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  #1  
Old 08-27-2013, 08:34 PM
craig14 craig14 is offline
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Default 37" Bfg km2's on stock wheels what size spacer

Hey new to this forum, Just installed a 6" rcx lift and have 37x1250x20's want to put these on stock rims, what size spacer will i need, some say 1/4" and some say 1.5". I'll be getting them from motorsport tech, eventually going to buy a set of new wheels, just want to get them on the truck.
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Old 08-27-2013, 10:30 PM
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Stock rims are +19mm offset. Most guys are running at least a zero offset aftermarket rim. So for appearance I would go for at least a half inch spacer. The stock tires are 33 inches high and over ten inches wide. So given that you are only going up in size by four inches, you don't need to worry about top clearance. Only inside clearance. Only half of the increase in width is an issue. So the most you would need is an inch and a quarter to have the same clearance you have now. But you'll only rub on the inside at full lock so a quarter inch spacer will suffice. But I would get a half inch spacer anyway to be sure.
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Old 08-27-2013, 10:48 PM
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Thanks for the reply, will i have enough thread on my studs for a half inch spacer? or should i get the adapters? I really dont want to cut my studs seeing as ill be running a new set of wheels this comming spring.
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Old 08-28-2013, 12:44 AM
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You'll want the adapters.
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Old 08-28-2013, 07:39 PM
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Agreed. Adapters are the way to go.
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Old 08-29-2013, 04:12 PM
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1/4" is all you need and only due to the width of the tire. If it's just temporary I'd go with the spacer to save a little money.
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Old 08-29-2013, 05:26 PM
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Let us know if you need help tracking down some adapters.
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Old 08-30-2013, 08:38 AM
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Quote:
Originally Posted by craig14 View Post
Hey new to this forum, Just installed a 6" rcx lift and have 37x1250x20's want to put these on stock rims, what size spacer will i need, some say 1/4" and some say 1.5". I'll be getting them from motorsport tech, eventually going to buy a set of new wheels, just want to get them on the truck.
I don't know how valid this is but I am running 33x12.5 on the stock 20's, no spacer and no lift. I have about 1/4" of space in-between the suspension arm and the inside of the tire. I don't know if the added diameter would cause the tire to rub at full lock though.

You may not need a spacer at all. Spacers are nothing more than a bandaid fix so if you can get away with it, I would not use one unless I had to.

I have always had one tire mounted on the wheel, mounted the wheel on the vehicle, and then test fit it before buying aftermarket wheels and/or spacers. Sometimes you get lucky and every truck is slighly different, even if it is the 'same' truck.
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Old 09-02-2013, 12:26 PM
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Thanks for all your imput, called motorsport tech and ordered a 3/8" hub centric wheel centric spacer, have yet to get them but have so far received great service from them over the phone. We get some harsh winters with lots of salt and with hunting just around the corner ill wait until spring to throw on some aftermarkets.
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Old 09-02-2013, 12:29 PM
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Quote:
Originally Posted by Spike View Post
I don't know how valid this is but I am running 33x12.5 on the stock 20's, no spacer and no lift. I have about 1/4" of space in-between the suspension arm and the inside of the tire. I don't know if the added diameter would cause the tire to rub at full lock though.

You may not need a spacer at all. Spacers are nothing more than a bandaid fix so if you can get away with it, I would not use one unless I had to.

I have always had one tire mounted on the wheel, mounted the wheel on the vehicle, and then test fit it before buying aftermarket wheels and/or spacers. Sometimes you get lucky and every truck is slighly different, even if it is the 'same' truck.

Spike, Anyone feel free to chime in, but I believe your tires fit because of the fact your truck isn't lifted. the stock knuckles sit in further then that off rough country's, my stock tire is fairly close to my knuckle now therefore i needed a spacer. Thanks for that post though!
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