I want to put 25mm [1"] spacers on my front wheels of my GT conversion to bring the wheels out a bit further,if i were to put these on what if any problems could this cause to the car
Thanks Brian

Guess it largely depends on the rims / offset you are running

GT spares list - Not sure why two part numbers for the 21mm, difference in the 6 or 7" rim? I'm not too good on the SWB 911 parts

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No real problems if you choose a good spacer,I prefer H&R brand because they fit properly,end of story,you just don't cheap on parts like this,these are not cheap.
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Check your wheel bearing before fitting and torque them correctly to the hub,you will be good.

Four lug or five ? If you have a 5-stud conversion, you can use longer studs in the rotors & 1" slip over spacers. Not sure of supplier of spacers, but T3 Technique in Redmond, Wa has amazing supplies of wheel studs, bolts. 425.836.5983.
Best wishes... Terry

Spacers on the front change the scrub radius. It will make it harder to steer at slow speeds and affect the high speed turning and centering slightly.

Google scrub radius for more info.

As an engineer the concept of studs that long concerns me,but that just me,I know people on here have done it and Porsche did it on the early 944 with the spacer they used in the rear of those cars.
The 30mm H&R one I showed is actually a spacer adaptor,I prefer this type of design for the thicker spacers.

Those are also illegal in most (if not all) racing organizations. Probably fine for street driving though.

I have 100mm wheel studs on all 4 corners on my car with no ill effects.
The long studs allow me to quickly change wheels and spacers of various sizes.

A friend of mine races his Cobra with 3” of spacers over extra long studs. Passes tech and no issues.

Andy, is that the total length of your wheel studs or the exposed length only?

What exactly are they going onto? 911 aluminum hubs?
From what I have seen Porsche only uses up to 19mm spacers with 65mm studs on spacers. With thicker spacers they go to the bolt on adapters. Consider if 19mm 944 spacers and studs will work. I have a set if you are interested.

Drive a car with the increased scrub radius before spending the money - it’s not that much fun. Even the difference between 7” and the original 5 1/2” wheels is noticeable between my 914-6 and my GT flared conversion.

From the flared cars I've driven, it makes the steering harder, but it's not bad unless you have girl muscles.

Are you sure? The wording that I remember is "spacer that changes the bolt pattern". Spacers similar to the one above were used on the early 930s; hopefully those weren't problematic...

--DD

I prefer this type (which require longer lug studs), they are from the 944 and readily available

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The way i have always seen it worded is that any bolt on spacer is not permitted and i have actually never seen bolt on spacers that did *not* change the bolt pattern.

The ones shown above don't change it--it's still 5x130mm. They do rotate the pattern, of course...

--DD

Yeh... I told my wife that she's has been driving my 914 too much lately.

see no issue,extended studs well that's a risk the owner takes,people buy by cost on these ....price out genuine and see.
The spacer I showed would be fine for the OP cause he won't need extended studs.

How do they affect high speed turning? More twitchy or less responsive?

She been working that hard on her kegels too?