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BDS 4” kit & tire

Anakalypto
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Anakalypto Enthusiast

Anakalypto

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Got a 4” BDS kit on the way for my 2019 Sierra SLT. Going to run 35x12.50s on my stock 20” snow flake style wheels. Running a hybrid tire that true size will be about 34.75” x 12.52”.

 

Question is this: what size wheel spacers could I try? Going to toy with them before I switch wheels. Always been a fan of the stock ones.

 

Since I’m only on a 4” lift instead of 6”, I know I need to be careful with any offset as that’s where all my clearance issues will be.

 

I see guys running this tire size on some leveled GMCs with trimming (I’m happy to do some trimming too).

 

Could I get away with a 25mm spacer making the offset almost 0?

 

Curious to hear some opinions, TIA

 

 

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Ianwelch001 Enthusiast

Ianwelch001

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Got a 4” BDS kit on the way for my 2019 Sierra SLT. Going to run 35x12.50s on my stock 20” snow flake style wheels. Running a hybrid tire that true size will be about 34.75” x 12.52”.
 
Question is this: what size wheel spacers could I try? Going to toy with them before I switch wheels. Always been a fan of the stock ones.
 
Since I’m only on a 4” lift instead of 6”, I know I need to be careful with any offset as that’s where all my clearance issues will be.
 
I see guys running this tire size on some leveled GMCs with trimming (I’m happy to do some trimming too).
 
Could I get away with a 25mm spacer making the offset almost 0?
 
Curious to hear some opinions, TIA
 
 
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A 0 offset will be too much without trimming. I believe I have seen people here run 1/4 inch spacers roughly 7mm and able to clear 12.50s. Its not much and won't have your tires flush with the body but will prevent you from having to trim too much.
I've seen guys run stock lugs with the 1/4 spacer but you lose a few threads. I personally would order new studs 1/4 inch longer

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Ianwelch001 Enthusiast

Ianwelch001

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Also the BDS and zone 4" kits will push the front wheels out with the new spindles anywhere from 1 to 2"s on each side depending on who you ask.

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Anakalypto Enthusiast

Anakalypto

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A 0 offset will be too much without trimming. I believe I have seen people here run 1/4 inch spacers roughly 7mm and able to clear 12.50s. Its not much and won't have your tires flush with the body but will prevent you from having to trim too much.
I've seen guys run stock lugs with the 1/4 spacer but you lose a few threads. I personally would order new studs 1/4 inch longer

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Any idea how much I’d need to trim at a 0? If it’s just plastic on the flaps and bumper and pulling the fender well carpet back with a zip tie I’m not worried about it. Would prefer to stay out of the metal on the bumper though.

Good point on the new spindles increasing track width, forgot that. Makes sense now why I see guys running small spacers up front but 1” or 1.25” rear.


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Ianwelch001 Enthusiast

Ianwelch001

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Any idea how much I’d need to trim at a 0? If it’s just plastic on the flaps and bumper and pulling the fender well carpet back with a zip tie I’m not worried about it. Would prefer to stay out of the metal on the bumper though.

Good point on the new spindles increasing track width, forgot that. Makes sense now why I see guys running small spacers up front but 1” or 1.25” rear.


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You shouldn't have to run spacers up front because the lift kit is already pushing the wheels out. I've seen some people say it pushed it out between 1 to 2 inches so you shouldn't rub on the UCA. I'm guessing with a 12.5 wide and being a gmc with the squared wheel wells, you will probably have to trim the plastic and remove the metal bracket behind the front wheel wells that hold the mud mudflap on. I cant see you having to cut the bumper though.

So you may want to install those and see how much it pushes the wheels out then order spacers for the rear to match the front track. My guess is you'll need 1.5" spacers for the back

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