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Wider tyres or Spacers on CX-5 AWD Auto

  #1  
Old 03-17-2019, 05:46 AM
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Default Wider tyres or Spacers on CX-5 AWD Auto

Hi There

Anyone can give me the gear ratios for the 2015 CX-5 2.2 Diesel Auto Akera in South Africa.

The below are for the US version.

SIG/GTR CX5:

GEAR RATIOS (:1) Automatic transmission
1st 3.487
2nd 1.992
3rd 1.449
4th 1.000
5th 0.707
6th 0.600
Reverse 3.990
Final Drive 4.411
Tire diameter 28.7"


rpm at 70, based on this data: 2177

Reason me asking is to work out the gear ratios if i decide to change tyre size from 225/55/19 to 245/50/19 or 255/50/19.
I want to see how much impact there will be on the gearbox and how much it will be out. I know the cx-5 has the following wheel spec,

225x55x19
ET 50
114.3 with a 7J rim size

I was also thinking of using 30mm spacers at rear and 25mm in front.

What are the pros and cons for broader tyres and spacers.
Would really appreciate your feedback on your own experiences or know of people that used those setups.
 
  #2  
Old 03-17-2019, 06:21 AM
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Factory Specs 225/55R19 Diameter 28.74" Width 8.86" Sidewall 4.87" Circum 90.30" Revs/Mile 723.63

Below is size options & difference in %. Going any wider than 225 & you would want to replace your factory rims with something wider.

Size- Min Rim - Max Rim - Overall diameter - Difference
285/40R19 9.50in 11.00in 27.98" -2.67%
255/45R19 8.00in 9.50in 28.04" -2.47%
235/50R19 6.50in 8.50in 28.25" -1.71%
295/40R19 --0.00in 0.00in 28.29" -1.58%
265/45R19 --0.00in 0.00in 28.39" -1.23%
345/35R19 11.50in 13.50in 28.51" -0.82%
245/50R19 7.00in 8.50in 28.65" -0.34%
275/45R19 8.50in 10.50in 28.74" Equal
315/40R19 11.00in 12.00in 28.92" 0.62%
255/50R19 7.00in 9.00in 29.04" 1.03%
285/45R19 9.00in 10.50in 29.10" 1.23%
235/55R19 6.50in 8.50in 29.18" 1.51%
265/50R19 7.50in 9.50in 29.43" 2.40%
295/45R19 9.50in11.00in29.45" 2.47%
 
  #3  
Old 03-17-2019, 08:15 AM
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Originally Posted by grim_reaper View Post
Factory Specs 225/55R19 Diameter 28.74" Width 8.86" Sidewall 4.87" Circum 90.30" Revs/Mile 723.63

Below is size options & difference in %. Going any wider than 225 & you would want to replace your factory rims with something wider.

Size- Min Rim - Max Rim - Overall diameter - Difference
285/40R19 9.50in 11.00in 27.98" -2.67%
255/45R19 8.00in 9.50in 28.04" -2.47%
235/50R19 6.50in 8.50in 28.25" -1.71%
295/40R19 --0.00in 0.00in 28.29" -1.58%
265/45R19 --0.00in 0.00in 28.39" -1.23%
345/35R19 11.50in 13.50in 28.51" -0.82%
245/50R19 7.00in 8.50in 28.65" -0.34%
275/45R19 8.50in 10.50in 28.74" Equal
315/40R19 11.00in 12.00in 28.92" 0.62%
255/50R19 7.00in 9.00in 29.04" 1.03%
285/45R19 9.00in 10.50in 29.10" 1.23%
235/55R19 6.50in 8.50in 29.18" 1.51%
265/50R19 7.50in 9.50in 29.43" 2.40%
295/45R19 9.50in11.00in29.45" 2.47%
thank you for your input and size differences. I would want to stay stock as I really like the rim. May I ask why I would need to change to bigger rims if I go wider then 225?

what about using 235/55/19 as it's only 10mm wider and out by 1.51%? Then I can put 20mm or 30mm spacers on to improve the look.

Will the wider cause gearbox issues at all?
 
  #4  
Old 03-18-2019, 03:59 AM
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For every inch of rim width there is a optimal tyre width to match it. Too wider rim & you stretch the tyre too far, too narrow & the tyre mushrooms.

Going to 235/55/19 will make you go slower by 1.5 km/hr when your speedo reads 100km/hr vs your factory tyres.

Fitting spacers moves the distribution of load on the hub, causing extra stress on the hub,bearing & suspension. It is not recommended.
 
  #5  
Old 03-18-2019, 01:50 PM
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Originally Posted by grim_reaper View Post
For every inch of rim width there is a optimal tyre width to match it. Too wider rim & you stretch the tyre too far, too narrow & the tyre mushrooms.

Going to 235/55/19 will make you go slower by 1.5 km/hr when your speedo reads 100km/hr vs your factory tyres.

Fitting spacers moves the distribution of load on the hub, causing extra stress on the hub,bearing & suspension. It is not recommended.
im not too worried about the speedometer reading and slightly wider tyre. All I want to know is if it will have any issues on the gearbox at all. Was not aware of this until someone told me about it.
 
  #6  
Old 03-19-2019, 03:10 AM
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As long as all 4 tyres are the same, tread, size & design you will be ok.
 
  #7  
Old 04-03-2019, 07:27 AM
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I've been down a long road on this subject. Short version is this: wider tyres are great for cornering due to the extra grip but will have a big effect on acceleration and fuel economy. Spacers are a way of keep the performance in spec and will give you the cornering benefits from a longer axis; but for anything over 5mm, go hub-centric when it comes to spacers to protect your hub. You should also factor in the maximum drop because the crunch sound when hitting a dip in the road will make you cringe.

When it comes to tyres, having them slightly stretched keeps them legal, tucks them under the arch a little more and they look really cool. On my old coupe, I had 8J with 215 and 9J with 225 and found they looked great. Willtheyfit.com has a cool feature of showing the angles of different stretched tyres so you can pick what you like. Be aware that MOT rules give garages the right to declare over-stretched tyres unsafe for the road if you get carried away.
 
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