Suspension Is your ride slammed to the ground? Did you lift it so high you need a ladder to get in? Step in and let's talk about it.

Larger tires onCx-9 20"

  #1  
Old 06-05-2015, 05:09 PM
Junior Member
Thread Starter
Join Date: Oct 2014
Posts: 6
Default Larger tires onCx-9 20"

What's the tallest tire that would work well , stock is 245/50
 
  #2  
Old 06-05-2015, 05:54 PM
Banned
Join Date: Dec 2011
Location: Canada
Posts: 2,636
Default

Without screwing up the speedometer, ecu or brake issues?
When changing tire sizes, we recommend staying within 3% of the diameter/height of the original tire. Any more than this and you face the risk of brake failure. FROM: Tire Size Calculator - tire & wheel plus sizing

Read: https://www.mazdaforum.com/forum/whe...ensions-30376/

and: Tire Size Calculator - Tire & Wheel Plus Sizing
 
  #3  
Old 06-05-2015, 07:27 PM
Junior Member
Thread Starter
Join Date: Oct 2014
Posts: 6
Default tire

so what size ( tallest ) would be the max that's safe ?? Thanks
 

Last edited by Taz 454; 06-05-2015 at 07:39 PM.
  #4  
Old 06-05-2015, 07:47 PM
Banned
Join Date: Dec 2011
Location: Canada
Posts: 2,636
Default

Originally Posted by Taz 454 View Post
so what size ( tallest ) would be the max that's safe ?? Thanks
I may be good at math, but really! Do the calculation yourself, you have your tire size (or go outside and read it), add 3 %, use link given.
Explore tire sites for sizes.
 
  #5  
Old 12-01-2015, 09:45 AM
virgin1's Avatar
Super Moderator
Join Date: Mar 2007
Location: Manor, TX (Outside of Austin)
Posts: 8,660
Default


In other words, nothing bigger than a 255/45 width. I am assuming you are running 19's now?
Looking again, and still assuming the 19" OE wheel size, a 265/45 would work also, but will be 2.6% TALLER than OE. In other words your speedometer reading will be low by approx 2mph @ 65 mph indicated, but by more the faster you drive.
275/40-20" is the closest match I can find in a plus 1 sizing. They're about as perfect in diameter and circumference as you will find.
The question is, do you have the wheels (width,) backspacing/offset and fender lip clearance for such a monster? Also when approaching the subject of offset, remember too that moving the center of the wheel too far one way or the other (out, or in) will increase the steering scrub angle and affect the entire steering geometry, as well as putting additional weight on components like wheel bearings, causing them to wear faster, and potentially more dangerous handling.
Also remember please that the bigger the wheel/tire combo, the heavier it will be (unsprung weight.) This has negative affects on braking and handling as well as with fuel mileage and wear items. Wider tires with a shorter sidewall will also reduce the ride quality.
 

Last edited by virgin1; 12-01-2015 at 10:05 AM.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
doctor15
Mazda CX-5
8
11-13-2013 12:12 PM
KB3
Mazda Tribute
5
10-11-2012 12:03 AM
Baston-Rob
Mazda6
2
02-17-2011 04:20 AM
mx5mke
Mazda3
20
10-25-2009 11:11 AM


Thread Tools
Search this Thread
Quick Reply: Larger tires onCx-9 20"


Advertising
Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.