Results 1 to 10 of 11
Thread: New 20's rough ride question
07-28-2009, 09:34 PM #1
New 20's rough ride question
What air pressure are you guys running in your 20" tires. Shop that mounted the tires recommended 42psi but ride seems a little rough to me. Tires are 275-55-20 so I still have about the same sidewall as the stock tires.Truck is an '07 silverado classic,reg cab,8' bed
Last edited by hunky; 07-28-2009 at 09:51 PM.
07-28-2009, 09:42 PM #2
What kind of truck, and what are your sidewall numbers? xx lbs at xx max psi.When you hear hoofbeats, look for horses not zebras.
07-28-2009, 09:59 PM #3
im guessing the truck came with 17's, and you went to a bigger rim, and kept the original tire diameter?
07-29-2009, 08:03 AM #4
I have 275/55R20's and I run mine at 34 in front and 32 in the rear. It rides much smoother than when the pressures are higher.
07-29-2009, 09:40 AM #5
Actually you have less side wall than stock tires. 275/55/20 is 31.9 inches tall, 265/70/17(stock tire on my Z71) is 31.7 inches tall. The height is the same but the difference in wheel diameter means your sidewalls are 1.5 inches smaller, which will give a slightly stiffer ride because there is less "cushion", you can try airing them down but I would watch them very closely for uneven wear.Adam
07-29-2009, 12:29 PM #6
the silverado ss tire pressure on the door says 34. they come equipped with the same size tire.
07-29-2009, 12:36 PM #7
07-29-2009, 08:39 PM #8
you should go what off what your doorjam sticker says which is proalby 35 psi even tho you changed rim size you dont wanna change your air pressure
07-30-2009, 04:14 PM #9
- Join Date
- Apr 2009
- Fresno California
- Blog Entries
of course its going to be a rougher ride you went to a bigger sized rim, with less side wall for cushion.2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
Future Mods: 6.0 LQ4/9| Bags|
07-30-2009, 05:23 PM #10
Dropped the air pressure 6psi,down to 36 and took it for a ride. Big diffrence,still " stiff" but not like riding on wooden wheels like before. I'll keep an eye on tire ware just in case.
By DSpivey in forum Lifted & Offroad SuspensionReplies: 9Last Post: 05-21-2010, 07:55 PM
By bowwow in forum Chevy Silverado Forum (GMC Sierra)Replies: 15Last Post: 08-25-2009, 01:26 PM
By will454 in forum Lifted & Offroad SuspensionReplies: 7Last Post: 04-02-2009, 10:02 AM
By bsparky in forum Lifted & Offroad SuspensionReplies: 7Last Post: 07-08-2008, 02:11 PM
By billy in forum Chevy Silverado Forum (GMC Sierra)Replies: 5Last Post: 04-29-2007, 11:16 PM