Pls Help Me Drop Down To 17's - Hyundai Genesis Forum
 
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post #1 of 14 Old 04-22-2019 Thread Starter
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Pls Help Me Drop Down To 17's

....So I decided to kill 2 birds with 1 stone. I am changing out my rims very soon. I was going to stay with the stock 18 size diameter...but i also want to gear the rear end to 3.91. I recall seeing on this forum that going from 18's to 17's and keeping the same profile (45's) is the same as dropping the gearing from 354 to 391.
...My coupe is the 2010 base 3.8 6 speed ( NON brembos). If I order a set of 17's with the identical specs as my stock 18's...that's 5x143...67.1 center bore ect..will it be an easy swap? I am also going with lighter rims. I was in touch with an online rim outlet and at first I was told it's an easy change...but then I got the impression i might have problems??
Thanks
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....So I decided to kill 2 birds with 1 stone. I am changing out my rims very soon. I was going to stay with the stock 18 size diameter...but i also want to gear the rear end to 3.91. I recall seeing on this forum that going from 18's to 17's and keeping the same profile (45's) is the same as dropping the gearing from 354 to 391.
...My coupe is the 2010 base 3.8 6 speed ( NON brembos). If I order a set of 17's with the identical specs as my stock 18's...that's 5x143...67.1 center bore ect..will it be an easy swap? I am also going with lighter rims. I was in touch with an online rim outlet and at first I was told it's an easy change...but then I got the impression i might have problems??
Thanks
If you go with alloy wheels, it's hit or miss, as the clearances with the rim and the calipers are pretty tight with 17"
If you go with a lower offset, it should clear, but no guarantee.

I have 17" steal rims for my winter wheels and they clear fine. The problem going this route with the same ratio tires, is the car will sit lower, making it harder to get a jack under it.
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Originally Posted by Genesis306 View Post
....So I decided to kill 2 birds with 1 stone. I am changing out my rims very soon. I was going to stay with the stock 18 size diameter...but i also want to gear the rear end to 3.91. I recall seeing on this forum that going from 18's to 17's and keeping the same profile (45's) is the same as dropping the gearing from 354 to 391.
...My coupe is the 2010 base 3.8 6 speed ( NON brembos). If I order a set of 17's with the identical specs as my stock 18's...that's 5x143...67.1 center bore ect..will it be an easy swap? I am also going with lighter rims. I was in touch with an online rim outlet and at first I was told it's an easy change...but then I got the impression i might have problems??
Thanks
If you go with alloy wheels, it's hit or miss, as the clearances with the rim and the calipers are pretty tight with 17"
If you go with a lower offset, it should clear, but no guarantee.

I have 17" steal rims for my winter wheels and they clear fine. The problem going this route with the same ratio tires, is the car will sit lower, making it harder to get a jack under it.
Offset stock is supposed to be 33. The differwnt rims I'm looking at have an offset of 38-45. When you say " lower " is that below 33 or above?
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Offset stock is supposed to be 33. The differwnt rims I'm looking at have an offset of 38-45. When you say " lower " is that below 33 or above?
Yes. 0 offset would mean the hub face meeting directly in the middle of the rim.



So 33 offset means 33mm in the direction of the first example.
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I have read that brembo brakes can cause problems with going to a smaller rim. Right now with the 18's I have 1.25" of clearance between the outside of the brake caliper and the rim.
...All I was going to do is pick a 18" rim with say a 40 offset that is guaranteed to fit my coupe...and find the exact same rim in a 17" with also a 40 offset and bolt it up.
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I have read that brembo brakes can cause problems with going to a smaller rim. Right now with the 18's I have 1.25" of clearance between the outside of the brake caliper and the rim.
...All I was going to do is pick a 18" rim with say a 40 offset that is guaranteed to fit my coupe...and find the exact same rim in a 17" with also a 40 offset and bolt it up.
Did you take into account the clearance with the spokes?

Most people go the other direction for offset. IIRC 25 offset.
If you go too positive with the offset, then you'll have issues with back rim lip rubbing against the strut/spring.
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Lowest offset I can find in an aftermarket alloy rim is 35. My stock 18's are supposed to be 33. Going to do a lot of searching on the net to see who has done this on 17 alloys...not winter rims and not mustang rims etc.
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Xxr 527..17x8.25... 25 offset
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Xxr 527..17x8.25... 25 offset
Another reason why I went with steel wheels is, they are way lighter than most ally wheels of the same size.
This will do a lot more than going down in wheel size.
If I had to guess, mine are 10~15 pounds each without tires.
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Interesting about the steel wheels...I found a few alloys that are priced quite well and come in at about 18lbs
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Xxr 527..17x8.25... 25 offset
Another reason why I went with steel wheels is, they are way lighter than most ally wheels of the same size.
This will do a lot more than going down in wheel size.
If I had to guess, mine are 10~15 pounds each without tires.
10-15 lbs?...you got a pic....brand ect. 10 lbs is about 16 lbs lighter than the stock 28" rims
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10-15 lbs?...you got a pic....brand ect. 10 lbs is about 16 lbs lighter than the stock 28" rims
Sorry, they're in storage now and I don't have any good photos of them. After 9 years, they are pretty rusty (surface rust, and only used in winter). Probably gonna unmount the tires, have them blasted and repaint them.

IIRC they are just dorman wheels.
Keep in mind, A majority of them are way positive offset. So depending on how wide you go, you are going to have to get spacers just to things don't rub.
I believe my are 8" wide, but it's been 9 years since I checked the size.

If I had to do it again, I would get 18x8 steel wheels (the shop only had 17s at the time)
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I sent a message to discount tire and got a reply within a few hours. They have a sub listing for my base coupe using 17" rims! There is like 143 rims in 17" that will work.
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