21/22’s & Seatbelt

The 21/22 combo will ride harsher, and obviously rim damage is more of an issue. It's not something you do for performance gains, you do it because you like the looks. It slows the car down and it will not perform as good as a car with 20" wheels. That's just how it is.

For the seatbelt try the following. Pull the seatbelt all the way out and clean it with water and soap. Some use a bit a dishwashing soap, some a bit of soap for washing clothes. Anyhow, give the seatbelts a good washing and see if that helps. Make sure you keep them out till they are fully dry. Just use a clothes pin or similar to keep the belt from retracting while you are cleaning it. More often than not, issues with seatbelts not retracting properly is due to dirty seatbelts. There can be another cause, but start there as it's a very common remedy.

 

I had this setup and it definitely rides harsher and there is a greater risk of damage from hitting a pothole. There will also be some performance degradation. Also be aware that if your car is at all prone to creaks/rattles, this configuration will exacerbate things. It did with my 458 Italia. I have since sold my 458 and am waiting for an F8 to arrive. I'll likely keep my wheels stock this time. I personally won't upsize to 22s again. I'm running 20/21 on my Huracan.

You may want to consider 20/21 instead.

 

They will. Fit 245/35R20 and 305/35R20 tyres on them.

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I am not a fan of the look of real skinny profile tires like 21/22 combo. The look to me is fragile I guess is the best word I can think of.

Also there is a lot said for the better handling and ride of the stock sizes as that is what the car was designed for. I prefer the stock 20" sizes with more meat on the tire. Here is my car with HRE stock sizes just less offset to push the wheel out a few mm's. It's all personal choice so do what you like best.
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20 - 21 will allow a larger tire profile thus a better ride. Image Unavailable, Please Login

 

245/35/20 325/30/21

 

The two choices to use for a 20/21 combo is the following.

245/35R20 - 305/30R21

255/35R20 - 315/30R21

From a performance standpoint, I like the latter. 9.5x20 ET38 rims front and 11.5x21 ET29.

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I'm not trying to start an argument I'm asking for educational purposes. Why have you listed the sizes you did?

 

Fair question.

If I myself want a set of aftermarket wheels and tyres, or suggest them to others, I want something that either performs on the same level or better than stock.

The latter suggestion I made, is based off of the idea of giving a wee bit more front end grip. This is because these 20/21 and especially 21/22 setups tend to increase understeer. This can be an issue as understeer is,already an issue in stock form. I choose,the 255 MPS4S specifically because tread width is only 0.1" wider than that found on the stock MPSS K3. The K3 MPSS feature an 8.8" tread width and the 255/35R20 MPS4S has an 8.9" tread. By comparison, the 245 section MPS4S tread is only 8.4" wide. In other words, the MPS4S run a bit narrow. The stock rear 305 has a tread width of 11.1", so the 315 MPS4S which is 11.2" is a good choice.

I suggest the wheel size for a multitude of reasons. The reason behind the 9.5" wide front is to add a bit of stretch to the tyre. This is not done just to look cool. This is done because the MPS4S has a softer sidewall that the older MPSS it replaces. Using a 9.5" wheel as opposed to a 9", stiffen up the sidewall a bit.

The same principle is the reason for the width of the rear wheel.

But it does not end there. I choose the offset for two reasons. I choose the offsets because in conjunction with the 0 5" wider rims, the rum lip is placed in about the same location in relation to the fenders as if a set of 14/18 mm Capristo wheel spacers were used with the stock wheels. My experience is that this is a good "flush" look. More importantly, I choose these offsets because they have less of a negative impact on especially steering geometry than that of a lower offset. So by using the 0.5" wider wheels, you get a nice flush look, without the negative effects of a super aggressive offset change.

Lastly the 38 mm front offset allows for lowering should one choose to do so, without the tyre rubbing on the rear part of the liner when turning. I've seen a few cars that were lowered with the 255 setup and ET 35 which had rubbing issues once they got lowered. When lowering, you have to factor in that the caster moves the wheel slightly more rearward in the wheel well the more you lower it.

So that's my thoughts behind the suggestions.

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