsure if the Supra fenders were the same but they appear to be very close in dimension given these offsets. There are not a lot of G29’s with aftermarket wheels but there is a ton of Supras you can use as a guide. For the most part, we found that the wheel fitments are the same.

In the end, I think the double stagger works well with this body design. It is not what I expected to do but it solved a lot of issues that I didn’t like. I now have a larger front sidewall, deeper front concave, flush fit with an off-the-shelf wheel and 20” in the rear, which looks way better than a 19”. As an FYI, I used Firestone Firehawk Indy 500, which are an absolute bargain. I think they make less road noise than the Michelins and perform surprisingly well. I really do not perceive any performance differences with my spirited driving. They are W rated tires but that makes no difference to me. If you really need a Y rated tire, there are several options available for these tire sizes (for a lot more money).

Next step, adjustable coilovers!

Final note: the wax sitting on top of the car in the first pic is the Limited Edition Turtle Wax 75th Anniversary Ceramic + Graphene Paste Wax. Don’t hesitate if you have a chance to try it.

[Horseman]

Beautiful pictures! Thank you for sharing!

[TAZ007]

Nice rims and stance.

[augusto_fontana]

awesome

[Designer003]

Cool!
I feel fronts got more fender to wheel space all around than rear....
Rear looks good.

[T&PBMW]

I noticed this as well even with the stock wheels and tires. I do see more space from the tire to the fender in the front on many G29's but not all of them. I wonder why? Adjustable coilovers will fix this. I would be curious to know if other owners notice the same thing.

[JustChris]

Excellent and thanks for the details.

[BMW_AL]

The car looks awesome, I really like those rims. Great info

[ToysArs]

Great post and car looks awesome. I checked the website for the wheels, there seems to be few offset choices, did you end-up doing a custom order?

Also, when you lower the car, you might be able to go even more aggressive, considering top of the wheels will tuck in.

Maybe below are the perfect setup for a lowered car for the flush look?
et22, 9.5 front, et25, 10.5 rear

[Designer003]

Originally Posted by T&PBMW

I noticed this as well even with the stock wheels and tires. I do see more space from the tire to the fender in the front on many G29's but not all of them. I wonder why? Adjustable coilovers will fix this. I would be curious to know if other owners notice the same thing.

It's common that front wheel clearance is set to be more, for when car hits bumps, or it engages hard emergency brakes.

I checked on my car pics when it was stock, and front wheels did have more wheel clearance than rear.

Also 19inch rim 35 tire will have slightly smaller overall diameter than 20 inch with 30 tire. 19 inch rim will look visually smaller than 20 inch as well.

Coilover will be helpful, but I think eventually you will switch to 20inch on the front for the beauty :P

[DM6]

Fit and finish are A+ on those wheels. Very nicely done!

That being said, I'm really digging the stock version of this vehicle. I am a habitual modder when I get my hands on a new vehicle. Not this time. Going to be a hot minute before I alter anything. Stock wheels I'm sporting are phenomenal IMO.

[monkahead]

@T&PBMW I really like your study and the pictures you posted, thank you. Funny, because I came here from Supra forum to look for the OEM suspension dimensions for my new set of summer wheels for my Supra Mk5. I already did some measurements and I'll be calculating for the flush fitment for my car now.

Regarding handling, since by changing OEM wheel size, you must have changed the "scrub radius". Has this affected ride & handling or steering wheel feedback (once going back to its 0 position after turning)?

[RavenGX]

those wheels are awesome, great choice

[monkahead]

Originally Posted by T&PBMW

For myself, this was not the case. Using a level, I got the following dimensions measured from the top of the rim, flush to the fender.

Front: 13mm from fender
Rear: 19mm from fender

The stock wheels that came with the car were:

255/40/18 et32, 95Y (661mm diameter)
275/40/18 et40, 99Y (677mm diameter)

Hello, this is a Supra driver, looking for some technical data from G29 users. I found your post very helpful, however I have a few questions. I did the same measurement on my Supra and I found out that fender to tire (not to the rim) gap is pretty much the same:

Front: 14mm from fender
Rear: 20mm from fender

I'm going to buy a set of JR SL-02 19" rims, and since they can be ordered with specific off-set values, tailored exactly to one's needs, I'd like to have the best fitment possible on these rims. Here comes the question: I see on current Hankook winter tires, that protective lip on the front tire doesn't stick out of the rim as much as on the rear one. Additionally, looks like the protective lip on summer Michelin Pilot SS (used on the same set of rims) was larger and in my opinion the size of the lip will have a direct impact on how wheel will look like on the car: fender to tire flush/no flush. Did you somehow take this into consideration when doing your calculations? I already purchased a set of GY Asymm 6 tires, OEM size, and I see they have a large protective lip, similar to Michelin's.

[tracer bullet]

If it helps, I found that you can chat online with Tire Rack and get exact dimensions of tires mounted on wheels. Maybe somewhat limited but they've got data that is useful. I found for example that a 255 width Firestone Firehawk Indy 500 tire was more than 10mm narrower than a 255 width Michelin PSS. Point being there can sometimes be even more to it than just that little bead over the wheel lip itself. Just something to consider.

[monkahead]

Originally Posted by tracer bullet

I found for example that a 255 width Firestone Firehawk Indy 500 tire was more than 10mm narrower than a 255 width Michelin PSS.

Thank you for this tip, I already assumed that. For example:

- Michelin Pilot SS 255/40/18 is in reality 268mm wide
- Michelin Pilot SS 275/40/18 is in reality 290mm wide

So track oriented tire is a bit wider than default spec.

- GY F1 Asymm 6 255/35/19 is in reality 260mm wide (new set)
- GY F1 Asymm 6 275/35/19 is in reality 280mm wide (new set)

Still slightly wider than spec, both: MPSS and GYF1A6 seem to have a large protective lip, min. 4mm high.

Now I need to measure the ones I have currently installed on my stock 18" rims, winter Hankook icept3.