Wheel Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HoupPhotography · 05-02-2008, 12:55 AM

I have 20" wheels with 50 series tires on my truck now, how much will the truck drop when I put a 15" wheel on with a 4" white wall (I don't know what sidewall heighth those have)

**Palf70Step** · 05-02-2008, 02:18 AM

Use this and put in the size tire you currently have and then the new size or sizes you want to run. Figure the difference in height and 1/2 the difference of the two is how much drop you'll see. Again, this is approximately

http://www.1010tires.com/TireSizeCalculator.asp

Example

255/50x20 = 30" tall
255/70x15 = 29" tall
235/75x15 = 28.9" tall

265/70x17 = 31.6" tall
275/55x20 = 31.9 " tall

So going from a 20 to a 15 you might only drop a 1/2"depending on the size/profile tire.

HoupPhotography · 05-02-2008, 05:07 AM

I'm going from a 275\55R\20 to a 215\70R15 my truck will drop about 5inches.... am I reading that right?

The overall diameter is going from 31.90 to 26.85

67_C-30 · 05-02-2008, 05:30 AM

Quote:

Originally Posted by HoupPhotography

I'm going from a 27555R20 to a 21570R15 my truck will drop about 5inches.... am I reading that right?

The overall diameter is going from 31.90 to 26.85

No, it will be a 2.525" drop because you have to divide the diameter by 2 to get the distance from the center of the hub to the ground.

05-02-2008, 12:55 AM	#1
HoupPhotography Registered User Join Date: Feb 2008 Location: Phoenix, Az Posts: 1,204	Wheel Question I have 20" wheels with 50 series tires on my truck now, how much will the truck drop when I put a 15" wheel on with a 4" white wall (I don't know what sidewall heighth those have) __________________ R.I.P. Scott Kalitta

05-02-2008, 02:18 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,082	Re: Wheel Question Use this and put in the size tire you currently have and then the new size or sizes you want to run. Figure the difference in height and 1/2 the difference of the two is how much drop you'll see. Again, this is approximately http://www.1010tires.com/TireSizeCalculator.asp Example 255/50x20 = 30" tall 255/70x15 = 29" tall 235/75x15 = 28.9" tall 265/70x17 = 31.6" tall 275/55x20 = 31.9 " tall So going from a 20 to a 15 you might only drop a 1/2"depending on the size/profile tire. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! Last edited by Palf70Step; 05-02-2008 at 02:18 AM.

05-02-2008, 05:07 AM	#3
HoupPhotography Registered User Join Date: Feb 2008 Location: Phoenix, Az Posts: 1,204	Re: Wheel Question I'm going from a 275\55R\20 to a 215\70R15 my truck will drop about 5inches.... am I reading that right? The overall diameter is going from 31.90 to 26.85 __________________ R.I.P. Scott Kalitta

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